PERMIT RATIONALE FOR REISSUANCE
New Houlka POTW, West
Chickasaw County
New Houlka,, Mississippi
Water NPDES No. MS0025216
May 2026

I.	CLASSIFICATION – Municipal NPDES Minor

II.	DESCRIPTION OF WASTEWATER – Domestic/Municipal Wastewater

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

IV.	RECEIVING WATERS – Unnamed Tributary of Houlka Creek. At the point of discharge the receiving stream does not appear on the updated State of Mississippi 303(d) List of Impaired Waterbodies. The facility is mentioned in a Fecal Coliform TMDL for Tibbee Creek. The facility utilizes disinfection in order to comply with the TMDL. The receiving stream is located in the Yazoo River drainage basin, and is classified as Fish & Wildlife. At the point of discharge the 7Q10 for the receiving stream is 0.0 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, 0.2 MGD or 0.31 cfs
		 Qr = Receiving stream 7Q10, 0.0 cfs.

IWC = {(0.31 cfs)/(0.31 cfs + 0.0 cfs)}*100 = 100%

V.	APPLICABLE GUIDELINES – 11 Mississippi Admin. Code Pt. 6, Municipal Facility Guidelines (Technology), 2021 Wasteload Allocation (WLA), Total Maximum Daily Load (TMDL)

VI.	SUMMARY OF DISCHARGE LIMITATIONS – 
Parameter			Value			Basis
Flow				0.2 MGD			Design
BOD5				6 mg/l (Monthly Average)		WLA
BOD (Percent Removal)	65% Minimum			Technology
TSS				90 mg/l (Monthly Average)		Technology
TSS (Percent Removal)		65% Minimum			Technology
E. Coli				126 Col./100ml			Admin Code
Chlorine, Total Residual	0.011 – 0.019 mg/l			Admin Code
Dissolved Oxygen		6.0 mg/l Minimum			WLA
pH				6.0 – 9.0 S.U.			Admin Code
NH3-N				1 mg/l (Monthly Average)		WLA
Total Nitrogen 			Report mg/l			WLA
	Total Phosphorus		Report mg/l				WLA

VII.	CHANGES TO PREVIOUS PERMIT

Bacteria indicator for pathogens has been updated from Fecal Coliform to E. Coli. Numeric Limitations have been updated to reflect this change. 

Nutrient Reporting requirements (for Total Nitrogen and Total Phosphorus) have been added to the permit.