PERMIT RATIONALE FOR REISSUANCE
Simpson County School District, Simpson Central School
Simpson County
Pinola, Mississippi
Water NPDES No. MS0033626
January 2023

I.	CLASSIFICATION – Commercial NPDES 

II.	DESCRIPTION OF WASTEWATER – Domestic Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated by means of a conventional lagoon.  No increase in treated effluent flow is proposed within the application.  

IV.	RECEIVING WATERS – Unnamed creek thence into Strong River.  The receiving waters are located within the Pearl River Basin.  The unnamed creek is classified as Fish and Wildlife.  Strong River is classified as Recreational.  At the point of discharge the receiving stream does not appear on the most recent State of Mississippi 303(d) List of Impaired Waterbodies. However, the discharge does appear on Strong River Pathogen TMDL for Fecal Coliform. The facility utilizes Chlorine disinfection and complies with the TMDL. Only one discharge to surface waters is described within the application.

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

VI.	SUMMARY OF LIMITATIONS –
Parameter 			Value				Basis
	Flow				0.015 MGD			Design
	BOD5				30 mg/l			Technology
	TSS				90 mg/l 			Technology
	E. Coli				126 Col./100 ml		MSWQS
	Chlorine, Total Residual	0.1 – 1.0 mg/l 			Technology
	pH				6.0 – 9.0 SU			MSWQS

VII.	CHANGES FROM PREVIOUS PERMIT –

            No change