| 3F Chimica Americas Inc | Water - Pretreatment ADMIN | Aberdeen | Monroe |
| A and R Land Management, LLC, Commercial Development | Water Quality - 401 Certification | Petal | Forrest |
| A and R Land Management, LLC, Commercial Development | Water Quality - 401 Certification | Petal | Forrest |
| ABB Kuhlman, Crystal Springs Plant | Air - SMOP Admin Mod | Crystal Springs | Copiah |
| AG Air LLC | Water - State Operating Permit Renewal | Scott | Bolivar |
| Adams County Water Association Inc, Foresite Subdivision | Water - NPDES Commercial Renewal | Natchez | Adams |
| Adams County Water Association Inc, Highland North Subdivision | Water - NPDES Commercial Renewal | Natchez | Adams |
| Adams County Water Association Inc, La Grange Heights Subdivision | Water - NPDES Commercial Renewal | Natchez | Adams |
| Advanced Urethane Technologies | Air - SMOP Modification | Coldwater | Tate |
| Ag Concepts Inc | Water - State Operating Permit Renewal | Itta Bena | Leflore |
| Air Worthy Inc | Water - State Operating Permit Renewal | Clarksdale | Coahoma |
| Albert W Ryals Jr, Dairy and Swine Farm | Water - State Operating Permit | Tylertown | Walthall |
| Alliance Consulting Group LLC, Picayune Frac Plant | Water Quality - 401 Certification | Picayune | Pearl River |
| Aluminum Extrusions Inc | Water - Pretreatment Renewal | Senatobia | Tate |
| American Eurocopter Corporation | Air - SMOP Renewal | Columbus | Lowndes |
| American Eurocopter Corporation | Water - Pretreatment ADMIN | Columbus | Lowndes |
| American Wood | Hazardous Waste - TSD Post-Closure Renewal | Richton | Perry |
| Americas Catch Inc | Water - NPDES Minor Industrial Renewal | Itta Bena | Leflore |
| Amite BioEnergy LLC, Wood Pellet Manufacturing Facility | Air - Construction Permit | Gloster | Amite |
| Amite County Board of Supervisors, Gloster Solid Waste Transfer Station/Waste Tire Collection Site | Solid Waste - Transfer | Gloster | Amite |
| Anguilla POTW | Water - NPDES Minor Municipal Renewal | Anguilla | Sharkey |
| Arrington Place Apartments | Water - State Operating Permit Renewal | Hattiesburg | Forrest |
| Ascent Hospitality Management Company, LLC, Anchor Development | Water Quality - 401 Certification | Gulfport | Harrison |
| Ashland POTW, East | Water - NPDES Minor Municipal Renewal | Ashland | Benton |
| Atlas Roofing Corporation | Air - Title V Renewal | Meridian | Lauderdale |
| Atlas Roofing Corporation | Water - NPDES Minor Industrial Admin Mod | Meridian | Lauderdale |
| Attala Steel Industries LLC | Air - Construction Permit | Kosciusko | Attala |
| Avon Engineered Fabrications Inc | Air - Title V Admin Mod | Picayune | Pearl River |
| Axiall LLC | Water - NPDES Minor Industrial Admin Mod | Hazlehurst | Copiah |
| Axiall LLC | Water - Pretreatment ADMIN | Aberdeen | Monroe |
| Axiall LLC | Air - Title V Admin Mod | Aberdeen | Monroe |
| BACCO Materials Inc, Air Base Plant | Water - State Operating Permit | Columbus | Lowndes |
| BASF Corporation | Water - State Operating Permit Renewal | Jackson | Hinds |
| BFI Waste Systems of Mississippi LLC, Little Dixie Landfill | Water - Pretreatment Modification | Ridgeland | Madison |
| BT Picayune Associates, LLC, Tractor Supply Company | Water Quality - 401 Certification | Picayune | Pearl River |
| BT Picayune Associates, LLC, Tractor Supply Company | Water Quality - 401 Certification | Picayune | Pearl River |
| Babcock and Wilcox Power Generation Group Inc | Air - SMOP Renewal | West Point | Clay |
| Babcock and Wilcox Power Generation Group Inc | Water - NPDES Storm Admin Mod | West Point | Clay |
| Baldwyn POTW | Water - NPDES Minor Municipal Renewal | Baldwyn | Lee |
| Baymont Inc | Air - Title V Renewal | Golden | Tishomingo |
| Bea Dor Partners, High Forest Subdivision | Water - NPDES Commercial Renewal | Tupelo | Lee |
| Belmont Fiberglass Inc | Air - SMOP Renewal | Belmont | Tishomingo |
| Belzoni POTW | Water - NPDES Major Municipal Renewal | Belzoni | Humphreys |
| Benny Borst, Dairy | Water - State Operating Permit Renewal | Cedar Bluff | Clay |
| Benoit POTW | Water - NPDES Minor Municipal Renewal | Benoit | Bolivar |
| Bent Creek Utility Inc, Bent Creek Lagoon | Water - NPDES Commercial Renewal | Hattiesburg | Lamar |
| Best Foam Inc | Air - SMOP Renewal | Sherman | Pontotoc |
| Bethel Temple Pentecostal Church Inc | Water - State Operating Permit Renewal | Brookhaven | Lincoln |
| Betterfly Inc | Water - State Operating Permit Renewal | Indianola | Sunflower |
| Beulah POTW | Water - NPDES Minor Municipal Renewal | Beulah | Bolivar |
| Big Bay Utilities LLC, Big Bay Lake Subdivision | Water - State Operating Permit Renewal | Lumberton | Lamar |
| Biltrite Ripley Operations LLC | Water - NPDES Minor Industrial Renewal | Ripley | Tippah |
|
| Blackjack Composting | Solid Waste - Composting | Starkville | Oktibbeha |
| Blain Sand and Gravel Inc, Bailey Shop | Water - State Operating Permit | Georgetown | Copiah |
| Blessings LLC, Valley Road Mobile Home Park | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Blue Mountain Production Company, Taylor and Plant Property Mine | Air - Title V Modification | Blue Mountain | Tippah |
| Bogue Chitto Gin Inc | Air - State Operating Permit | Macon | Noxubee |
| Bogue Chitto Gin Inc | Air - Construction Permit | Macon | Noxubee |
| Booneville POTW | Water - NPDES Major Municipal Renewal | Booneville | Prentiss |
| Borden Dairy of Alabama LLC | Water - Pretreatment Renewal | Hattiesburg | Forrest |
| Bosarge and Edmonds Contractors Inc, Owned by Triple E Contracting Inc, Robo Landfill | Water - NPDES Storm Renewal | Shuqualak | Noxubee |
| Briar Hill Rest Home LLC | Water - NPDES Commercial Renewal | Florence | Rankin |
| Briarwood 39 Apartments Inc | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Briarwood Mobile Home Park | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Briarwood Waste Control Inc, Briarwood Estates Northeast | Water - NPDES Commercial Renewal | Collinsville | Lauderdale |
| Browning Creek Development | Water - NPDES Commercial Renewal | Starkville | Oktibbeha |
| Buffalo Services Inc, B Kwik Number 3 | Water - State Operating Permit Renewal | Natchez | Adams |
| Bunge-Ergon Vicksburg, LLC | Water - NPDES Minor Industrial Renewal | Vicksburg | Warren |
| Byram, City of, City of Byram Sewer Treatment Facility | Water - State Operating Permit | Byram | Hinds |
| C Js Place | Water - NPDES Commercial Renewal | Lorman | Claiborne |
| C and D Corporation, Homochitto RV Park | Water - NPDES Commercial Renewal | Bude | Franklin |
| CF Industries Nitrogen LLC | Air - Construction Permit | Yazoo City | Yazoo |
| Caledonia POTW | Water - NPDES Minor Municipal Renewal | Caledonia | Lowndes |
| Cancuns Mexican Grill | Water - NPDES Commercial Renewal | Vancleave | Jackson |
| Canebrake Utilities Association Inc, Canebrake Subdivision | Water - State Operating Permit | Hattiesburg | Lamar |
| Canebrake Utilities Association Inc, Canebrake Subdivision | Water Quality - 401 Certification | Hattiesburg | Lamar |
| Canton Municipal Utilities | Air - Title V Modification | Canton | Madison |
| Carlisle SynTec Inc, Plant 9 | Air - SMOP | Senatobia | Tate |
| Cartlidge Family Trust, Longleaf Acres Subdivision | Water - NPDES Commercial Renewal | Petal | Forrest |
| Cary Ginnery Inc | Air - State Operating Permit Renewal | Cary | Sharkey |
| Cat and Cow Veterinary Clinic PLLC | Water - NPDES Commercial Admin Mod | Olive Branch | Desoto |
| Caterpillar Inc | Water - Pretreatment Renewal | Corinth | Alcorn |
| Caterpillar Inc | Air - Title V Minor Modification | Corinth | Alcorn |
| Caterpillar Remanufactured Components Group | Air - SMOP Modification | Booneville | Prentiss |
| Caterpillar Remanufactured Components Group | Air - SMOP Modification | Booneville | Prentiss |
| Caviness Woodworking Company Inc | Air - Title V Renewal | Calhoun City | Calhoun |
| Cedar Creek Development Inc | Water - NPDES Commercial Renewal | Natchez | Adams |
| Cedar Meadows Mobile Home Community | Water - NPDES Commercial Renewal | Pontotoc | Pontotoc |
| CenterPoint Energy Field Services LLC, Anderson Plant | Air - Construction Permit | Liberty | Amite |
| Central Hinds Academy | Water - NPDES Commercial Renewal | Raymond | Hinds |
| Charles Henley, Henley Pit Number 1 Class II Rubbish Site | Solid Waste - Rubbish Renewal | Kiln | Hancock |
| Charles Henley, Henley Pit Number 2 Class II Rubbish Site | Solid Waste - Rubbish Renewal | Kiln | Hancock |
| Chestnut Hill Subdivision | Water Quality - 401 Certification | Madison | Madison |
| Chevron Products Company, Pascagoula Refinery | Air - Construction Permit Modification | Pascagoula | Jackson |
| Chevron Products Company, Pascagoula Refinery | Water Quality - 401 Certification | Pascagoula | Jackson |
| Chevron Products Company, Pascagoula Refinery | Air - Air-Construction PSD Admin Mod | Pascagoula | Jackson |
| Chevron Products Company, Pascagoula Refinery | Air - Construction PSD modification | Pascagoula | Jackson |
