PERMIT RATIONALE FOR REISSUANCE
Rainbow Lakes Property Owners Association, Rainbow Lakes Subdivision
Lauderdale County
Toomsuba, Mississippi
Water NPDES No. MS0034843
May 2023

I.	CLASSIFICATION –Commercial NPDES

II.	DESCRIPTION OF WASTEWATER – Domestic 

III.	DESCRIPTION OF WASTEWATER TREATMENT – Wastewater is collected and treated by means of a conventional lagoon followed by chlorine disinfection.  No increase in flow is proposed within the application.

IV.	RECEIVING WATERS – Unnamed Tributary of Nanabe Creek.  The receiving water is located within the Pascagoula River Basin, and is classified as Fish and Wildlife.  Nanabe Creek does not appear on the current State of Mississippi 303(d) list of impaired waterbodies. The discharge appears on the TMDL established for Sowashee Creek for Organic Enrichment/Low DO, however the TMDL does not prescribe any further limitations for this facility. 

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				Flow					Basis
Flow					0.02 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 SU				Technology
pH					6.0 – 9.0 SU				MSWQS

VII.	CHANGES FROM PREVIOUS PERMIT-

No Change