BUTLER WWTP — NPDES permit IN0022462: limits, due date and EPA's record

NPDES permit IN0022462 · Major POTW · administratively continued, expires 2026-08-31 · EPA's file as of 2026-09-19

This permit expired on 2026-08-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

Last period with anything received: 2026-07-31. Most often over: E. coli, colony forming units [CFU] (4), Oxygen, dissolved [DO] (4), Mercury, total recoverable (4).

Reporting

Reports are due about 27 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (120)

Outfall	Parameter	Statistic	Limit	Months
001	pH	DAILY MN	report only	all year
001	pH	DAILY MX	report only	all year
001	Solids, total suspended	MO AVG	report only	all year
001	Solids, total suspended	DAILY MX	report only	all year
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	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	<= .01 mg/L	all year
001	Chlorine, total residual	DAILY MX	< .06 mg/L	all year
001	E. coli, colony forming units [CFU]	MO GEO	<= 125 CFU/100mL	Apr, May, Jun, Jul, Aug, Sep, Oct
001	E. coli, colony forming units [CFU]	DAILY MX	<= 235 CFU/100mL	Apr, May, Jun, Jul, Aug, Sep, Oct
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	report only	all year
001	BOD, carbonaceous [5 day, 20 C]	DAILY MX	report only	all year
001	Flow, total	MO TOTAL	report only	all year
002	Oxygen, dissolved [DO]	DLYAVMIN	>= 6 mg/L	May, Jun, Jul, Aug, Sep, Oct, Nov
002	Oxygen, dissolved [DO]	DLYAVMIN	>= 5 mg/L	Jan, Feb, Mar, Apr, Dec
002	pH	DAILY MN	>= 6 SU	all year
002	pH	DAILY MX	<= 9 SU	all year
002	Solids, total suspended	MO AVG	<= 30 mg/L	Jan, Feb, Mar, Apr, Dec
002	Solids, total suspended	MO AVG	<= 24 mg/L	May, Jun, Jul, Aug, Sep, Oct, Nov
002	Solids, total suspended	MX WK AV	<= 45 mg/L	Jan, Feb, Mar, Apr, Dec
002	Solids, total suspended	MX WK AV	<= 36 mg/L	May, Jun, Jul, Aug, Sep, Oct, Nov
002	Solids, total suspended	MO AVG	<= 751.1 lb/d	Jan, Feb, Mar, Apr, Dec
002	Solids, total suspended	MO AVG	<= 600.8 lb/d	May, Jun, Jul, Aug, Sep, Oct, Nov
002	Solids, total suspended	MX WK AV	<= 1126.6 lb/d	Jan, Feb, Mar, Apr, Dec
002	Solids, total suspended	MX WK AV	<= 901.3 lb/d	May, Jun, Jul, Aug, Sep, Oct, Nov
002	Nitrogen, total [as N]	MO AVG	report only	all year
002	Nitrogen, total [as N]	MO AVG	report only	all year
002	Nitrogen, ammonia total [as N]	MO AVG	<= 1.2 mg/L	May, Jun, Jul, Aug, Sep, Oct, Nov
002	Nitrogen, ammonia total [as N]	MO AVG	<= 1.3 mg/L	Jan, Feb, Mar, Apr, Dec
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 3.1 mg/L	May, Jun, Jul, Aug, Sep, Oct, Nov
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 3.3 mg/L	Jan, Feb, Mar, Apr, Dec
002	Nitrogen, ammonia total [as N]	MO AVG	<= 30 lb/d	May, Jun, Jul, Aug, Sep, Oct, Nov
002	Nitrogen, ammonia total [as N]	MO AVG	<= 32.5 lb/d	Jan, Feb, Mar, Apr, Dec
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 77.6 lb/d	May, Jun, Jul, Aug, Sep, Oct, Nov
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 82.6 lb/d	Jan, Feb, Mar, Apr, Dec
002	Phosphorus, total [as P]	MO AVG	<= 1 mg/L	all year
002	Phosphorus, total [as P]	MO AVG	report only	all year
002	Cyanide, free [as free]	MO AVG	report only	all year
002	Cyanide, free [as free]	MO AVG	<= .0046 mg/L	all year
002	Cyanide, free [as free]	DAILY MX	report only	all year
002	Cyanide, free [as free]	DAILY MX	<= .0092 mg/L	all year
002	Cyanide, free [as free]	MO AVG	report only	all year
002	Cyanide, free [as free]	MO AVG	<= .077 lb/d	all year
002	Cyanide, free [as free]	DAILY MX	report only	all year
002	Cyanide, free [as free]	DAILY MX	<= .15 lb/d	all year
002	Cyanide, free [as free]	MO AVG	report only	all year
002	Cyanide, free [as free]	DAILY MX	report only	all year
002	Chloride [as Cl]	MO AVG	<= 340 mg/L	all year
002	Chloride [as Cl]	DAILY MX	<= 680 mg/L	all year
002	Chloride [as Cl]	MO AVG	<= 5700 lb/d	all year
002	Chloride [as Cl]	DAILY MX	<= 11000 lb/d	all year
002	Chloride [as Cl]	MO AVG	report only	all year
002	Chloride [as Cl]	DAILY MX	report only	all year
002	Nickel, total recoverable	MO AVG	report only	all year
002	Nickel, total recoverable	DAILY MX	report only	all year
002	Nickel, total recoverable	MO AVG	report only	all year
002	Nickel, total recoverable	DAILY MX	report only	all year
002	Nickel, total recoverable	MO AVG	report only	all year
002	Nickel, total recoverable	DAILY MX	report only	all year
