Shelby County Government — NPDES permit TN0023833: limits, due date and EPA's record

NPDES permit TN0023833 · Minor POTW · effective, expires 2027-04-30 · EPA's file as of 2026-09-19

Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

Last period with anything received: 2026-07-31. Most often over: Nitrogen, ammonia total [as N] (2).

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (20)

Outfall	Parameter	Statistic	Limit	Months
001	Oxygen, dissolved [DO]	INST MIN	>= 6 mg/L	all year
001	pH	DAILY MN	>= 6 SU	all year
001	pH	DAILY MX	<= 9 SU	all year
001	Solids, total suspended	MO AVG	<= 30 mg/L	all year
001	Solids, total suspended	DAILY MX	<= 45 mg/L	all year
001	Solids, settleable	DAILY MX	<= 1 mL/L	all year
001	Nitrogen, total [as N]	ROLL AVG	<= 80.8 lb/yr	Mar, Jun, Sep, Dec
001	Nitrogen, ammonia total [as N]	MO AVG	<= .75 mg/L	May, Jun, Jul, Aug, Sep, Oct
001	Nitrogen, ammonia total [as N]	MO AVG	<= 1.4 mg/L	Jan, Feb, Mar, Apr, Nov, Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 4 mg/L	May, Jun, Jul, Aug, Sep, Oct
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 9.25 mg/L	Jan, Feb, Mar, Apr, Nov, Dec
001	Phosphorus, total [as P]	ROLL AVG	<= 161.7 lb/yr	Mar, Jun, Sep, Dec
001	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
001	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
001	Chlorine, total residual	MO AVG	<= .011 mg/L	all year
001	Chlorine, total residual	DAILY MX	<= .02 mg/L	all year
001	E. coli	GEO MEAN	<= 126 #/100mL	all year
001	E. coli	DAILY MX	<= 941 #/100mL	all year
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 20 mg/L	all year
001	BOD, carbonaceous [5 day, 20 C]	DAILY MX	<= 30 mg/L	all year