PERMIT RATIONALE FOR REISSUANCE
Lurand Utility District
Coahoma County
Clarksdale, Mississippi
Water NPDES No. MS0045080
October 2025

I.	CLASSIFICATION –Municipal NPDES Minor 

II.	DESCRIPTION OF WASTEWATER –Municipal Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated via a 2-cell conventional lagoon. No increase in flow is proposed within the application.  

IV.	RECEIVING WATERS – Ditch thence to Big Sunflower River. Big Sunflower River does not appear on the current State of MS section 303(d) list of Impaired water bodies. The receiving waters are located within the Yazoo River Basin, and the ditch is classified as Ephemeral.  The discharge is list in a TMDL for Organic Enrichment, Nutrient, and Sediment in the Big Sunflower River. The TMDL does not call for any reductions or additional limits for the discharge. The discharge is listed in a pathogen TMDL. To comply with the TMDL the facility will be required by permit condition to comply with State criteria for pathogens (fecal coliform) before discharging to the receiving stream.

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, 0.02 MGD or 0.03 cfs
		 Qr = Receiving stream 7Q10, 0.0 cfs.
IWC = {(0.03 cfs)/(0.03 cfs + 0.0 cfs)}*100 = 100%

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 LIMITATIONS –
Parameter				Flow					Basis
Flow					0.02 MGD				Design
BOD5					45 mg/l					WLA
BOD (Percent Removal)		65% Minimum				Previous Permit
TSS					90 mg/l					Technology
TSS (Percent Removal)			65% Minimum				Previous Permit
E. Coli					126 Col./100 ml				WLA
Chlorine, Total Residual		0.011 mg/l / 0.019 mg/l			WLA
pH					6.0 – 9.0 SU				WLA
Total Nitrogen				Report (lbs/day)				WLA
Total Phosphorus			Report (lbs/day)				WLA

There were no changes from last reissuance.