| Chevron Products Company, Pascagoula Refinery | Water Quality - 401 Certification | Pascagoula | Jackson |
| Chevron Products Company, Pascagoula Refinery | Water Quality - 401 Certification | Pascagoula | Jackson |
| Children of Destiny | Water - State Operating Permit Renewal | Mooreville | Lee |
| Choctaw Generation Limited Partnership, Red Hills Generation Facility | Water - NPDES Minor Industrial Admin Mod | Ackerman | Choctaw |
| Choctaw Generation Limited Partnership, Red Hills Generation Facility | Solid Waste - Non Mun Landfill ADMIN | Ackerman | Choctaw |
| Choctaw Generation Limited Partnership, Red Hills Generation Facility | Air - Construction Admin Mod | Ackerman | Choctaw |
| Choctaw Generation Limited Partnership, Red Hills Generation Facility | Air - Air-Construction PSD Admin Mod | Ackerman | Choctaw |
| Chromcraft Furniture | Water - Pretreatment Renewal | Senatobia | Tate |
| Chucks Flying Service | Water - State Operating Permit | Canton | Madison |
| Church of Acts, The | Water - NPDES Commercial Renewal | New Albany | Union |
| Church of Jesus Christ of Latter Day Saints, Oak Grove Building of LDS Church | Water - State Operating Permit Renewal | Hattiesburg | Lamar |
| Claiborne County Board of Supervisors, Hermanville Facility | Water - NPDES Minor Municipal Renewal | Hermanville | Claiborne |
| CleanEarth Inc, CleanEarth Inc Medical Waste Processing Facility | Solid Waste - Processing Renewal | Hattiesburg | Forrest |
| Cleveland Air Service Inc | Water - State Operating Permit Renewal | Cleveland | Bolivar |
| Clinton Briars POTW | Water - NPDES Minor Municipal Renewal | Clinton | Hinds |
| Clinton POTW, Lovett | Water - NPDES Minor Municipal Renewal | Clinton | Hinds |
| Clinton POTW, Northeast | Water - NPDES Minor Municipal Renewal | Clinton | Hinds |
| Coles Cove, Ralston Road Property | Water - State Operating Permit Renewal | Hattiesburg | Forrest |
| Columbus Light and Water Department, North Water Treatment Plant | Water - NPDES Minor Industrial Renewal | Columbus | Lowndes |
| Confortaire Inc | Air - SMOP Renewal | Tupelo | Lee |
| Cooper Tire Company, The | Air - Title V Renewal | Tupelo | Lee |
| Cooper Tire and Rubber Company, Clarksdale | Air - Title V Renewal | Clarksdale | Coahoma |
| Corso Distributing Company Inc | Water - NPDES Commercial Renewal | Lyon | Coahoma |
| Cottonwing Air LLC | Water - State Operating Permit Renewal | Indianola | Sunflower |
| Country Girls Creamery | Water - State Operating Permit Renewal | Lumberton | Pearl River |
| Country Side Recreational Vehicle Park | Water - State Operating Permit Renewal | Saucier | Harrison |
| Craddock Oil Company, The C Store Number 301 | Water - NPDES Commercial Renewal | Summit | Pike |
| Crossing, The, North Ridge Crossing Subdivision | Water - NPDES Commercial Renewal | Saltillo | Lee |
| Crown Health Care Laundry | Water - Pretreatment | Columbia | Marion |
| Cushions To Go | Air - SMOP Renewal | Pontotoc | Pontotoc |
| DAK Americas Mississippi Inc | Water - NPDES Minor Industrial Renewal | Bay St. Louis | Hancock |
| DAK Americas Mississippi Inc | Water - Pretreatment ADMIN | Bay St. Louis | Hancock |
| DAK Americas Mississippi Inc | Air - Title V Admin Mod | Bay St. Louis | Hancock |
| DDB Construction Company Inc, Ballard Pit and Madison South Class I Rubbish Site | Water - NPDES Storm Renewal | Ridgeland | Madison |
| DIberville, City of, DIberville SportsPlex | Water Quality - 401 Certification | D'Iberville | Harrison |
| Dart Container Corporation LLC | Air - Title V Renewal | Quitman | Clarke |
| David Neal Smith, Dairy | Water - State Operating Permit Renewal | Macon | Noxubee |
| DeSoto County Regional Utility Authority, Short Fork WWTF | Water - NPDES Major Municipal Renewal | Hernando | Desoto |
| DeSoto Pointe Development LLC, Plum Point | Water Quality - 401 Certification | Southaven | Desoto |
| DeSoto Treated Materials Inc, Solid Waste Management Facility | Solid Waste - Land Application Renewal | Wiggins | Stone |
|
| Decatur, Town of, Town of Decatur Mulching/Chipping/Composting Site | Solid Waste - Composting | Decatur | Newton |
| Dekalb POTW, Number 1 | Water - NPDES Minor Municipal Renewal | DeKalb | Kemper |
| Dekalb POTW, Number 2 | Water - NPDES Minor Municipal Renewal | DeKalb | Kemper |
| Delta Air Inc | Water - State Operating Permit Renewal | Belzoni | Humphreys |
| Delta MHP LLC | Water - NPDES Commercial Renewal | Sidon | Leflore |
| Delta Oil Mill | Air - Title V Renewal | Greenwood | Leflore |
| Delta Rain Inc, Highlands Subdivision | Water - NPDES Commercial Renewal | Senatobia | Tate |
| Denbury Onshore LLC, Brookhaven Central Processing Facility | Air - SMOP Renewal | Brookhaven | Lincoln |
| Denbury Onshore LLC, Cranfield Central Facility | Air - SMOP Renewal | Cranfield | Adams |
| Denbury Onshore LLC, McComb Test Site Number 1 | Water - NPDES Minor Industrial Renewal | McComb | Pike |
| Denbury Onshore LLC, Pipeline | Water Quality - 401 Certification | Goshen Springs | Rankin |
| Denbury Onshore LLC, Tinsley Central Facility | Air - SMOP Renewal | Tinsley | Yazoo |
| Developers Inc, Chapel Woods Subdivision | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Diamondhead Water and Sewer District | Water - NPDES Major Municipal Renewal | Diamondhead | Hancock |
| Dickerson and Bowen Inc, McComb Asphalt Plant | Water - NPDES Minor Industrial Renewal | McComb | Pike |
| Dixieland Furniture Manufacturing Inc | Air - SMOP Renewal | Houston | Chickasaw |
| Doyenne Hotel | Water - NPDES Commercial Renewal | Lumberton | Pearl River |
| DuPont DeLisle Facility | Air - Construction PSD modification | Pass Christian | Harrison |
| East Jasper School District, The New William J Berry Elementary School | Water - NPDES Commercial Renewal | Heidelberg | Jasper |
| Eaton Custom Seating LLC | Air - SMOP Renewal | Pontotoc | Pontotoc |
| Edgewood Park Inc | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Elevance Natchez Inc | Air - SMOP Renewal | Natchez | Adams |
| Elevance Natchez Inc | Air - Construction Admin Mod | Natchez | Adams |
| Elevance Natchez Inc | Air - Construction Permit Modification | Natchez | Adams |
| Ellisville State School | Water - NPDES Minor Municipal Renewal | Ellisville | Jones |
| Elm Lake Association, Elm Lake Ranch Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Encana Oil and Gas USA Inc, Anderson 17H-1 Production Facility | Air - Construction Permit | Liberty | Amite |
| Encana Oil and Gas USA Inc, Anderson 18H-1 Production Facility | Air - Construction Permit | Gillsburg | Amite |
| Encana Oil and Gas USA Inc, Ash 31H-1 and 31H-2 Production Facility | Air - Construction Permit | Centreville | Amite |
| Encana Oil and Gas USA Inc, Horseshoe Hill 10H-1 Production Facility | Air - SMOP | Woodville | Wilkinson |
| Encana Oil and Gas USA Inc, Joe Jackson 4H-2 Production Facility | Air - Construction Permit | Liberty | Amite |
| Encana Oil and Gas USA Inc, Lawson 25H-1 and 25-13H-1 Production Facility | Air - Construction Permit | Gillsburg | Amite |
| Encore Furniture LLC | Air - Construction Permit | Pontotoc | Pontotoc |
| Entergy Mississippi Inc, Baxter Wilson Plant | Air - Title V Renewal | Vicksburg | Warren |
| Entergy Mississippi Inc, Delta Plant | Water - NPDES Minor Industrial Renewal | Cleveland | Bolivar |
| Entergy Mississippi Inc, Hinds County Plant | Air - Air-Construction PSD Admin Mod | Jackson | Hinds |
| Entergy Mississippi Inc, Hinds County Plant | Air - Title V Admin Mod | Jackson | Hinds |
| Enviva Pellets Wiggins LLC | Air - Construction Permit Modification | Wiggins | Stone |
| Ergon Asphalt and Emulsions Inc, Yellow Creek | Air - SMOP Renewal | Iuka | Tishomingo |
| Ergon Asphalt and Emulsions Inc, Yellow Creek | Water - NPDES Minor Industrial Renewal | Iuka | Tishomingo |
| Ergon Trucking Inc, Vicksburg | Water - Pretreatment | Vicksburg | Warren |
| Esco Corporation | Air - Air-Construction PSD Admin Mod | Newton | Newton |
| Esco Corporation | Air - Air-Construction PSD | Newton | Newton |
| Ethel POTW | Water - NPDES Minor Municipal Renewal | Ethel | Attala |
| Ethos Alternative Energy Mississippi LLC | Air - SMOP | Meridian | Lauderdale |
| FMC Technologies Inc | Water - Pretreatment Renewal | Saltillo | Lee |
| Faith Assembly of God Church | Water - State Operating Permit Renewal | McComb | Pike |
| Family Life Fellowship | Water - State Operating Permit Renewal | Lucedale | George |
| Farmers Grain Terminal Inc, Greenwood Facility | Air - SMOP Renewal | Greenwood | Leflore |
| Farmers Grain Terminal, Greenville | Air - SMOP Renewal | Greenville | Washington |
| Fayette POTW, North Lagoon | Water - NPDES Minor Municipal Renewal | Fayette | Jefferson |
| Fayette POTW, Northeast | Water - NPDES Minor Municipal Renewal | Fayette | Jefferson |
| Fayette POTW, Southwest | Water - NPDES Minor Municipal Renewal | Fayette | Jefferson |
| Fernwood Industries LLC | Hazardous Waste - TSD Post-Closure Renewal | Fernwood | Pike |
