PERMIT RATIONALE FOR REISSUANCE
Georgetown POTW
Copiah County
Georgetown, Mississippi
Water NPDES No. MS0020605
January 12, 2026

I.	CLASSIFICATION – NPDES Municipal Minor

II.	DESCRIPTION OF WASTEWATER – Domestic

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated via a two celled lagoon followed by chlorine disinfection prior to discharge. Only one discharge to surface waters is described within the application with no increase in treated effluent flow proposed. 

IV.	RECEIVING WATERS – 

The facility asked to relocate their discharge location directly to Pearl River instead of Unnamed Wetland adjacent to Pearl River. 

Outfall 001: Unnamed Wetland adjacent to Pearl River. The receiving waters are located in the Pearl River drainage basin and are classified as Fish and Wildlife. At the point of discharge, the receiving stream does not appear on the current State of Mississippi 303(d) List of Impaired Waterbodies.

At the point of discharge, the 7Q10 for the receiving stream is 0.08 cfs.  The instream wastewater concentration at the point of discharge can be determined by the following calculation:
IWC = {(Qw)/(Qw + Qr)}*100

	Where, Qw = Design flow of the wastewater treatment facility, 0.11 MGD or 0.17 cfs
		 Qr = Receiving stream 7Q10, 0.00 cfs.

IWC = {(0.17 cfs)/(0.17 cfs + 0.00 cfs)}*100 = 100%
	
Outfall 002: Discharge directly into the Pearl River. The receiving waters are located in the Pearl River drainage basin and are classified as Fish and Wildlife. At the point of discharge, the receiving stream does not appear on the current State of Mississippi 303(d) List of Impaired Waterbodies. Nutrient limits based on the April 2015 TMDL for the pearl River from Ross Barnett Reservoir to the Strong River. 

V.	APPLICABLE GUIDELINES – 11 Mississippi Admin Code pt. 6, Municipal Facility Guidelines (Technology), State of Mississippi Water Quality Criteria (MSWQS), Waste Load Allocation (WLA)

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 

Outfall 001- 

Parameter		Value				Basis
Flow			0.11 MGD		Design
BOD5			2 mg/l				WLA
NH3-N			1 mg/l				WLA
Dissolved Oxygen	≥ 6.0 mg/l		WLA
TSS 			90 mg/l 			Technology
E. coli			126 Col./100mL 	MSWQS
pH			6.0 to 9.0 S.U.	MSWQS
Chlorine		0.01-0.019 mg/l	MSWQS
Total Nitrogen		Report lbs./day	WLA
Total Phosphorus	Report lbs./day	WLA

Outfall 002- 

Parameter		Value				Basis
Flow			0.11 MGD		Design
BOD5			30 mg/l 			WLA
NH3-N			Report lbs. /day	WLA
Dissolved Oxygen	≥ 6.0 mg/l		WLA
TSS 			90 mg/l 			Technology
E. coli			126 Col./100mL 	MSWQS
pH			6.0 to 9.0 S.U.	MSWQS
Chlorine		1.0 mg/l (Maximum)	MSWQS
Total Nitrogen		10.6 lbs./day	WLA
Total Phosphorus	5.1 lbs./day		WLA

An Antidegradation was completed for this facility and the location for the new discharge point directly into the Pearl River has been approved by MDEQ. 
Georgetown POTW is moving their discharge location from Unnamed Wetland Adjacent to Pearl River to directly into the Pearl River. As soon as the construction for the new outfall (002) is done, outfall 001 will be terminated.