PERMIT RATIONALE FOR REISSUANCE
Hollandale POTW
Washington County
Hollandale, Mississippi
Water NPDES No. MS0055603
October 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 lagoon followed by chlorine disinfection, and dechlorination.  No increase in flow is proposed within the application.  

IV.	RECEIVING WATERS – Ditch thence into Black Bayou.  The receiving waters are located within the Yazoo River Basin and are classified as Fish and Wildlife.  Black Bayou, Waterbody ID# MS403E, in Washington County, does not appear on the current State of Mississippi 303(d) list of impaired waterbodies. It also appears on the TMDL for nutrients, organic enrichment/ low do, and sediment/ siltation. The limitations derived from the Wasteload Allocation meet the requirements of the TMDL. 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, 0.875 MGD or 1.356 cfs
		 Qr = Receiving stream 7Q10, 0.0 cfs.

IWC = {(1.356 cfs)/(1.356 cfs + 0.0 cfs)}*100 = 100 %

V.	APPLICABLE GUIDELINES – 11 Miss. Admin. Code Pt. 6, Municipal Guidelines (Technology), 2019 Wasteload Allocation (WLA)

VI.	SUMMARY OF LIMITATIONS –
Parameter			Flow				Basis
Flow				0.875 MGD			Design
BOD5				19 mg.l (Mo. Avg.)		WLA
NH3-N				2 mg/l (Mo. Avg)		WLA
Minimum DO			6 mg/l				Admin Code
E. Coli				126 Col./100 ml			Admin Code	
Chlorine, Total Residual	0.011 mg/l / 0.019mg/l		Admin Code & IWC
pH				6.0 – 9.0 SU			Admin Code
Total Nitrogen 			Report				WLA
Total Phosphorus		Report				WLA