| Five County Child Development Program Inc, Pinola Head Start Center | Water - NPDES Commercial Renewal | Pinola | Simpson |
| Five Star Marine Inc | Air - Title V | Ripley | Tippah |
| Flora POTW | Water - NPDES Minor Municipal Renewal | Flora | Madison |
| Florence Gardens Subdivision | Water Quality - 401 Certification | Gulfport | Harrison |
| Forest, City of, City of Forest Class II Rubbish Disposal Site | Solid Waste - Rubbish Modification | Forest | Scott |
| Forrest County General Hospital | Air - SMOP Admin Mod | Hattiesburg | Forrest |
| Forrest County General Hospital | Air - SMOP Renewal | Hattiesburg | Forrest |
| Forrest County General Hospital | Air - Construction Admin Mod | Hattiesburg | Forrest |
| Four County Electric Power Association | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Four County Gin Inc | Water - State Operating Permit Renewal | Calhoun City | Calhoun |
| Foxworth POTW | Water - NPDES Minor Municipal Renewal | Foxworth | Marion |
| Franklin Development Company LLC | Water - Pretreatment | Houston | Chickasaw |
| Frog Hollow Campground and RV Park LLC | Water - NPDES Commercial Renewal | Grenada | Grenada |
| Fulton POTW, West Central | Water - NPDES Minor Municipal Renewal | Fulton | Itawamba |
| Fusion Utility Company Inc, Carters Plantation Subdivision | Water - NPDES Commercial Admin Mod | Lewisburg | Desoto |
| Fusion Utility Company Inc, Village of Cedarview | Water - NPDES Commercial Admin Mod | Olive Branch | Desoto |
| Future Pipe Industries Inc | Air - Title V Renewal | Gulfport | Harrison |
| G and K Services Inc | Water - Pretreatment Renewal | Jackson | Hinds |
| GCP Laboratories | Water - NPDES Minor Industrial Renewal | Gulfport | Harrison |
| GEO Specialty Chemicals, GEO Land Application Project, Creel Property | Solid Waste - Land Application | New Hebron | Lawrence |
| GEO Specialty Chemicals, GEO Land Application Project, Stephens Property | Solid Waste - Land Application | New Hebron | Lawrence |
| GEO Specialty Chemicals, GEO Land Application Project, Turnage Property | Solid Waste - Land Application | Silver Creek | Lawrence |
| GNS Frac LLC | Air - Construction Permit | Greenville | Washington |
| George County Schools, Benndale Elementary School | Water - State Operating Permit Renewal | Lucedale | George |
| George McGaha, Farm Irrigation Improvements | Water Quality - 401 Certification | Lambert | Quitman |
| Georgia Pacific Chemicals LLC, Taylorsville | Water - NPDES Storm Renewal | Taylorsville | Smith |
| Georgia Pacific Chemicals LLC, Taylorsville | Air - Title V Renewal | Taylorsville | Smith |
| Georgia Pacific Wood Products LLC, Bay Springs Facility | Air - Title V Minor Modification | Bay Springs | Jasper |
| Georgia Pacific Wood Products LLC, Bay Springs Facility | Water - NPDES Minor Industrial Renewal | Bay Springs | Jasper |
| Georgia Pacific Wood Products LLC, Columbia | Air - Title V Modification | Columbia | Marion |
| Georgia Pacific Wood Products LLC, Taylorsville | Water - Pretreatment Renewal | Taylorsville | Smith |
| Georgia Pacific Wood Products LLC, Taylorsville | Air - Title V Modification | Taylorsville | Smith |
| Gibraltar Energy Company, Saxophone 22- 1 Facility | Air - Construction Admin Mod | West Point | Clay |
| Gloster, Town of, Town of Gloster Class II Rubbish Site | Solid Waste - Rubbish | Gloster | Amite |
| Godfreys Trailer Park | Water - State Operating Permit Renewal | Forest | Scott |
| Goel Investments, LLC, Goel Apartment Complex | Water Quality - 401 Certification | Gulfport | Harrison |
| Goobers Laundromat | Water - State Operating Permit Renewal | Lucedale | George |
| Goodrich Petroleum Company LLC, Denkmann 33- 28 H Number 1 Production Facility | Air - Construction Permit | Liberty | Amite |
| Goodrich Petroleum Company LLC, Huff 18 7 E Number 1 Production Facility | Air - Construction Permit | Liberty | Amite |
| Goodrich Petroleum Company LLC, Smith 5 29H Number 1 Production Facility | Air - Construction Permit | Magnolia | Amite |
| Goodrich Petroleum Company LLC,- Crosby Minerals 12-1 -1E Production Facility | Air - Construction Permit Modification | Centreville | Wilkinson |
| Goodrich Petroleum Company LLC,- Crosby Minerals 12-1 -1E Production Facility | Air - Construction Permit | Centreville | Wilkinson |
| Grants Headstart Center | Water - State Operating Permit Renewal | Hattiesburg | Forrest |
| Green Acres Water Association Inc, East Park Subdivision | Water - NPDES Commercial Renewal | Lyon | Coahoma |
| Green Brothers Gravel Company Inc, Bradley Mine Number Six, Plant 15 | Air - SMOP | Columbia | Marion |
| Green Brothers Gravel Company Inc, Harmony Pit, Plant 65 | Air - SMOP | Crystal Springs | Copiah |
| Greene County Board of Supervisors, Green Rural Events Center | Water - State Operating Permit Renewal | Leakesville | Greene |
| Greene County School District, Greene County High School (OOB) | Water - NPDES Renewal | Leakesville | Greene |
| Greenleaf CO2 Solutions LLC, Hiwannee CO2 Plant | Water Quality - 401 Certification | Waynesboro | Wayne |
| Greenleaf CO2 Solutions LLC, Hiwannee CO2 Plant | Air - Construction Permit | Waynesboro | Wayne |
| Greenwood POTW | Water Quality - 401 Certification | Greenwood | Leflore |
|
| Grenada County Board of Supervisors, Grenada County Class I Rubbish Site | Solid Waste - Rubbish Renewal | Grenada | Grenada |
| Grenada POTW, Holcomb Facility | Water - NPDES Minor Municipal Renewal | Holcomb | Grenada |
| Grenada Stamping and Assembly Inc | Air - Construction Permit Modification | Grenada | Grenada |
| Grenada Stamping and Assembly Inc | Air - Construction Permit | Grenada | Grenada |
| Griffin Industries LLC | Air - Construction Permit Modification | Jackson | Hinds |
| Griffin Industries LLC | Water - Pretreatment Modification | Jackson | Hinds |
| Grundfest and Klaus Gin Inc | Air - State Operating Permit Renewal | Cary | Sharkey |
| Guardian Fiberglass, Inc | Air - Title V Modification | Mineral Wells | Desoto |
| Gulf Coast Leasing, LLC, Leatherman Clinic | Water Quality - 401 Certification | Gulfport | Harrison |
| Gulf Coast Research Laboratory | Water - Pretreatment Renewal | Ocean Springs | Jackson |
| Gulf South Pipeline Company, LP Jackson Compressor Station | Air - Title V Renewal | Flowood | Rankin |
| Gulf South Pipeline Company, McComb Compressor Station | Air - Title V Renewal | Jayess | Walthall |
| Gulf States Canners Inc | Water - Pretreatment Renewal | Clinton | Hinds |
| Gulfport Biloxi Regional Airport | Water Quality - 401 Certification | Gulfport | Harrison |
| Gunnison POTW | Water - NPDES Minor Municipal Renewal | Gunnison | Bolivar |
| Guntown POTW | Water - NPDES Minor Municipal Renewal | Guntown | Lee |
| Hamilton Storage GP | Water - NPDES Commercial Renewal | Southaven | Desoto |
| Hammett Gravel Company Inc, Bluff Farms | Air - SMOP | Zieglerville | Yazoo |
| Hammett Gravel Company Inc, Yazoo Pit | Air - SMOP | Yazoo City | Yazoo |
| Hancock County Development Commission, Stennis Airport Administrative Building | Water Quality - 401 Certification | Kiln | Hancock |
| Hancock County Utility Authority, Waveland POTW | Water - NPDES Major Municipal Renewal | Waveland | Hancock |
| Harcros Mississippi LLC | Water - Pretreatment Renewal | Vicksburg | Warren |
| Harrison County School District, New Elementary School | Water Quality - 401 Certification | Gulfport | Harrison |
| Harrison County Utility Authority, West Biloxi POTW | Water - NPDES Major Municipal Renewal | Biloxi | Harrison |
| Harrison County Wastewater and Solid Waste Management Authority, Eagle Point POTW | Water - NPDES Minor Municipal Renewal | Biloxi | Harrison |
| Haygood Trailer Park | Water - NPDES Commercial Renewal | McComb | Pike |
| Henry's Mobile Home Park | Water - State Operating Permit Admin Mod | Biloxi | Harrison |
| Hickory POTW | Water - NPDES Minor Municipal Renewal | Hickory | Newton |
| Hickorys, The | Water - NPDES Commercial Renewal | Sardis | Panola |
| Highlands Subdivision, The | Water Quality - 401 Certification | D'Iberville | Harrison |
| Hills of the Bear LLC, Hills of the Bear LLC South Facility | Water - State Operating Permit Renewal | Iuka | Tishomingo |
| Holloway Air Services Inc | Water - State Operating Permit Renewal | Drew | Sunflower |
| Holmes County School District, Goodman Pickens Elementary School | Water - NPDES Commercial Renewal | Goodman | Holmes |
| Holmes County School District, Milestone Elementary School | Water - NPDES Commercial Renewal | Tchula | Holmes |
| Holmes County School District, Tchula and S V Marshall Attendance Center | Water - NPDES Commercial Renewal | Lexington | Holmes |
| Homan Industries | Water - NPDES Minor Industrial, NPDES Storm | Fulton | Itawamba |
| Homestead Sewer System LLC, Homestead Subdivision | Water - NPDES Commercial Renewal | Hattiesburg | Forrest |
| Hood Industries Inc, Wiggins | Water - State Operating Permit | Wiggins | Stone |
| Howard Flying Services Inc | Water - State Operating Permit Renewal | Clarksdale | Coahoma |
