PERMIT RATIONALE FOR REISSUANCE
Farrell Utility District, Farrell POTW
Coahoma County
Farrell, Mississippi
Water NPDES No. MS0045187
May 2025

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.  No increase in flow is proposed within the application.

IV.	RECEIVING WATERS – Ditch thence Overcup Slough. The receiving waters are located within the Yazoo River Basin, and the ditch is classified as Ephemeral.  Neither waterbody appears on the current State of Mississippi 303(d) list of impaired waterbodies. Discharge appears on 2003 Nutrient TMDL for Sunflower River.

At the point of discharge the 7Q10 for the receiving stream is 0.0 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, 0.03MGD or 0.047 cfs
		 Qr = Receiving stream 7Q10, 0.0 cfs.

IWC = {(0.047 cfs)/(0.047 cfs + 0.0 cfs)}*100 = 100%

V.	APPLICABLE GUIDELINES – 11 MS admin code part 6, Municipal Facility Guidelines (Technology), Wasteload Allocation (WLA), Best Professional Judgment (BPJ)

VI.	SUMMARY OF LIMITATIONS –
Parameter				Flow					Basis
Flow					0.03 MGD				Design
BOD5					6.0 mg/l (Max Monthly Average)	WLA
TSS					90 mg/l (Max Monthly Average)	Technology
E. Coli					126 Col./100 ml				WLA
Chlorine, Total Residual		0.011 mg/l / 0.019 mg/l			WLA
Dissolved Oxygen			6.0 Minimum				WLA
pH					6.0 – 9.0 SU				WLA
NH3-N					1.0 (Max Monthly Average) 		WLA
Total Nitrogen 				Report (lbs/day)				WLA
Total Phosphorus			Report (lbs/day)				WLA

There were no changes from last reissuance.