PERMIT RATIONALE FOR REISSUANCE
Flora POTW
Madison County
Flora, Mississippi
Water NPDES No. MS0025119
February 2025

I.	CLASSIFICATION – Municipal Minor NPDES

II.	DESCRIPTION OF WASTEWATER – Municipal Minor Domestic

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated via a 2-cell aerated lagoon followed by two sand filters.

IV.	RECEIVING WATERS – Town Creek. Town Creek, at the point of discharge, does not appear on the current State of Mississippi  List of Impaired Waterbodies.  This discharge is listed in the Pathogen TMDL.  As permitted this facility will comply with the conditions of the TMDL. This waterbody is in the Pearl River drainage basin. Town Creek is classified as Fish and Wildlife.

At the point of discharge the 7Q10 for the receiving stream is 0.09 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, 0.3 MGD or 0.46 cfs
		 Qr = Receiving stream 7Q10, 66 cfs.

IWC = {(0.46 cfs)/(0.46 cfs + 66 cfs)}*100 = 0.70 %

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

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 

Parameter		Value					Basis
Flow			0.3 MGD				Design
BOD			10 mg/l 				WLA
TSS			30 mg/l 				Technology
E. Coli 		126/410 col./100ml 			MSWQS
Dissolved Oxygen	>6.0 mg/l 				WLA
pH			6.0 to 9.0 S.U.				WLA
Chlorine		0.013 mg/l 				Previous
0.016 mg/l				Previous
NH3-N			Report mg/l				WLA
Total Nitrogen		Report					WLA
	Total Phosphorus	   Report					WLA

VII.	CHANGES FROM LAST REISUANCE-	

There were no changes