| Huey Stockstill Inc | Water - NPDES Minor Industrial Renewal | Picayune | Pearl River |
| Hunter Douglas Inc, Tupelo Center | Air - SMOP Renewal | Shannon | Lee |
| Hunter Engineering Company, Raymond | Water - Pretreatment Renewal | Raymond | Hinds |
| Huntington Park Estates | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Ideal Foam LLC, Pontotoc Facility | Air - SMOP | Pontotoc | Pontotoc |
| Ideal Foam LLC, Ripley Facility | Air - SMOP | Ripley | Tippah |
| Immanuel Baptist Church, Immanuel Christian School | Water - NPDES Commercial Renewal | Steens | Lowndes |
| Institute For Marine Mammal Studies, Research and Rehabilitation Facility | Water - NPDES Commercial Renewal | Gulfport | Harrison |
| International Paper Company, Houston | Water - Pretreatment Modification | Houston | Chickasaw |
| International Paper, Vicksburg Mill | Water - NPDES Major Industrial Modification | Redwood | Warren |
| Isle of Capri Casino | Water - NPDES Commercial Modification | Lula | Coahoma |
| Itawamba County Schools, Dorsey Elementary School | Water - NPDES Commercial Renewal | Fulton | Itawamba |
| JJC Enterprises Inc, Oakland Ridge Duplexes | Water - State Operating Permit Renewal | Petal | Forrest |
| Jackson County Port Authority, Bayou Casotte Water Treatment Plant | Water - State Operating Permit Renewal | Moss Point | Jackson |
| Jackson County Port Authority, Dredging Bayou Casotte | Water Quality - 401 Certification | Pascagoula | Jackson |
| Jackson County School District, East Central Middle School | Water - NPDES Commercial Renewal | Hurley | Jackson |
| Jackson County School District, Vancleave High School | Water - NPDES Commercial Renewal | Vancleave | Jackson |
| Jackson County School District, Vancleave Junior High School | Water - NPDES Commercial Renewal | Vancleave | Jackson |
| Jackson County Utility Authority, Big Hill Acres Water and Sewerage Project | Water Quality - 401 Certification | Vancleave | Jackson |
| Jackson County Utility Authority, Gautier POTW | Water - NPDES Major Municipal Renewal | Gautier | Jackson |
| Jackson County Utility Authority, West Jackson County POTW | Water - State Operating Permit Renewal | Ocean Springs | Jackson |
| Jackson, City of, Big Creek Drainage Improvements at Hidden Valley Lane | Water Quality - 401 Certification | Jackson | Hinds |
| Jackson, City of, MS4 Stormwater Management Program | Water - MS4 Stormwater Renewal | Jackson | Hinds |
| Jennifer King, Dairy | Water - State Operating Permit Renewal | Brookhaven | Lincoln |
| Joe N Miles and Sons Inc | Air - Title V Minor Modification | Silver Creek | Lawrence |
| Jones County Schools, Shady Grove Attendance Center | Water - NPDES Commercial Renewal | Laurel | Jones |
| Joseph Phillips, Phillips Class II Rubbish Site | Solid Waste - Rubbish Renewal | Santa Rosa | Hancock |
| Justins On The Lake | Water - State Operating Permit Renewal | Summit | Pike |
| KBH Corporation, The | Air - Title V Renewal | Clarksdale | Coahoma |
| KOA Meridian East, Toomsuba | Water - NPDES Commercial Renewal | Toomsuba | Lauderdale |
| Keith Huber Corporation | Air - SMOP Admin Mod | Gulfport | Harrison |
| Keithco Petroleum Inc | Water - State Operating Permit Renewal | Moselle | Jones |
| Kelley Brothers | Water - State Operating Permit | Waynesboro | Wayne |
| Kentucky Tennessee Clay Company, Sledge | Air - Title V Minor Modification | Crenshaw | Quitman |
| KiOR Inc | Air - Construction Permit Modification | Columbus | Lowndes |
| King Rental Properties Inc | Water - NPDES Commercial Renewal | Florence | Rankin |
| Kingsford Manufacturing Company | Air - Construction PSD modification | Glen | Alcorn |
| Kingsford Manufacturing Company | Air - Title V Minor Modification | Glen | Alcorn |
| Kloeckner Metals Corporation | Air - SMOP Renewal | Louisville | Winston |
| Koch Farms of Mississippi LLC | Air - SMOP Renewal | Morton | Scott |
| Koch Foods Inc, Brooksville Facility | Water - NPDES Minor Industrial Renewal | Brooksville | Noxubee |
| Kosciusko POTW, South | Water - NPDES Major Municipal Renewal | Kosciusko | Attala |
| Krystal Gravel, Krystal Gravel Pit Number 3 | Solid Waste - Rubbish | Crystal Springs | Copiah |
| Kwik Kar Wash | Water - NPDES Commercial Renewal | Gautier | Jackson |
| La Z Boy Inc, Plant 21 | Air - SMOP Renewal | Newton | Newton |
| Laclede Chain Manufacturing Company | Water - Pretreatment | Vicksburg | Warren |
| Lakeview Holdings LLC, Lakeview Mobile Home Park | Water - State Operating Permit Renewal | Walls | Desoto |
| Lauderdale County School District, Northeast Middle School | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Lauderdale County School District, West Lauderdale Attendance Center | Water - NPDES Commercial Renewal | Collinsville | Lauderdale |
| Leading Edge Mississippi Inc | Air - SMOP Modification | Greenville | Washington |
| Leaf River Cellulose, LLC | Solid Waste - Non Mun Landfill Renewal | New Augusta | Perry |
|
| Leaf River Cellulose, LLC | Solid Waste - Composting | New Augusta | Perry |
| Leaf River Forest Products, LLC | Air - Title V Renewal | New Augusta | Perry |
| Leakesville POTW | Water - NPDES Minor Municipal Renewal | Leakesville | Greene |
| Lees Steakhouse | Water - NPDES Commercial | Sebastopol | Scott |
| Lily Rose Water Association Inc, Stamps Subdivision | Water - NPDES Commercial Renewal | Prentiss | Jefferson Davis |
| Lincoln County School District, Loyd Star School | Water - NPDES Commercial Renewal | Brookhaven | Lincoln |
| Lincoln County Schools, Bogue Chitto Attendance Center | Water - NPDES Commercial Renewal | Bogue Chitto | Lincoln |
| Lincoln County Schools, Enterprise Attendance Center | Water - NPDES Commercial Renewal | Brookhaven | Lincoln |
| Lipscomb Oil Company Inc, The Filling Station Number 16 | Water - NPDES Commercial Renewal | Greenville | Washington |
| Little Angels Day Care Center | Water - State Operating Permit Renewal | Perkinston | Stone |
| Lost Mountain Mobile Home Park | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Louisville Municipal School District, Nanih Waiya Attendance Center | Water - NPDES Commercial Renewal | Louisville | Winston |
| Louisville POTW, East | Water - NPDES Minor Municipal Renewal | Louisville | Winston |
| Louisville POTW, South | Water - NPDES Minor Municipal Renewal | Louisville | Winston |
| Loves Travel Stops and Country Stores Inc, Number 343 | Water - NPDES Commercial Renewal | Toomsuba | Lauderdale |
| Lowndes County School System, West Lowndes High School | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Luvel Dairy Products | Water - Pretreatment Renewal | Kosciusko | Attala |
| MDOT, Interstate 10 Welcome Center | Water - NPDES Commercial Renewal | Moss Point | Jackson |
| MDOT, Interstate 10 West Truck Scales | Water - NPDES Commercial Renewal | Moss Point | Jackson |
| MDOT, Interstate 55 North, Rest Area, Holmes | Water - NPDES Commercial Renewal | West | Holmes |
| MDOT, Interstate 55 South, Rest Area, Carroll | Water - NPDES Commercial Renewal | Vaiden | Carroll |
| MDOT, Interstate10 East, Truck Scale, Jackson | Water - NPDES Commercial Renewal | Moss Point | Jackson |
| MEC dba The Pony | Water - NPDES Commercial Renewal | Starkville | Lowndes |
| MSARNG, Camp McCain Training Center | Water - NPDES Federal Minor Renewal | Elliott | Grenada |
| Maben POTW | Water - NPDES Minor Municipal Renewal | Maben | Webster |
| MacLand Disposal Inc II, A wholly owned subsidiary of Waste Recyclers Holdings LLC | Solid Waste - Rubbish Renewal | Moss Point | Jackson |
| Magee POTW | Water - NPDES Minor Municipal Renewal | Magee | Simpson |
| Magnolia Hills Inc, Mobile Home Park | Water - NPDES Commercial Renewal | Nesbit | Desoto |
| Magnolia POTW, North | Water - NPDES Minor Municipal Renewal | Magnolia | Pike |
| Magnolia POTW, South | Water - NPDES Minor Municipal Renewal | Magnolia | Pike |
| Magnolia Spring Assembly Of God Church | Water - State Operating Permit Renewal | Hurley | Jackson |
| Mantachie POTW | Water - NPDES Minor Municipal Renewal | Mantachie | Itawamba |
| Mars Food US, LLC | Air - Title V Minor Modification | Greenville | Washington |
| Marshall Durbin | Air - SMOP Renewal | Waynesboro | Wayne |
| Masonite Corporation | Water - NPDES Minor Industrial Renewal | Laurel | Jones |
| Mathiston POTW | Water - NPDES Minor Municipal Renewal | Mathiston | Choctaw |
| Maxwell Flying Service Inc | Water - State Operating Permit Renewal | Benoit | Bolivar |
| Metso Minerals Industries Inc, Stephens Adamson | Air - Title V Renewal | Clarksdale | Coahoma |
| Midcontinent Express Pipeline LLC, MEP 4 Vicksburg Compressor Station | Air - Title V | Edwards | Hinds |
| Mikes Flying Service, Bruce Facility | Water - State Operating Permit Renewal | Bruce | Calhoun |
| Millies Cafe | Water - State Operating Permit Renewal | Sallis | Attala |
| Mississippi Baptist Convention Board, Central Hills Baptist Retreat | Water - NPDES Commercial Renewal | West | Attala |
