PERMIT RATIONALE FOR REISSUANCE
Edwards POTW
Hinds County
Edwards, Mississippi
Water NPDES No. MS0062065
March 20, 2023

I.	CLASSIFICATION –Municipal NPDES Minor 

II.	DESCRIPTION OF WASTEWATER – Domestic / Municipal Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Wastewater is collected and treated by means of a 2-celled lagoon.  

IV.	RECEIVING WATERS – Big Black River. This waterbody does appear on the current State of Mississippi 303(d) list of impaired waterbodies. The discharge is listed in a pathogen TMDL. The facility disinfects the effluent in order to comply with State criteria for pathogens, which complies with the TMDL. All the limitations of the permit complies with the TMDL. The receiving water is located within the Big Black River Basin, and is classified as Fish and Wildlife. 

V.	APPLICABLE GUIDELINES – 11 MS admin code part 6

VI.	SUMMARY OF LIMITATIONS –
Parameter				Flow					Basis
Flow					0.46 MGD				Design
BOD5					30 mg/l (Max Monthly Average)	WLA
BOD (Percent Removal)		65% Minimum				40 CFR
TSS					90 mg/l (Max Monthly Average)	Technology
TSS (Percent Removal)			65% Minimum				40 CFR
E. Coli					126 Col./100 ml			11 ms admin code part 6
Chlorine, Total Residual	 	0.011 mg/l / 0.019 mg/l		11 MS admin code part 6
Dissolved Oxygen	 		6.0 Minimum				WLA
pH					6.0 – 9.0 SU			11 MS admin code part 6
NH3-N					Report mg/l (Max Monthly Average)	WLA
Total Nitrogen				Report (lbs/day)				WLA
Total Phosphorus			Report (lbs/day)				WLA