PERMIT RATIONALE FOR REISSUANCE
Artesia POTW
Lowndes County
Artesia,, Mississippi
Water NPDES No. MS0020770
3/10/2026

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 lagoon followed by constructed wetlands.  No increase in flow is proposed within the application.  

IV.	RECEIVING WATERS – Unnamed Tributary of Catalpa Creek. The receiving waters are located within the Tombigbee River Basin, and are classified as Fish and Wildlife. Neither waterbody appears on the 303(d) list of impaired waterbodies. The discharge is included in a Fecal Coliform TMDL. The discharge is disinfected to comply with water quality standards for fecal coliform, which complies with the conditions 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, 0.1 MGD or 0.155 cfs
		 Qr = Receiving stream 7Q10, 0.0 cfs.

IWC = {(0.155 cfs)/(0.155 cfs + 0.0 cfs)}*100 = 100%

V.	APPLICABLE GUIDELINES – State of Mississippi Wastewater Regulations (11 MS admin code part 6), Municipal Facility Guidelines (Technology), Wasteload Allocation (WLA), Best Professional Judgment (BPJ)

VI.	SUMMARY OF LIMITATIONS –
Parameter				Flow					Basis
Flow					0.1 MGD				Design
BOD5					8 mg/l (Max Monthly Average)		WLA
BOD (Percent Removal)		85% Minimum				Technology
NH3-N					1 mg/l (Max Monthly Average)		WLA
TSS					90 mg/l (Max Monthly Average)	Technology
TSS (Percent Removal)			85% Minimum				Technology
E. Coli					126 Col./100 ml			11 MS admin code part6
Chlorine, Total Residual 		0.011 mg/l / 0.019 mg/l		11 MS admin code part6
Dissolved Oxygen 			6.0 mg/l Minimum			WLA
pH					6.0 – 9.0 SU			11 MS admin code part6
Total Nitrogen				Report (lbs/day)				WLA
Total Phosphorus			Report (lbs/day)				WLA

E. Coli will now be the bacterial indicator used for all freshwaters in MS designated as Recreation, Fish and Wildlife Support, and /or Public Water supply (replacing the use of fecal coliform).