PERMIT RATIONALE FOR REISSUANCE
Inverness POTW
Sunflower County
Inverness, Mississippi
Water NPDES No. MS0020320
March 26, 2026

I.	CLASSFICATION –  NPDES Municipal Minor

II.	DESCRIPTION OF WASTEWATER – Municipal Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Municipal wastewater is collected and treated biologically by means of a conventional lagoon followed by a storage cell. The system operates as a hydrographically controlled release (HCR). No increase in treated effluent flow proposed within the application.

IV.	RECEIVING WATERS – Mound Bayou. The receiving water is located in the Yazoo River drainage basin, and is classified as Fish & Wildlife.  At the point of discharge, the receiving stream does not appear on the current State of Mississippi 303(d) List of Impaired Waterbodies. The discharge is listed in a Fecal Coliform Total Maximum Daily Load (TMDL) for the Big Sunflower River (October 2003). The TMDL states that all NPDES permitted discharges should disinfect in order to meet water quality standards for pathogens. Pathogen and chlorine limitations have been added to the draft permit on accordance with the TMDL. The facility is also mentioned in an Organic Enrichment, Nutrients, and Sediment TMDL for the Big Sunflower River (June 2003). This TMDL does not establish a load allocation to the discharge. 

V.	APPLICABLE GUIDELINES – 11 Mississippi Admin Code Pt. 6, Total Maximum Daily Load (TMDL), Wasteload Allocation (WLA), Municipal Facility Guidelines (Technology), State of Mississippi Water Quality Standards (MSWQS)

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 
Parameter			Value			Basis
Flow				0.15 MGD			Design
BOD5				30 mg/l (Monthly Average)		WLA
TSS				90 mg/l (Monthly  Average)		Technology
pH				6.0 – 9.0 S.U.			MSWQS
Dissolved Oxygen		6.0 mg/l (Minimum)			WLA
E. coli				126 col/100ml			MSWQS, TMDL
Chlorine, Total Residual	0.011 mg/l			MSWQS
Ammonia Nitrogen		Report mg/l			WLA
Total Nitrogen			Report (lbs/day)			WLA
Total Phosphorus		Report (lbs/day)			WLA

Effluent shall not be discharged to the receiving stream when the stream flow is less than 10 cfs.