CLARKSVILLE WWTP — NPDES permit IN0047058: limits, due date and EPA's record

NPDES permit IN0047058 · Major POTW · effective, expires 2028-06-30 · EPA's file as of 2026-09-19

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

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among IN permits in EPA's filings — check your permit).

Limits in force (35)

Outfall	Parameter	Statistic	Limit	Months
010	Oxygen, dissolved [DO]	DLYAVMIN	>= 6 mg/L	all year
010	pH	DAILY MN	>= 6 SU	all year
010	pH	DAILY MX	<= 9 SU	all year
010	Solids, total suspended	MO AVG	<= 12 mg/L	all year
010	Solids, total suspended	MX WK AV	<= 18 mg/L	all year
010	Solids, total suspended	MO AVG	<= 501 lb/d	all year
010	Solids, total suspended	MX WK AV	<= 751 lb/d	all year
010	Nitrogen, total [as N]	MO AVG	report only	all year
010	Nitrogen, total [as N]	MO AVG	report only	all year
010	Nitrogen, ammonia total [as N]	MO AVG	<= 1.1 mg/L	May, Jun, Jul, Aug, Sep, Oct, Nov
010	Nitrogen, ammonia total [as N]	MO AVG	<= 1.6 mg/L	Jan, Feb, Mar, Apr, Dec
010	Nitrogen, ammonia total [as N]	MX WK AV	<= 1.6 mg/L	May, Jun, Jul, Aug, Sep, Oct, Nov
010	Nitrogen, ammonia total [as N]	MX WK AV	<= 2.4 mg/L	Jan, Feb, Mar, Apr, Dec
010	Nitrogen, ammonia total [as N]	MO AVG	<= 46 lb/d	May, Jun, Jul, Aug, Sep, Oct, Nov
010	Nitrogen, ammonia total [as N]	MO AVG	<= 67 lb/d	Jan, Feb, Mar, Apr, Dec
010	Nitrogen, ammonia total [as N]	MX WK AV	<= 67 lb/d	May, Jun, Jul, Aug, Sep, Oct, Nov
010	Nitrogen, ammonia total [as N]	MX WK AV	<= 100 lb/d	Jan, Feb, Mar, Apr, Dec
010	Phosphorus, total [as P]	MO AVG	<= 1 mg/L	all year
010	Phosphorus, total [as P]	MO AVG	report only	all year
010	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
010	E. coli, colony forming units [CFU]	MO GEO	<= 125 CFU/100mL	Apr, May, Jun, Jul, Aug, Sep, Oct
010	E. coli, colony forming units [CFU]	DAILY MX	<= 235 CFU/100mL	Apr, May, Jun, Jul, Aug, Sep, Oct
010	Toxicity [acute], Ceriodaphnia dubia	MAXIMUM	<= 1 tox acute	Jan
010	Toxicity [acute], Ceriodaphnia dubia	MAXIMUM	<= 1 tox acute	Dec
010	Toxicity [chronic], Ceriodaphnia dubia	MAXIMUM	<= 1 tox chronic	Jan
010	Toxicity [chronic], Ceriodaphnia dubia	MAXIMUM	<= 1 tox chronic	Dec
010	Toxicity [acute], Pimephales promelas [Fathead Minnow]	MAXIMUM	<= 1 tox acute	Jan
010	Toxicity [acute], Pimephales promelas [Fathead Minnow]	MAXIMUM	<= 1 tox acute	Dec
010	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	MAXIMUM	<= 1 tox chronic	Jan
010	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	MAXIMUM	<= 1 tox chronic	Dec
010	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 10 mg/L	all year
010	BOD, carbonaceous [5 day, 20 C]	MX WK AV	<= 15 mg/L	all year
010	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 417 lb/d	all year
010	BOD, carbonaceous [5 day, 20 C]	MX WK AV	<= 626 lb/d	all year
010	Flow, total	MO TOTAL	report only	all year