PERMIT RATIONALE FOR REISSUANCE
South Centreville Water Association Inc, Rolling Hills Subdivision
Wilkinson County
Centreville, Mississippi
Water NPDES No. MS0033405
5/10/23

I.	CLASSIFICATION – Domestic NPDES

II.	DESCRIPTION OF WASTEWATER – Minor Domestic

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated via a conventional lagoon.  

IV.	RECEIVING WATERS – A Ditch thence into Thompson’s Creek.  Thompson’s Creek does not appear on the current 303(d) List of Impaired. The discharge is not listed in a completed TMDL. This waterbody is in the South Independent Streams River drainage basin. Thompson’s Creek is classified as Fish and Wildlife.  One discharge to surface waters is described within the application with no increase in flow proposed. The discharge from this facility should not further impair water quality.

V.	APPLICABLE GUIDELINES – State of Mississippi Wastewater Regulations (11 admin code Part 6 Chapter 1), State of Mississippi Water Quality Criteria, Commercial Facility Guidelines

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 

Parameter		Value					Basis
Flow			0.018 MGD				Design
BOD			30 mg/l (Yearly Average)		Domestic Guidelines
TSS			90 mg/l (Yearly Average)		Domestic Guidelines
E. Coli			126 Col./100mL (Yearly Average)	Domestic Guidelines
Effluent pH		6.0 to 9.0 S.U.				MS WQS
Chlorine		0.1 to 1.0 mg/l				MS WQS

VII.	CHANGES FROM PREVIOUS PERMIT-

None