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

Sewage treatment plant, major discharger, Butler, Indiana. NPDES permit IN0022462 expired Aug 31, 2026; its limits still apply. Last 12 months: over a limit 27 times (last August 2026), 6 required values missing, 9 of 40 reports late. Source: EPA ECHO, Oct 22, 2026.

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Limits in force (118)

Period ending	Outfall	Parameter	Reported	Limit	Over by
October 2025	002	Mercury, total recoverable, annual average	3.15 ng/L	≤ 2.4 ng/L	31%
November 2025	002	Toxicity [acute], Pimephales promelas [Fathead Minnow], maximum	2.6 tox acute	≤ 1 tox acute	160%
November 2025	002	Toxicity [acute], Pimephales promelas [Fathead Minnow], maximum	2.6 tox acute	≤ 1 tox acute	160%
November 2025	002	Toxicity [chronic], Ceriodaphnia dubia, maximum	7.7 tox chronic	≤ 1.1 tox chronic	600%
November 2025	002	Toxicity [chronic], Ceriodaphnia dubia, maximum	7.7 tox chronic	≤ 1.1 tox chronic	600%
November 2025	002	Toxicity [chronic], Pimephales promelas [Fathead Minnow], maximum	7.7 tox chronic	≤ 1.1 tox chronic	600%
November 2025	002	Toxicity [chronic], Pimephales promelas [Fathead Minnow], maximum	7.7 tox chronic	≤ 1.1 tox chronic	600%
December 2025	002	Chloride [as Cl], monthly average	354 mg/L	≤ 340 mg/L	4%
December 2025	002	Mercury, total recoverable, annual average	3.108 ng/L	≤ 2.4 ng/L	30%
December 2025	002	Solids, total suspended, maximum weekly average	55.4 mg/L	≤ 45 mg/L	23%
February 2026	002	Chloride [as Cl], monthly average	379.5 mg/L	≤ 340 mg/L	12%
February 2026	002	Mercury, total recoverable, annual average	2.94 ng/L	≤ 2.4 ng/L	23%
March 2026	002	Oxygen, dissolved [DO], daily average minimum	3.6 mg/L	≥ 5 mg/L	28%
April 2026	001	E. coli, colony forming units [CFU], daily maximum	913.9 CFU/100mL	≤ 235 CFU/100mL	289%
April 2026	001	E. coli, colony forming units [CFU], monthly geometric mean	192 CFU/100mL	≤ 125 CFU/100mL	54%
April 2026	002	Copper, total recoverable, daily maximum	.04 mg/L	≤ .037 mg/L	8%
April 2026	002	Copper, total recoverable, daily maximum	1.268 lb/d	≤ .62 lb/d	105%
April 2026	002	Mercury, total recoverable, annual average	2.79 ng/L	≤ 2.4 ng/L	16%
May 2026	002	Oxygen, dissolved [DO], daily average minimum	5.9 mg/L	≥ 6 mg/L	2%
June 2026	002	Oxygen, dissolved [DO], daily average minimum	5.3 mg/L	≥ 6 mg/L	12%
July 2026	002	Oxygen, dissolved [DO], daily average minimum	5.2 mg/L	≥ 6 mg/L	13%
August 2026	001	E. coli, colony forming units [CFU], daily maximum	2420 CFU/100mL	≤ 235 CFU/100mL	930%
August 2026	001	E. coli, colony forming units [CFU], monthly geometric mean	2420 CFU/100mL	≤ 125 CFU/100mL	1836%
August 2026	002	Chloride [as Cl], daily maximum	12539 lb/d	≤ 11000 lb/d	14%
August 2026	002	Chloride [as Cl], daily maximum	683 mg/L	≤ 680 mg/L	0%
August 2026	002	Chloride [as Cl], monthly average	354 mg/L	≤ 340 mg/L	4%
August 2026	002	Phosphorus, total percent removal, monthly average minimum	67.4 %	≥ 75 %	30%

