PERMIT RATIONALE FOR REISSUANCE
Lawrence County School District, Topeka Tilton Attendance Center
Lawrence County
Monticello,, Mississippi
Water NPDES No. MS0028240
January 2026

I.	CLASSIFICATION –Commercial NPDES Minor 

II.	DESCRIPTION OF WASTEWATER – Domestic Wastewater

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

IV.	RECEIVING WATERS – Unnamed Creek thence to East Topishaw Creek.  The receiving water is located within the Pearl River Basin, and is classified as Fish and Wildlife.  The receiving waters do not appear on the current State of Mississippi 303(d) list of impaired waterbodies. The discharge is listed in a pathogen TMDL. The discharge complies with the TMDL by disinfecting the effluent in order to comply with State criteria for pathogens (fecal coliform). The discharge is also listed in a completed TMDL for Mercury. The permittee detailed in a 2006 letter that no mercury sources were present at the campus. The discharge should not have a reasonable potential to contribute to the mercury load in the stream.

V.	APPLICABLE GUIDELINES – State of Mississippi Wastewater Regulations (11 Miss. Admin. Code Pt. 6, Ch. 1.),  State of Mississippi Water Quality Criteria (11 Miss. Admin. Code Pt. 6, Ch. 2.), Commercial Facility Guidelines (Technology)

VI.	SUMMARY OF LIMITATIONS –
Parameter			Value						Basis
Flow				0.01875 MGD					Design
BOD5				30 mg/l 					Technology
TSS				60 mg/l 					Technology
E. Coli				126 Col./100 ml 				MSWQS
Chlorine, Total Residual		0.1 – 1.0 SU					Technology
pH				6.0 – 9.0 SU					MSWQS

E. Coli will now be the bacterial indicator used for all freshwaters in MS designated as Recreation, Fish and Wildlife Support, and /or Public Water supply (replacing the use of fecal coliform).