PERMIT RATIONALE FOR REISSUANCE
Mississippi State University, Central Mississippi Research and Extension Center
Hinds County
Raymond, Mississippi
Water NPDES No. MS0055921
October 20, 2025

I.	CLASSIFICATION –Commercial NPDES Minor 

II.	DESCRIPTION OF WASTEWATER – Domestic Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Wastewater is collected and treated by means of an aerobic treatment unit.  No increase in flow is proposed within the application.

IV.	RECEIVING WATERS – Snake Creek.  The receiving water is located within the Big Black River Basin, and is classified as Fish and Wildlife. Snake Creek does appear on the current State of Mississippi 303(d) list of impaired waterbodies for aquatic life support due to biological impairment. This permit can be reopened and modified if a completed TMDL requires additional or more stringent monitoring based on the listed impairment. The discharge is included in a pathogen TMDL. The discharge is required to comply with Mississippi Water Criteria for pathogens before discharging, which complies with the conditions of the TMDL. 

V.	APPLICABLE GUIDELINES – State of Mississippi Wastewater Regulations (11 MS admin code part 6),  State of Mississippi Water Quality Criteria, Commercial Facility Guidelines (Technology), Wasteload Allocation (WLA)

VI.	SUMMARY OF LIMITATIONS –
Parameter			Flow						Basis
Flow				0.0015	MGD					Design
BOD5				30 mg/l (Max Monthly Average)		Technology
TSS				30 mg/l (Max Monthly Average)		Technology
NH3				2.0 mg/l (Max Monthly Average)		TMDL
Total Nitrogen 			Report						TMDL
Total Phosphorus		Report 						TMDL
E. Coli				126 Col./100 ml (Max Monthly Avg.)		Admin code	
Chlorine, Total Residual	0.1 – 1.0 mg/l					Technology
Dissolved Oxygen		6.0 mg/l Minimum				Admin code
pH				6.0 – 9.0 SU					Admin code