PERMIT RATIONALE FOR REISSUANCE
Jones County Schools, Shady Grove Attendance Center
Jones County
Laurel,, Mississippi
Water NPDES No. MS0031291
August 2026

I.	CLASSIFICATION – Commercial NPDES 

II.	DESCRIPTION OF WASTEWATER – Domestic Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Domestic wastewater is collected and treated biologically by means of an aerated lagoon followed by disinfection.  No increase in treated effluent flow is proposed within the application.  

IV.	RECEIVING WATERS – Unnamed creek thence into Tallahoma Creek.  The receiving waters are located within the Pascagoula River Basin and are classified as Fish and Wildlife.  At the point of discharge, the receiving stream appears on the 2026 State of Mississippi 303(d) list of evaluated or impaired waterbodies.  Specifically, waterbody ID 412811 is listed for biological impairment.  The listing starts with the confluence with Terrapin Creek and ends at the confluence with Horse Creek.  Only one discharge to surface waters is described within the application with no increase in treated effluent flow proposed. The discharge also appears on a completed TMDL for pathogens (December 1999).  The facility utilizes chlorine disinfection, which complies with the conditions of the TMDL. The existing discharge from this facility should not further impair water quality.  

V.	APPLICABLE GUIDELINES – 11 Mississippi Admin Code Pt. 6, Commercial Facility Guidelines (Technology), MS Water Quality Standards, Total Maximum Daily Load (TMDL)

VI.	CHANGES TO PREVIOUS PERMIT - E. coli has replaced fecal coliform as the bacterial indicator for all freshwaters in Mississippi designated as Recreation, Fish and Wildlife Support, and/or Public Water supply.

VII.	SUMMARY OF LIMITATIONS –

	Parameters				Value				Basis
	Flow					0.018 MGD			Design
	BOD5					30 mg/l (Yearly Avg.)		Technology
	TSS					90 mg/l (Yearly Avg.)		Technology
	E. coli					126 Col./100 ml		MS WQS
	Chlorine, Total Residual		0.1 – 1.0 mg/l 			Technology
pH							     6.0 – 9.0 SU			MS WQS