| Mississippi Department of Marine Resources, Deer Island, Northern Shore, Artificial Reef | Water Quality - 401 Certification | Biloxi | Harrison |
| Mississippi Department of Marine Resources, Round Island Beneficial Use Site | Water Quality - 401 Certification | Pascagoula | Jackson |
| Mississippi Department of Wildlife Fisheries and Parks, Clarkco State Park | Water - NPDES Commercial Renewal | Quitman | Clarke |
| Mississippi Department of Wildlife Fisheries and Parks, Holmes County State Park | Water - NPDES Commercial Renewal | Durant | Holmes |
| Mississippi Department of Wildlife Fisheries and Parks, Hugh White State Park | Water - NPDES Commercial Renewal | Grenada | Grenada |
| Mississippi Department of Wildlife Fisheries and Parks, Hugh White State Park, Carver Point | Water - NPDES Commercial Renewal | Grenada | Grenada |
| Mississippi Department of Wildlife Fisheries and Parks, John Kyle State Park | Water - NPDES Commercial Renewal | Sardis | Panola |
| Mississippi Department of Wildlife Fisheries and Parks, Kemper County Lake | Water - NPDES Commercial Renewal | DeKalb | Kemper |
| Mississippi Department of Wildlife Fisheries and Parks, Tombigbee State Park | Water - NPDES Commercial Renewal | Tupelo | Lee |
| Mississippi Department of Wildlife Fisheries and Parks, Tombigbee State Park | Water - NPDES Commercial Modification | Tupelo | Lee |
| Mississippi Department of Wildlife, Fisheries and Parks, Paul B Johnson State Park | Water - NPDES Commercial Renewal | Hattiesburg | Forrest |
| Mississippi Phosphates Corporation | Water - NPDES Major Industrial Modification | Pascagoula | Jackson |
| Mississippi Polymers Inc | Water - Pretreatment ADMIN | Corinth | Alcorn |
| Mississippi Polymers Inc | Water - NPDES Minor Industrial Admin Mod | Corinth | Alcorn |
| Mississippi Polymers Inc | Air - Title V Admin Mod | Corinth | Alcorn |
| Mississippi Power Company, Kemper IGCC Facility | Air - Air-Construction PSD Admin Mod | DeKalb | Kemper |
| Mississippi Power Company, Plant Victor J Daniel | Solid Waste - Non Mun Landfill | Moss Point | Jackson |
| Mississippi Power Company, Plant Victor J Daniel | Water Quality - 401 Certification | Moss Point | Jackson |
| Mississippi Regional Housing, Dan Stepney Homes | Water - NPDES Commercial Renewal | Columbia | Marion |
| Mississippi State Port Authority of Gulfport | Water Quality - 401 Certification | Gulfport | Harrison |
| Mississippi Wildlife Fisheries and Parks, Lake Lowndes State Park | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Monsanto Company | Air - SMOP Modification | Hollandale | Washington |
| Monsanto Company | Air - SMOP Renewal | Hollandale | Washington |
| Montgomery Quarters LLC, Mobile Home Park | Water - NPDES Commercial Renewal | Starkville | Oktibbeha |
| Monticello POTW | Water - NPDES Minor Municipal Renewal | Monticello | Lawrence |
| Mooreville Treatment System LLC | Water - NPDES Commercial Admin Mod | Mooreville | Lee |
| Moss Point School District, Orange Lake Elementary | Water - NPDES Commercial Renewal | Moss Point | Jackson |
| Motiva Enterprises LLC, Collins Terminal | Air - SMOP Modification | Collins | Covington |
| Mound Bayou POTW | Water - NPDES Minor Municipal Renewal | Mound Bayou | Bolivar |
| Murphy Oil USA Inc,- Meridian Terminal | Air - SMOP Renewal | Meridian | Lauderdale |
| Murphy Oil USA Inc,- Meridian Terminal | Water - NPDES Minor Industrial Renewal | Meridian | Lauderdale |
| Natchez Business Ventures LLC, Plantation Mobile Home Park | Water - NPDES Commercial Renewal | Natchez | Adams |
| Natchez POTW | Water - NPDES Major Municipal Renewal | Natchez | Adams |
| National Aeronautics and Space Administration, John C Stennis Space Center | Air - Title V Renewal | Stennis Space Center | Hancock |
| National Warmwater Aquacultural Center, Delta Branch Experiment Station, The | Water - NPDES Minor Industrial Renewal | Stoneville | Washington |
| Natureplex LLC | Water - Pretreatment | Olive Branch | Desoto |
| New Albany POTW | Water - NPDES Major Municipal Renewal | New Albany | Union |
| Nicholson Water and Sewer Association Inc | Water - NPDES Commercial Renewal | Nicholson | Pearl River |
| Nidec Motor Corporation | Air - SMOP Renewal | Southaven | Desoto |
| Nissan North America Inc, Canton Manufacturing Facility | Water - Pretreatment Renewal | Canton | Madison |
| Nissan North America Inc, Canton Manufacturing Facility | Air - Title V Modification | Canton | Madison |
| Norbertine Priory of St Moses The Black, The | Water - State Operating Permit Renewal | Raymond | Hinds |
| Norbord Industries Inc | Air - Title V Modification | Guntown | Lee |
| Norbord Industries Inc | Air - Construction Permit Modification | Guntown | Lee |
| North Central Baptist Association Inc, dba Lakeside Baptist Assembly, Camp Lakeside | Water - State Operating Permit Renewal | Charleston | Tallahatchie |
| Noxapater POTW, North | Water - NPDES Minor Municipal Renewal | Noxapater | Winston |
| Noxapater POTW, South | Water - NPDES Minor Municipal Renewal | Noxapater | Winston |
| Noxapater, Town of, Flower Ridge Water Treatment Plant | Water - State Operating Permit Renewal | Noxapater | Winston |
| Oakland POTW | Water - State Operating Permit Renewal | Oakland | Yalobusha |
| Oakview Utility Company Inc, Rowan Oak Subdivision | Water - NPDES Commercial Renewal | Jackson | Hinds |
| Oxford School District, OSD Bus Shop and Maintenance Facility | Water - State Operating Permit Renewal | Oxford | Lafayette |
| PACCAR Engine Company | Air - SMOP Renewal | Columbus | Lowndes |
| PACCAR Engine Company | Water - Pretreatment Renewal | Columbus | Lowndes |
| PDC Utilities LLC, Grand Harbor Condominiums | Water - NPDES Commercial Renewal | Iuka | Tishomingo |
| Palmer Home For Children, Mississippi Sheriffs Boys and Girls Ranch | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Palmer Home for Children | Water - State Operating Permit Renewal | Lake Cormorant | Desoto |
| Pandle Inc, Proposed Chevron Parking Lot | Water Quality - 401 Certification | Pascagoula | Jackson |
| Pascagoula Water Treatment Plant, Bayou Casotte | Water - NPDES Minor Industrial Renewal | Pascagoula | Jackson |
| Pascagoula Water Treatment Plant, Communy Avenue | Water - NPDES Minor Industrial Renewal | Pascagoula | Jackson |
| Pat Harrison Waterway District, Big Creek Watershed Site Number 10 | Water - NPDES Commercial Renewal | Soso | Jones |
| Pat Harrison Waterway District, Dunn's Falls Water Park | Water - State Operating Permit Renewal | Enterprise | Lauderdale |
| Pat Harrison Waterway District, Little Black Creek Water Park | Water - NPDES Commercial Renewal | Lumberton | Lamar |
| Pat Harrison Waterway District, Maynor Creek Water Park | Water - NPDES Commercial Renewal | Waynesboro | Wayne |
| Pat Harrison Waterway District, Turkey Creek Water Park | Water - NPDES Commercial Renewal | Decatur | Newton |
| Pearl River Basin Development District, Walkiah Bluff Water Park | Water - State Operating Permit Renewal | Picayune | Pearl River |
| Pearl River County Board of Supervisors, Pearl River County Health Department | Water - State Operating Permit Renewal | Carriere | Pearl River |
| Pearl River County School District, Pearl River Central High School | Water - NPDES Commercial Renewal | Carriere | Pearl River |
| Pearl River County Utility Authority, Poplarville POTW | Water - NPDES Major Municipal Renewal | Poplarville | Pearl River |
| Pearl River Food Service | Water - State Operating Permit Renewal | Philadelphia | Neshoba |
| Pecan Lakes Utility Company LLC, Pecan Lakes Subdivision | Water - NPDES Commercial Renewal | Petal | Forrest |
| Peco Foods Inc, Lake Facility | Air - SMOP | Lake | Newton |
| Pennzoil Quaker State Company, The | Air - SMOP Renewal | Vicksburg | Warren |
| Pennzoil Quaker State Company, The | Water - NPDES Minor Industrial, NPDES Storm Renewal | Vicksburg | Warren |
| Peterson Subdivision | Water - State Operating Permit Renewal | Sturgis | Winston |
| Petro Harvester Operating Company LLC, South Cypress Creek Facility | Air - Title V Renewal | Waynesboro | Wayne |
| Petro Harvester Operating Company LLC, West Nancy Field | Air - Title V Renewal | Vossburg | Clarke |
| Philadelphia POTW | Water - NPDES Major Municipal Renewal | Philadelphia | Neshoba |
| Phillip Water and Sewer Association | Water - NPDES Commercial Renewal | Philipp | Tallahatchie |
| Piave Grocery and Farm Supply | Water - NPDES Commercial Renewal | Richton | Greene |
| Pickens POTW | Water - NPDES Minor Municipal Renewal | Pickens | Holmes |
| Pickwick Pines Resort Inc | Water - State Operating Permit Renewal | Iuka | Tishomingo |
| Pine Ridge Apartments | Water - State Operating Permit Renewal | Tylertown | Walthall |
| Plantation Village Waste Inc | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Plantation Village Waste Systems Inc, Poplar Ridge Subdivision | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Platte Chemical Co dba Loveland Products | Air - SMOP Renewal | Greenville | Washington |
