PERMIT RATIONALE FOR REISSUANCE
Chukstop, Inc., Carwash
Hinds County
Jackson, Mississippi
Water NPDES No. MS0061581
December 1, 2025

I.	NATURE OF BUSINESS

Chukstop, Inc., Carwash operates an unmanned commercial car wash facility in Hinds County. This operation currently discharges directly into Lynch Creek. 

II.	EFFLUENT AND RECEIVING STREAM FLOW DATA

Chuckstop, Inc., Carwash discharges 1,000 gallons per day of treated carwash effluent through an existing outfall into Lynch Creek which is located in the Pearl River drainage basin and classified as Fish and Wildlife.

III.	303(d) and TOTAL MAXIMUM DAILY LOADS (TMDLs) ISSUES

Lynch Creek appears on Mississippi’s current Section 303(d) List of Impaired Water Bodies for impaired Aquatic Life Use Support due to Biological Impairment. The permit complies with the following TMDLs:

•	Total Maximum Daily Load Designated Streams in the Pearl River Basin for Impairment Due to Sediment (TMDL ID 509032501; March 2009).
•	Fecal Coliform TMDL for Segments of the Pearl River, the Strong River, Halls Creek, and Pretty Branch Pearl River Basin (January 2012).
•	Fecal Coliform TMDL for Pearl River Pearl River Basin, Hinds County, Mississippi (TMDL ID 599121502; December 1999).
•	Fecal Coliform TMDL for Pearl River Pearl River Basin, Hancock County, Mississippi (TMDL ID 500121503; December 2000).
•	Total Maximum Daily Load Total Nitrogen and Total Phosphorus For the Pearl River Pearl River Basin (June 2009).
•	TMDL For Low pH in the Pearl River Pearl River Basin Neshoba, Leake, Hinds, Rankin, & Hancock Counties, Mississippi (TMDL ID 500121501; December 2000).
•	Fecal Coliform TMDL for Pearl River Pearl River Basin, Marion County, Mississippi (TMDL ID 500121502; December 2000).
•	Total Maximum Daily Load For The Legacy Pesticides, DDT and Toxaphene, In The Pearl River, South Independent Streams, And Lower Mississippi River Basins (TMDL ID 507010401; January 2007).

IV.	TYPE OF WASTEWATER TREATMENT

Process wastewater is treated by sedimentation traps and an oil/water separator. 

V.	EPA APPLICABLE CATEGORIAL GUIDELINES

None.

VI.	DATA FROM MISSISSIPPI SMALL DOMESTIC NPDES APPLICATION

Application testing waiver was requested and approved.

VII.	PROPOSED FINAL LIMITATIONS

Outfall 001
Parameter	Current Permit Limit (CPL)	Present Permit Limit (PPL)	Basis	
	Average	Maximum	Average	Maximum		
Flow	-----	0.001 MGD	-----	0.001 MGD	Design	
pH	6.0 SU (min)	9.0 SU	6.0 SU (min)	9.0 SU	MSWQS	
Oil and Grease	10 mg/L	15 mg/L	10 mg/L	15 mg/L	1/	
Total Suspended Solids 	30 mg/L	45 mg/L	30 mg/L	45 mg/L	1/	

MSWQS = Mississippi Water Quality Standards

1/Proposed permit limits for Oil and Grease and Total Suspended Solids are comparable to limits placed in permits held by existing similar commercial car wash facilities in the State of Mississippi.  

Effluent Limits have been developed such that the waste treatment system should protect water quality.  However, this permit is subject to modification if future evidence, monitoring results, or nuisance conditions indicate a higher degree of treatment is required to maintain water quality in the receiving stream.