PERMIT RATIONALE FOR REISSUANCE
Woodland POTW
Chickasaw County
Woodland,, Mississippi
Water NPDES No. MS0051985
October 14, 2025

I.	CLASSIFICATION –Municipal NPDES Minor 

II.	DESCRIPTION OF WASTEWATER – Municipal Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Municipal wastewater is collected and treated by means of a conventional two-celled lagoon followed by disinfection.  No increase in flow is proposed within the application.  

IV.	RECEIVING WATERS – Cane Creek thence into Houlka Creek.  The receiving waters are located within the Tombigbee River Basin and are classified as Fish and Wildlife.  Cane Creek does appear on the updated State of Mississippi 303(d) list of evaluated or waterbodies, due to biological impairment. This permit can be reopened and modified if completed TMDL requires additional or more stringent monitoring based on the listed impairment. At the point of discharge the 7Q10 for the receiving stream is 0.3 cfs.  The instream wastewater concentration at the point of discharge can be determined by the following calculation:

IWC = {(Qw)/(Qw + Qr)}*100

	Where, Qw = Design flow of the wastewater treatment facility, 0.03 MGD or 0.047 cfs
		 Qr = Receiving stream 7Q10, 0.3 cfs.

IWC = {(0.047 cfs)/(0.047 cfs + 0.3 cfs)}*100 = 13.4 %

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.), Municipal Facility Guidelines, Wasteload Allocation (WLA)

VI	SUMMARY OF LIMITATIONS –

Parameter					Value				Basis
Flow						0.03	MGD			Design
BOD5						30 mg/l (Monthly Avg.)	WLA
TSS						90 mg/l (Monthly Avg.)	Technology
Ammonia Nitrogen 	Phase I			Report				WLA
Ammonia Nitrogen	Phase II		9 mg/l				WLA
Dissolved Oxygen 				6.0 mg/l			MSWQS
E. Coli		 				126 Col./100 ml		MSWQS
Chlorine, Total Residual			0.082 mg/l 			MSWQS and IWC
pH						6.0 – 9.0 SU			MSWQS

VI.	CHANGES FROM PREVIOUS PERMIT

The permit requires a reduction in ammonia nitrogen limitations to comply with the current ammonia toxicity standard. The reduction will be phased into the permit. The facility will be required to comply with phase 1 limitations upon issuance and must be in compliance with phase 2 limitations no later than 3 years after permit issuance. The facility is required to submit an engineering report 1 year after issuance. The report must detail how the facility will come into compliance with the reduced limitations.