| Platte Chemical Co dba Loveland Products | Water - NPDES Minor Industrial, NPDES Storm Renewal | Greenville | Washington |
| Polychemie Inc | Air - SMOP Modification | Pearlington | Hancock |
| Pontotoc, City of, Activated Sludge Facility | Water - NPDES Major Municipal Modification | Pontotoc | Pontotoc |
| Poole Subdivision | Water - NPDES Commercial Renewal | Terry | Hinds |
| Poplar Springs Nursing Center | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Precision Packaging Inc | Air - SMOP Modification | Jackson | Hinds |
| Pregis Innovative Packaging | Air - Title V Admin Mod | Tupelo | Lee |
| Pregis Innovative Packaging | Air - Title V Admin Mod | Tupelo | Lee |
| Premier Natural Resources II LLC, BOE 16 -11 Number 1 Production Facility | Air - Construction Admin Mod | Columbia | Marion |
| Premier Natural Resources II LLC, Barnes 11- 9 Number 1 Production Facility | Air - Construction Admin Mod | Prentiss | Lawrence |
| Premier Natural Resources II LLC, Bates 8-1 Number 1 Compressor Station | Air - Construction Admin Mod | Sartartia | Yazoo |
| Premier Natural Resources II LLC, Mauldin 26 - 14 Number 1 Production Facility | Air - Construction Admin Mod | Williamsburg | Covington |
| Premier Natural Resources II LLC, Nancy Riley Number 1 Production Facility | Air - Construction Admin Mod | Silver Creek | Lawrence |
| Premier Natural Resources II LLC, Odom Production Facility | Air - Construction Admin Mod | Williamsburg | Covington |
| Premier Natural Resources II LLC, Section 15 Production Facility | Air - Construction Admin Mod | Prentiss | Jefferson Davis |
| Premier Natural Resources II LLC, Section 26 Production Facility | Air - Construction Admin Mod | Gwinville | Jefferson Davis |
| Premier Natural Resources II LLC, Williams 9 -12 Number 1 Production Facility | Air - Construction Admin Mod | Satartia | Yazoo |
| Premier Natural Resources II LLC, Williams 9 -12 Number 1 Production Facility | Air - SMOP Admin Mod | Satartia | Yazoo |
| Premier Natural Resources II LLC, Williamsburg Central Facility | Air - Construction Admin Mod | Williamsburg | Covington |
| Prentiss POTW | Water - NPDES Minor Municipal Renewal | Prentiss | Jefferson Davis |
| Price Trailer Park | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| ProVia Products LLC, dba Heartland Siding | Water - Pretreatment Renewal | Booneville | Prentiss |
| Producers Rice Mill Inc | Water - Pretreatment Renewal | Greenville | Washington |
| Producers Rice Mill Inc | Air - SMOP Renewal | Greenville | Washington |
| Puckett POTW | Water - NPDES Minor Municipal Renewal | Puckett | Rankin |
| Pursue Energy Corporation, Thomasville Gas Plant | Air - Title V Renewal | Brandon | Rankin |
| Purvis POTW | Water - NPDES Minor Municipal Renewal | Purvis | Lamar |
| Quality Utilities Inc, Forest Cove Subdivision | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Quantum Choctaw Power LLC | Air - Title V Minor Modification | Ackerman | Choctaw |
| Quantum Choctaw Power LLC | Water - State Operating Permit Renewal | Ackerman | Choctaw |
| RMW Commercial Park | Water - State Operating Permit Renewal | Meridian | Lauderdale |
| Rabbit Man Farms | Water - State Operating Permit Renewal | Sandy Hook | Marion |
| Rainbow Creations Inc | Air - Title V Renewal | Ridgeland | Madison |
| Rankin County Board of Supervisors, Erlich Road Project | Water Quality - 401 Certification | Florence | Rankin |
| Rawls Springs Utility District, Lakewood Estates Subdivision | Water - NPDES Commercial Renewal | Maybank | Forrest |
| Reckitt Benckiser Inc | Air - SMOP Renewal | Brandon | Rankin |
| Refuge Subdivision, The | Water Quality - 401 Certification | Hattiesburg | Lamar |
| Reichhold Inc, Gulfport | Hazardous Waste - TSD Post-Closure Renewal | Gulfport | Harrison |
| Renaissance Petroleum Company LLC, Anderson Tully 12-7 Number 1 Production Facility | Air - Construction Permit | Bay Springs | Jasper |
| Resinall Mississippi Inc | Air - SMOP Modification | Hattiesburg | Forrest |
| Resinall Mississippi Inc | Air - SMOP Modification | Hattiesburg | Forrest |
| Resolute FP US Inc, Grenada Operations | Water - NPDES Major Industrial Admin Mod | Grenada | Grenada |
| Resolute FP US Inc, Grenada Operations | Air - Title V Admin Mod | Grenada | Grenada |
| Rexam Beverage Can Company Inc | Air - Title V Renewal | Olive Branch | Desoto |
| Ridgeland Waste Disposal Inc, Ridgeland Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Riverbend Utilities, Windridge Subdivision | Water - State Operating Permit Renewal | Gulfport | Harrison |
| Riverwind Development, Riverwind West | Water Quality - 401 Certification | Flowood | Rankin |
| Robert E Smith Trailer Park | Water - State Operating Permit Renewal | Hattiesburg | Forrest |
| Robertson Utility of Oxford LLC, Edgewood Subdivision | Water - NPDES Commercial Renewal | Oxford | Lafayette |
| Rockett, Inc. | Air - Construction Permit Modification | Flowood | Rankin |
| Rockett, Inc. | Water - Pretreatment Modification | Flowood | Rankin |
| Rocky Creek Catfish Cottage | Water - State Operating Permit Renewal | Lucedale | George |
| Rolls Royce North America, Rolls Royce Center of Excellence | Air - Construction Permit | Stennis Space Center | Hancock |
| Roxul USA Inc | Air - Air-Construction PSD | Byhalia | Marshall |
| Russell Mobile Home Park | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| SEB Mining LLC, SEB Pit and SEB Class II Rubbish Site | Solid Waste - Rubbish | Vancleave | Jackson |
| SES Processing Facility | Solid Waste - Processing | Prentiss | Jefferson Davis |
| SG Resources, Mississippi LLC, Southern Pines Energy Center | Air - Title V Modification | Leakesville | Greene |
| Safari Properties USA LLC, Subdivision | Water Quality - 401 Certification | Hattiesburg | Lamar |
| Safety Kleen Systems Inc | Hazardous Waste - TSD Renewal | Jackson | Hinds |
| Saint Catherine Creek Campground | Water - NPDES Commercial Renewal | Natchez | Adams |
| Salem House Banquet and Reception Hall | Water - NPDES Commercial Renewal | Picayune | Pearl River |
| Salvation Army, The, Camp Hidden Lake | Water - NPDES Commercial Renewal | Lexington | Holmes |
| Sanderson Plumbing Products Inc | Water - NPDES Minor Industrial Renewal | Columbus | Lowndes |
| Sandstone Management LLC, Sandstone Subdivision | Water - NPDES Commercial Renewal | Sumrall | Lamar |
| Sansing Meat Service | Water - NPDES Minor Industrial Renewal | Maben | Choctaw |
| Sardis, Town of, Sardis Lake Development | Water - State Operating Permit Renewal | Sardis Lake | Panola |
| Sawmill Apartments | Water - State Operating Permit Renewal | Leakesville | Greene |
| Schulz Xtruded Products | Air - SMOP | Hernando | Desoto |
| Schulz Xtruded Products | Air - Construction Permit | Hernando | Desoto |
| Scott County Schools, Scott Central Attendance Center | Water - NPDES Commercial Renewal | Forest | Scott |
| Screw Conveyor Corporation | Air - SMOP Modification | Winona | Montgomery |
| Seal Investment Inc, Seals Marketplace | Water - NPDES Commercial Renewal | Picayune | Hancock |
| Senatobia POTW | Water - NPDES Major Municipal Renewal | Senatobia | Tate |
| Seneasha Air Service Inc | Water - State Operating Permit Renewal | Goodman | Attala |
| Severstal Columbus | Water - NPDES Minor Industrial Renewal | Columbus | Lowndes |
| Seymour and Sons Seafood Inc | Water - NPDES Minor Industrial Modification | D'Iberville | Harrison |
| Shady Grove Utility District, Hoy and Green Acres Subdivision | Water - NPDES Commercial Renewal | Laurel | Jones |
| Shady Nook Inc | Water - NPDES Commercial Renewal | Lyon | Coahoma |
| Shannon POTW | Water - NPDES Minor Municipal Renewal | Shannon | Lee |
| Shannon POTW | Water - NPDES Minor Municipal Renewal | Shannon | Lee |
| Shaws Car Wash | Water - State Operating Permit | Forest | Scott |
| Shuqualak POTW | Water - NPDES Minor Municipal Renewal | Shuqualak | Noxubee |
| Sienna Utilities LLC, Sienna Fields Subdivision | Water - State Operating Permit Renewal | Sumrall | Lamar |
| Silver Creek POTW | Water - NPDES Minor Municipal Renewal | Silver Creek | Lawrence |
| Simpson County School District, Simpson Central School | Water - NPDES Commercial Renewal | Pinola | Simpson |
| Sims Bark Company Inc | Water - NPDES Minor Industrial Renewal | Olive Branch | Desoto |
| Singing River Education Association, Benndale Headstart School | Water - State Operating Permit Renewal | Benndale | George |
| Smith and McInnis, Car Dealership | Water Quality - 401 Certification | Moss Point | Jackson |
| Smith and McInnis, Office Complex | Water Quality - 401 Certification | Moss Point | Jackson |
| Smithville POTW | Water - NPDES Minor Municipal Renewal | Smithville | Monroe |
| South Gate Sewer District | Water - NPDES Minor Municipal Renewal | Columbus | Lowndes |
| South Meridian Apartments | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| South Mississippi Electric Power Association, Batesville Generating Station | Air - Title V Renewal | Batesville | Panola |