002	Cadmium, total recoverable	MO AVG	<= .0046 mg/L	all year
002	Cadmium, total recoverable	DAILY MX	<= .0093 mg/L	all year
002	Cadmium, total recoverable	MO AVG	<= .077 lb/d	all year
002	Cadmium, total recoverable	DAILY MX	<= .16 lb/d	all year
002	Cadmium, total recoverable	MO AVG	report only	all year
002	Cadmium, total recoverable	DAILY MX	report only	all year
002	Lead, total recoverable	DAILY MX	report only	Mar, Jun, Sep, Dec
002	Lead, total recoverable	DAILY MX	report only	Mar, Jun, Sep, Dec
002	Lead, total recoverable	DAILY MX	report only	Mar, Jun, Sep, Dec
002	Lead, total recoverable	DAILY MX	report only	Mar, Jun, Sep, Dec
002	Lead, total recoverable	DAILY MX	report only	Mar, Jun, Sep, Dec
002	Lead, total recoverable	DAILY MX	report only	Mar, Jun, Sep, Dec
002	Copper, total recoverable	MO AVG	report only	all year
002	Copper, total recoverable	MO AVG	<= .019 mg/L	all year
002	Copper, total recoverable	DAILY MX	report only	all year
002	Copper, total recoverable	DAILY MX	<= .037 mg/L	all year
002	Copper, total recoverable	MO AVG	report only	all year
002	Copper, total recoverable	MO AVG	<= .32 lb/d	all year
002	Copper, total recoverable	DAILY MX	report only	all year
002	Copper, total recoverable	DAILY MX	<= .62 lb/d	all year
002	Copper, total recoverable	MO AVG	report only	all year
002	Copper, total recoverable	DAILY MX	report only	all year
002	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
002	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
002	E. coli, colony forming units [CFU]	MO GEO	<= 125 CFU/100mL	Apr, May, Jun, Jul, Aug, Sep, Oct
002	E. coli, colony forming units [CFU]	DAILY MX	<= 235 CFU/100mL	Apr, May, Jun, Jul, Aug, Sep, Oct
002	Toxicity [acute], Ceriodaphnia dubia	MAXIMUM	<= 1 tox acute	Jun, Dec
002	Toxicity [acute], Ceriodaphnia dubia	MAXIMUM	<= 1 tox acute	Jun, Dec
002	Toxicity [acute], Ceriodaphnia dubia	MAXIMUM	<= 1 tox acute	May, Nov
002	Toxicity [acute], Ceriodaphnia dubia	MAXIMUM	<= 1 tox acute	May, Nov
002	Toxicity [chronic], Ceriodaphnia dubia	MAXIMUM	<= 1.1 tox chronic	Jun, Dec
002	Toxicity [chronic], Ceriodaphnia dubia	MAXIMUM	<= 1.1 tox chronic	Jun, Dec
002	Toxicity [chronic], Ceriodaphnia dubia	MAXIMUM	<= 1.1 tox chronic	May, Nov
002	Toxicity [chronic], Ceriodaphnia dubia	MAXIMUM	<= 1.1 tox chronic	May, Nov
002	Toxicity [acute], Pimephales promelas [Fathead Minnow]	MAXIMUM	<= 1 tox acute	Jun, Dec
002	Toxicity [acute], Pimephales promelas [Fathead Minnow]	MAXIMUM	<= 1 tox acute	Jun, Dec
002	Toxicity [acute], Pimephales promelas [Fathead Minnow]	MAXIMUM	<= 1 tox acute	May, Nov
002	Toxicity [acute], Pimephales promelas [Fathead Minnow]	MAXIMUM	<= 1 tox acute	May, Nov
002	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	MAXIMUM	<= 1.1 tox chronic	Jun, Dec
002	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	MAXIMUM	<= 1.1 tox chronic	Jun, Dec
002	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	MAXIMUM	<= 1.1 tox chronic	May, Nov
002	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	MAXIMUM	<= 1.1 tox chronic	May, Nov
002	Mercury, total recoverable	ANNL AVG	<= 2.4 ng/L	Feb, Apr, Jun, Aug, Oct, Dec
002	Mercury, total recoverable	DAILY MX	report only	Feb, Apr, Jun, Aug, Oct, Dec
002	Mercury, total recoverable	DAILY MX	report only	Feb, Apr, Jun, Aug, Oct, Dec
002	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 25 mg/L	Jan, Feb, Mar, Apr, Dec
002	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 20 mg/L	May, Jun, Jul, Aug, Sep, Oct, Nov
002	BOD, carbonaceous [5 day, 20 C]	MX WK AV	<= 40 mg/L	Jan, Feb, Mar, Apr, Dec
002	BOD, carbonaceous [5 day, 20 C]	MX WK AV	<= 30 mg/L	May, Jun, Jul, Aug, Sep, Oct, Nov
002	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 625.9 lb/d	Jan, Feb, Mar, Apr, Dec
002	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 500.7 lb/d	May, Jun, Jul, Aug, Sep, Oct, Nov
002	BOD, carbonaceous [5 day, 20 C]	MX WK AV	<= 1001.4 lb/d	Jan, Feb, Mar, Apr, Dec
002	BOD, carbonaceous [5 day, 20 C]	MX WK AV	<= 751.1 lb/d	May, Jun, Jul, Aug, Sep, Oct, Nov
002	Phosphorus, total percent removal	MO AV MN	>= 75 %	all year
002	Flow, total	MO TOTAL	report only	all year
003	Duration	MO TOTAL	report only	all year
003	Overflow volume [SS0 volume, CSO volume]	MO TOTAL	report only	all year
003	Precipitation, monthly accumulation	MO TOTAL	report only	all year
003	Discharge event observation [Visual Monitoring]	MO TOTAL	report only	all year