PERMIT RATIONALE FOR REISSUANCE
Nicholson Water and Sewer Association Inc.
Pearl River County
Nicholson, Mississippi
Water NPDES No. MS0033871
January 2018

I.	CLASSIFICATION – NPDES Commercial

II.	DESCRIPTION OF WASTEWATER – Domestic Wastewater

III.	DESCRIPTION OF WASTEWATER TREATMENT - Domestic wastewater is collected and treated biologically by means of an aerated lagoon.  Only one discharge to surface waters is described in the application with no increase in treated effluent flow proposed. 

IV.	RECEIVING WATERS – Unnamed tributary thence into McCall River.  The receiving waters are located within Pearl River Basin and are classified as Fish and Wildlife. At the point of discharge, the receiving stream does not appear on the current State of Mississippi 303 (d) List of Evaluated or Impaired Waterbodies, nor does the discharge appear on any completed Total Maximum Daily Loads (TMDLs). 

V.	APPLICABLE GUIDELINES – 11 Mississippi Admin Code pt. 6, Wasteload Allocation (WLA), Commercial Facility Guidelines (Technology)

VI.	SUMMARY OF LIMITATIONS –

Parameter			Value	Basis
Flow				0.18 MGD	Design
BOD5				24 mg/l	WLA
TSS				60 mg/l	Technology
NH3-N				2 mg/l 	WLA
Minimum DO			6.0 mg/l		WLA
Chlorine, Total Residual	0.011 mg/l 	WLA
E. coli				126 Col./100 ml	Admin Code
pH				6.0 – 9.0 SU		Admin Code

VII.	CHANGES FROM PREVIOUS PERMIT

E. coli has replaced fecal coliform as the bacterial indicator for all freshwaters in Mississippi designated as Recreation, Fish and Wildlife Support, and/or Public Water supply.