| South Mississippi Electric Power Association, Batesville Generating Station | Air - Construction PSD modification | Batesville | Panola |
| South Mississippi Electric Power Association, Batesville Generating Station | Air - Air-Construction PSD Admin Mod | Batesville | Panola |
| South Mississippi Electric Power Association, Batesville Generating Station | Air - Title V Admin Mod | Batesville | Panola |
| South Mississippi Electric Power Association, Sylvarena Generating Plant | Water - NPDES Minor Industrial Renewal | Raleigh | Smith |
| South Mississippi Funeral Services LLC | Air - Construction Permit | Ellisville | Jones |
| Southeast Supply Header LLC, Collins Booster Station | Air - SMOP Renewal | Collins | Covington |
| Southeast Supply Header LLC, Gwinville Compressor Station | Air - Title V | Gwinville | Jefferson Davis |
| Southern Christian Services for Children and Youth Inc, Joe Rowland Therapeutic Group Home for Boys | Water - NPDES Commercial Renewal | Grenada | Grenada |
| Southern Ionics R and D Lab | Water - NPDES Minor Industrial Renewal | Columbus | Lowndes |
| Southern Lumber Company Inc, Hermanville | Water - NPDES Minor Industrial Renewal | Hermanville | Claiborne |
| Southern Natural Gas Company LLC, Bay Springs Compressor Station | Air - Title V Admin Mod | Bay Springs | Jasper |
| Southern Natural Gas Company LLC, Enterprise Compressor Station | Air - Construction Permit | Enterprise | Clarke |
| Southern Natural Gas Company LLC, Gwinville Compressor Station | Air - Title V Admin Mod | New Hebron | Jefferson Davis |
| Southern Natural Gas Company LLC, Louisville Compressor Station | Air - Title V Admin Mod | Louisville | Winston |
| Southern Natural Gas Company LLC, Onward Compressor Station | Air - Title V Admin Mod | Cary | Sharkey |
| Southern Natural Gas Company LLC, Pearl River Gas Turbine Station | Air - Title V Admin Mod | Foxworth | Walthall |
| Southern Natural Gas Company LLC, Pickens Compressor Station | Air - Title V Admin Mod | Pickens | Yazoo |
| Southern Natural Gas Company LLC, Pickens Compressor Station | Water - State Operating Permit Admin Mod | Pickens | Yazoo |
| Southern Natural Gas Company LLC, Rankin Compressor Station | Air - Title V Admin Mod | Brandon | Rankin |
| Southern Pine Electric Power Association, Corporate Headquarters | Water Quality - 401 Certification | Taylorsville | Smith |
| Southland Flying Service Inc | Water - State Operating Permit Renewal | Tchula | Holmes |
| Southwest Mississippi Community College POTW | Water - NPDES Minor Municipal Renewal | Summit | Pike |
| Southwest Mississippi Mental Health Foundation Inc, New Haven Recovery Center | Water - NPDES Commercial Renewal | Brookhaven | Lincoln |
| Steven W Rowley, Poultry and Dairy | Water - State Operating Permit Renewal | Foxworth | Marion |
| Stone County Board of Supervisors, Wire Road Bike Trail | Water Quality - 401 Certification | Perkinston | Stone |
| Structural Steel Services Inc, Plant 3 | Air - Title V Renewal | Meridian | Lauderdale |
| Structural Steel Services Inc, Plant 6 | Air - Title V Renewal | Meridian | Lauderdale |
| Structural Steel Services Inc, Plants 1 and 2 | Air - Title V Renewal | Meridian | Lauderdale |
| Sturdivant Brothers Flying Service Inc | Water - State Operating Permit Renewal | Glendora | Leflore |
| Summit POTW, East | Water - NPDES Minor Municipal Renewal | Summit | Pike |
| Summit POTW, North | Water - NPDES Minor Municipal Renewal | Summit | Pike |
| Summit POTW, South | Water - NPDES Minor Municipal Renewal | Summit | Pike |
| Sunflower Flying LLC | Water - State Operating Permit Renewal | Sunflower | Sunflower |
| Sunset Landing, LLC, Dry Dock Boat Storage | Water Quality - 401 Certification | Pass Christian | Harrison |
| Sunshine Mills Inc | Air - SMOP Renewal | Tupelo | Lee |
| Super 8 Motel | Water - NPDES Commercial Renewal | Tupelo | Lee |
| Superior Fish Products Inc | Water - NPDES Minor Industrial Renewal | Macon | Noxubee |
| Symonds Water Association Inc | Water - NPDES Minor Municipal Renewal | Symonds | Bolivar |
| Systems Electro Coating LLC | Water - Pretreatment Renewal | Madison | Madison |
| T and M Terminal Company | Water - NPDES Minor Industrial Renewal | Collins | Covington |
| TMJ LLC | Water - NPDES Commercial Renewal | Brandon | Rankin |
| Tate County School District, East Tate Elementary School | Water - NPDES Commercial Renewal | Coldwater | Tate |
| Tate County School District, Independence High School | Water - NPDES Commercial Renewal | Independence | Tate |
| Taylor Group Inc, The, Taylor Machine Works Inc, Philadelphia Operations | Air - SMOP Renewal | Philadelphia | Neshoba |
| Taylor Machine Works Inc | Air - SMOP Renewal | Louisville | Winston |
| Taylor Machine Works Inc, Plant Number 2 | Air - SMOP Renewal | Louisville | Winston |
| Taylor Machine Works Inc, Plant Number 3 | Air - SMOP Renewal | Louisville | Winston |
| Taylors Flying Service Inc | Water - State Operating Permit Renewal | Bolton | Hinds |
| Tegrant Diversified Brands Inc | Water - Pretreatment Renewal | Tupelo | Lee |
| Teikuro Corporation | Water - Pretreatment Renewal | Meridian | Lauderdale |
| Tellus Operating Group LLC, Hiwannee Plant | Water Quality - 401 Certification | Waynesboro | Wayne |
| Tellus Operating Group LLC, Hiwannee Plant | Air - Construction Permit | Waynesboro | Wayne |
| Tellus Operating Group LLC, Hiwannee Plant | Water Quality - 401 Certification | Waynesboro | Wayne |
| Tellus Operating Group, LLC, Well Site Locations and Pipeline Easements | Water Quality - 401 Certification | Raleigh | Smith |
| Tennessee Gas Pipeline Company LLC, Batesville Compressor Station Number 63 | Air - Title V Admin Mod | Batesville | Panola |
| Tennessee Gas Pipeline Company LLC, Bay St Louis Compressor Station Number 530 | Water - NPDES Minor Industrial Admin Mod | Bay St. Louis | Hancock |
| Tennessee Gas Pipeline Company LLC, Bay St Louis Compressor Station Number 530 | Air - Title V Admin Mod | Bay St. Louis | Hancock |
| Tennessee Gas Pipeline Company LLC, Columbus Compressor Station Number 546 | Air - Title V Admin Mod | Columbus | Lowndes |
| Tennessee Gas Pipeline Company LLC, Columbus Compressor Station Number 546 | Water - NPDES Minor Industrial Admin Mod | Columbus | Lowndes |
| Tennessee Gas Pipeline Company LLC, Columbus Compressor Station Number 546 | Air - Title V Renewal | Columbus | Lowndes |
| Tennessee Gas Pipeline Company LLC, Dekalb Compressor Station Number 542 | Water - NPDES Minor Industrial Admin Mod | Daleville | Kemper |
| Tennessee Gas Pipeline Company LLC, Dekalb Compressor Station Number 542 | Air - Title V Admin Mod | Daleville | Kemper |
| Tennessee Gas Pipeline Company LLC, Greenville Compressor Station Number 54 | Air - Title V Admin Mod | Greenville | Washington |
| Tennessee Gas Pipeline Company LLC, Heidelberg Compressor Station Number 538 | Air - Title V Admin Mod | Heidelberg | Jasper |
| Tennessee Gas Pipeline Company LLC, Heidelberg Compressor Station Number 538 | Air - Title V Renewal | Heidelberg | Jasper |
| Tennessee Gas Pipeline Company LLC, Isola Compressor Station Number 843 | Air - Title V Admin Mod | Isola | Humphreys |
| Tennessee Gas Pipeline Company LLC, Isola Compressor Station Number 843 | Water - State Operating Permit Admin Mod | Isola | Humphreys |
| Tennessee Gas Pipeline Company LLC, Purvis Compressor Station Number 534 | Air - Title V Admin Mod | Purvis | Forrest |
| Tennessee Gas Pipeline Company LLC, Purvis Compressor Station Number 534 | Air - Title V Renewal | Purvis | Forrest |
| Tennessee Gas Pipeline Company LLC, Purvis Compressor Station Number 534 | Water - NPDES Minor Industrial Admin Mod | Purvis | Forrest |
| Tennessee Gas Pipeline Company, New Albany Compressor Station Number 851 | Air - Title V Renewal | New Albany | Union |
| Terra Waste Services LLC Processing Facility | Solid Waste - Processing | Flowood | Rankin |
| Texas Eastern Transmission Corporation, Kosciusko Compressor Station Number 202 | Air - Title V Renewal | Kosciusko | Attala |
| Texas Eastern Transmission, Clinton Compressor Station | Air - Title V Renewal | Jackson | Hinds |
| Texas Gas Transmission LLC, Greenville Compressor Station | Air - Title V Renewal | Greenville | Washington |
|
| The Dirt Store at Williamson Nursery | Solid Waste - Composting ADMIN | Summit | Pike |
| The Dirt Store at Williamson Nursery | Solid Waste - Composting | Summit | Pike |
| Thigpen Septic Tank Company | Water - State Operating Permit Renewal | Picayune | Pearl River |
| Thurman Trailer Park | Water - NPDES Commercial Renewal | Carson | Jefferson Davis |
| Timber Products Company | Air - SMOP Renewal | Corinth | Alcorn |
| Tishomingo Acquisition LLC, dba TBEI, Tishomingo | Air - Title V Renewal | Tishomingo | Tishomingo |
| Tishomingo Acquisition LLC, dba TBEI, Tishomingo | Air - Title V Minor Modification | Tishomingo | Tishomingo |
| Topline Manufacturing Company Inc | Air - SMOP Renewal | Tremont | Itawamba |
