PERMIT RATIONALE FOR REISSUANCE
Red River Utility Company, Ridge Park, Wakeland Hills and Wildwood Subdivisions
Hinds County
Jackson, Mississippi
Water NPDES No. MS0044792
March 21, 2019

I.	CLASSIFICATION – Domestic NPDES

II.	DESCRIPTION OF WASTEWATER – Minor Domestic

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated via an aerated lagoon.  

IV.	RECEIVING WATERS – Unnamed Tributary of Big Creek. Big Creek appears on the current state of Mississippi 303(d) list of impaired water bodies. The discharge also appears in a completed TMDL for nutrients and organic enrichment / low dissolved oxygen for Big Creek. Limitations were adjusted in the draft permit to comply with the conditions of the TMDL. This waterbody is in the Pearl River drainage basin, and is classified as Fish and Wildlife.

V.	APPLICABLE GUIDELINES – State of Mississippi Wastewater Regulations (11 MS admin code part 6),  State of Mississippi Water Quality Criteria (11 MS admin code part 6), Commercial Facility Guidelines, Total Maximum Daily Load (TMDL), Best Professional Judgment (BPJ)

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 

Parameter			Value						Basis
Flow				0.1144 MGD					Design
BOD				16 mg/l (Max Monthly Average)			TMDL
TSS				60 mg/l (Max Monthly Average)			Previous Permit
NH3-N				2 mg/l (Max Monthly Average)			TMDL
E. Coli				126 Col./100mL (Max Monthly Average)	WPC-2
pH				6.0 to 9.0 S.U.					WPC-2
Chlorine			0.1 to 1.0 mg/l					Previous Permit
Total Nitrogen			10 lbs/day (Max Monthly Average)		TMDL
Total Phosphorus		5 lbs/day (Max Monthly Average)		TMDL
Dissolved Oxygen		6.0 mg/l (Minimum)				TMDL

E. Coli will now be the bacterial indicator used for all freshwaters in MS designated as Recreation, Fish and Wildlife Support, and /or Public Water supply (replacing the use of fecal coliform).