PERMIT RATIONALE FOR REISSUANCE
Goodman POTW
Holmes County
Goodman, Mississippi
Water NPDES No. MS0026921
September 2025

I.	CLASSIFICATION –Municipal NPDES Minor 

II.	DESCRIPTION OF WASTEWATER – Domestic/ Municipal Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT – Municipal wastewater is collected and treated by means of a multiple cell lagoon.  No increase in flow is proposed within the application.  

IV.	RECEIVING WATERS – Big Black.  The receiving water is located within the Big Black River Basin, and is classified as Fish and Wildlife.  At the point of discharge the Big Black River appears on the current State of Mississippi 303(d) List of Impaired Waterbodies for Biological Impairment. The discharge is listed in Completed TMDLs for Fecal Coliform and low PH in the Big Black River. The TMDL does not propose any additional limits on the facility. At the point of discharge the 7Q10 for the receiving stream is 37 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, 0.28 MGD or 0.446 cfs
		 Qr = Receiving stream 7Q10, 37 cfs.

IWC = {(0.446 cfs)/(0.446 cfs + 37 cfs)}*100 = 1.19%

V.	APPLICABLE GUIDELINES – 11 MS Admin Code pt. 6, Wasteload Allocation (WLA)

VI.	SUMMARY OF LIMITATIONS –
Parameter				Flow				Basis
Flow					0.288 MGD			Design
BOD5					30 mg/l 				WLA
BOD (Percent Removal)			65% Minimum			Technology
TSS					90 mg/l (Monthly Average)	Technology
	e Coli					126 Col./100 ml			WLA
Chlorine, Total Residual 			0.92 mg/l (Monthly Average)	WLA	
Dissolved Oxygen			6.0 (Minimum)			WLA
pH					6.0 – 9.0 SU			WLA
Ammonia Nitrogen			REPORT			WLA