| Total Environmental Solutions Inc, Greenbriar Subdivision | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Total Environmental Solutions Inc, Lake Village Estates and Windance | Water - NPDES Commercial Renewal | Gulfport | Harrison |
| Toyota Boshoku America | Air - SMOP Renewal | Mantachie | Itawamba |
| Toyota Motor Manufacturing Mississippi Inc | Air - Construction PSD modification | Blue Springs | Union |
| Traditions, A Division of Valley Services Inc | Water - Pretreatment | Pearl | Rankin |
| TransMontaigne Operating Company LP, Collins Piedmont Terminal Number 1 | Air - Title V Modification | Collins | Covington |
| TransMontaigne Operating Company LP, Greenville Clay Street | Water - NPDES Minor Industrial Renewal | Greenville | Washington |
| Travel Centers of America, Meridian Travel Center | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Tremont Development Group Inc, Hillsdale Apartments | Water - NPDES Commercial Renewal | Tremont | Itawamba |
| Trinity Yachts LLC | Water Quality - 401 Certification | Gulfport | Harrison |
| Triple C Trailers dba Sureride Trailers | Air - SMOP Renewal | Maben | Webster |
| Trunkline Gas Company, Independence Compressor Station | Air - Title V Renewal | Coldwater | Tate |
| Trunkline Gas Company, Shaw Compressor Station | Air - Title V Renewal | Shaw | Bolivar |
| US Army COE, East Bank Park | Water - State Operating Permit Renewal | Columbus | Lowndes |
| US Army COE, Mobile District, Biloxi Harbor Maintenance Dredging | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, Maintenance Dredging, Pascagoula Harbor Navigation Project | Water Quality - 401 Certification | Pascagoula | Jackson |
| US Army COE, Waverly Ferry Recreation Area | Water - State Operating Permit Renewal | West Point | Clay |
| US Government Printing Office, Secure Production Facility | Air - State Operating Permit Renewal | Stennis Space Center | Hancock |
| USA Yeast Company LLC | Water - Pretreatment Renewal | Hattiesburg | Forrest |
| USA Yeast Company LLC | Air - SMOP Renewal | Hattiesburg | Forrest |
| USDA Forest Service, Clear Springs Recreation Area | Water - NPDES Commercial Renewal | Bude | Franklin |
| USDA Forest Service, Clear Springs Recreation Area Dump Station | Water - NPDES Commercial Renewal | Bude | Franklin |
| USG Interiors LLC | Air - Title V Renewal | Greenville | Washington |
| Union For Reform Judaism, Henry S Jacobs Camp | Water - NPDES Commercial Renewal | Utica | Hinds |
| Union POTW | Water - NPDES Minor Municipal Renewal | Union | Newton |
| United Pentecostal Campground Church | Water - NPDES Commercial Renewal | Raymond | Hinds |
| United Pentecostal Campground Church | Water - NPDES Commercial Modification | Raymond | Hinds |
| University of Lil' Tots | Water - State Operating Permit Renewal | Vancleave | Jackson |
| Upward Properties LLC, Cottonwood Acres Mobile Home Park | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| VT Halter Marine, Pascagoula Operations | Water Quality - 401 Certification | Pascagoula | Jackson |
| Valley Air Applicators Inc | Water - State Operating Permit Renewal | Indianola | Sunflower |
| Vance Mobile Home Park | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Venture Oil and Gas Inc, Messer 1-12 Number 1 | Air - Construction Permit | Waynesboro | Wayne |
| Verona POTW | Water - NPDES Major Municipal Renewal | Verona | Lee |
| Vicksburg POTW | Water - NPDES Major Municipal Renewal | Vicksburg | Warren |
| Vicksburg Petroleum Products LLC | Water - NPDES Minor Industrial, NPDES Storm Renewal | Vicksburg | Warren |
| Vicksburg Petroleum Products LLC | Air - SMOP Renewal | Vicksburg | Warren |
| Vicksburg, City of, Vicksburg Biosolids Beneficial Application Sites | Solid Waste - Land Application Renewal | Redwood | Warren |
| Viking Range Corporation, Highway 82 West Site | Water - Pretreatment Renewal | Greenwood | Leflore |
| W E Blain and Sons Inc, Mount Olive Shop | Water - State Operating Permit | Mount Olive | Covington |
| W L Burle Engineers, MDOT/ Umoja Market Remediation Project | Water - Pretreatment | Greenwood | Leflore |
| WDAM License Subsidiary, WDAM TV | Water - State Operating Permit Renewal | Moselle | Jones |
| Wade Services | Water - Pretreatment Renewal | Laurel | Jones |
| Wal Mart Supercenter Number 3059 00 | Water Quality - 401 Certification | Canton | Madison |
| Walker Hill Environmental | Water - Pretreatment Renewal | Foxworth | Marion |
| Walker Properties | Water - State Operating Permit Renewal | Petal | Forrest |
| Wallace Ltd, Center Hill Downs Subdivision | Water - NPDES Commercial Renewal | Olive Branch | Desoto |
| Walnut Grove POTW | Water - NPDES Minor Municipal Renewal | Walnut Grove | Leake |
| Walnut POTW | Water - NPDES Minor Municipal Renewal | Walnut | Tippah |
| Walthall County Public Schools, Salem Attendance Center | Water - NPDES Commercial Renewal | Salem | Walthall |
| Warmkraft Inc | Water - Pretreatment Renewal | Taylorsville | Smith |
| Warren Inc | Air - SMOP Renewal | Collins | Covington |
| Warren Paving Inc, Gulfport Plant | Water Quality - 401 Certification | Gulfport | Harrison |
| Waste Management of Mississippi Inc, Pine Ridge Sanitary Landfill and Recycling Center | Water - NPDES Storm Renewal | Meridian | Lauderdale |
| Waste Management of Mississippi Inc, Pine Ridge Sanitary Landfill and Recycling Center | Air - Title V Renewal | Meridian | Lauderdale |
| Waste Management of Mississippi Inc, Pine Ridge Sanitary Landfill and Recycling Center | Water - Pretreatment Renewal | Meridian | Lauderdale |
| Waste Management of Mississippi Inc, Pine Ridge Sanitary Landfill and Recycling Center | Solid Waste - Mun Landfill Renewal | Meridian | Lauderdale |
| Waste Management of Mississippi Inc, Plantation Oaks Landfill and Recycling Center, Natchez Hauling | Solid Waste - Mun Landfill Renewal | Sibley | Adams |
| Waste Management of Mississippi Inc, Plantation Oaks Landfill and Recycling Center, Natchez Hauling | Air - Title V Renewal | Sibley | Adams |
| Waste Management of Mississippi Inc, Plantation Oaks Landfill and Recycling Center, Natchez Hauling | Water - NPDES Storm Renewal | Sibley | Adams |
| Wastequip Manufacturing Company LLC | Air - SMOP Admin Mod | Brookhaven | Lincoln |
| Water Way Inc | Air - Title V Renewal | Iuka | Tishomingo |
| Water Way Inc, Paul Edmondson Road Facility | Air - Title V Modification | Iuka | Tishomingo |
| Wayne County School District, Buckatunna Elementary | Water - NPDES Commercial Renewal | Buckatunna | Wayne |
| Wayne Farms LLC | Air - SMOP Renewal | Laurel | Jones |
| Waynesboro POTW | Water - NPDES Major Municipal Renewal | Waynesboro | Wayne |
| Weekend Cabin Inc, Circle 7 Compound | Water - State Operating Permit Renewal | McComb | Pike |
| Wendy Oaks R V Resort Inc | Water - NPDES Commercial Renewal | Florence | Rankin |
| West Point POTW, West | Water - NPDES Major Municipal Renewal | West Point | Clay |
| Westside Estates Homeowners Association | Water - NPDES Commercial Renewal | Brookhaven | Lincoln |
| Weyerhaeuser NR Company, Columbus Modified Fiber Facility | Water - Pretreatment Modification | Columbus | Lowndes |
| Weyerhaeuser NR Company, Philadelphia Facility | Water - Pretreatment Renewal | Philadelphia | Neshoba |
| Weyerhaeuser NR Company, Philadelphia Mississippi Facility | Water - NPDES Minor Industrial Renewal | Philadelphia | Neshoba |
| Whitneys Ridge at Oakfield | Water Quality - 401 Certification | Canton | Madison |
| Wilco Properties Inc, Avalon Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Wilco Properties Inc, Beersheba Hills Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Wilco Properties Inc, Cedarview Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Wilco Properties Inc, First Colony Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Wilco Properties Inc, LaBelle Estates Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Wilco Properties Inc, Prairie Waters Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Wilco Properties Inc, Sherwood Forest Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Wilco Properties Inc, Thornton Estates Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
|
| William Larry Currie, Curries Organic Poultry Compost | Solid Waste - Composting Renewal | Raleigh | Smith |
| Williams Equipment and Supply | Water - NPDES Minor Industrial Renewal | Shannon | Lee |
| Windsor Quality Food Company Ltd | Water - Pretreatment Renewal | Oakland | Yalobusha |
| Woodville, Town of, Wilkinson County Correctional Facility | Water - NPDES Commercial Renewal | Woodville | Wilkinson |
| Yalobusha County Board of Supervisors, Wastewater Treatment Facility | Water - State Operating Permit Renewal | Oakland | Yalobusha |
| Yazoo City POTW | Water - NPDES Major Municipal Renewal | Yazoo City | Yazoo |
|
| Yazoo County School District, Bentonia Gibbs School | Water - NPDES Commercial Renewal | Bentonia | Yazoo |
| Zeon Chemicals LP | Air - Construction PSD modification | Hattiesburg | Forrest |
| Zeon Chemicals LP | Air - Title V Renewal | Hattiesburg | Forrest |