Parameter	Statistic	Limit	Months	Outfall
pH	daily minimum	report only (SU)	all year	001
pH	daily maximum	report only (SU)	all year	001
Solids, total suspended	monthly average	report only (mg/L)	all year	001
Solids, total suspended	daily maximum	report only (mg/L)	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Chlorine, total residual	monthly average	≤ .01 mg/L	all year	001
Chlorine, total residual	daily maximum	< .06 mg/L	all year	001
E. coli, colony forming units [CFU]	monthly geometric mean	≤ 125 CFU/100mL	Apr–Oct	001
E. coli, colony forming units [CFU]	daily maximum	≤ 235 CFU/100mL	Apr–Oct	001
BOD, carbonaceous [5 day, 20 C]	monthly average	report only (mg/L)	all year	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	report only (mg/L)	all year	001
Flow, total	monthly total	report only (Mgal/mo)	all year	001
Oxygen, dissolved [DO]	daily average minimum	≥ 6 mg/L	May–Nov	002
Oxygen, dissolved [DO]	daily average minimum	≥ 5 mg/L	Jan, Feb, Mar, Apr, Dec	002
pH	daily minimum	≥ 6 SU	all year	002
pH	daily maximum	≤ 9 SU	all year	002
Solids, total suspended	monthly average	≤ 30 mg/L	Jan, Feb, Mar, Apr, Dec	002
Solids, total suspended	monthly average	≤ 24 mg/L	May–Nov	002
Solids, total suspended	maximum weekly average	≤ 45 mg/L	Jan, Feb, Mar, Apr, Dec	002
Solids, total suspended	maximum weekly average	≤ 36 mg/L	May–Nov	002
Solids, total suspended	monthly average	≤ 751.1 lb/d	Jan, Feb, Mar, Apr, Dec	002
Solids, total suspended	monthly average	≤ 600.8 lb/d	May–Nov	002
Solids, total suspended	maximum weekly average	≤ 1126.6 lb/d	Jan, Feb, Mar, Apr, Dec	002
Solids, total suspended	maximum weekly average	≤ 901.3 lb/d	May–Nov	002
Nitrogen, total [as N]	monthly average	report only (mg/L)	all year	002
Nitrogen, total [as N]	monthly average	report only (lb/d)	all year	002
Nitrogen, ammonia total [as N]	monthly average	≤ 1.2 mg/L	May–Nov	002
Nitrogen, ammonia total [as N]	monthly average	≤ 1.3 mg/L	Jan, Feb, Mar, Apr, Dec	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 3.1 mg/L	May–Nov	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 3.3 mg/L	Jan, Feb, Mar, Apr, Dec	002
Nitrogen, ammonia total [as N]	monthly average	≤ 30 lb/d	May–Nov	002
Nitrogen, ammonia total [as N]	monthly average	≤ 32.5 lb/d	Jan, Feb, Mar, Apr, Dec	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 77.6 lb/d	May–Nov	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 82.6 lb/d	Jan, Feb, Mar, Apr, Dec	002
Phosphorus, total [as P]	monthly average	≤ 1 mg/L	all year	002
Phosphorus, total [as P]	monthly average	report only (lb/d)	all year	002
Cyanide, free [as free]	monthly average	report only (mg/L)	all year	002
Cyanide, free [as free]	monthly average	≤ .0046 mg/L	all year	002
Cyanide, free [as free]	daily maximum	report only (mg/L)	all year	002
Cyanide, free [as free]	daily maximum	≤ .0092 mg/L	all year	002
Cyanide, free [as free]	monthly average	report only (lb/d)	all year	002
Cyanide, free [as free]	monthly average	≤ .077 lb/d	all year	002
Cyanide, free [as free]	daily maximum	report only (lb/d)	all year	002
Cyanide, free [as free]	daily maximum	≤ .15 lb/d	all year	002
Cyanide, free [as free]	monthly average	report only (mg/L)	all year	002
Cyanide, free [as free]	daily maximum	report only (mg/L)	all year	002
Chloride [as Cl]	monthly average	≤ 340 mg/L	all year	002
Chloride [as Cl]	daily maximum	≤ 680 mg/L	all year	002
Chloride [as Cl]	monthly average	≤ 5700 lb/d	all year	002
Chloride [as Cl]	daily maximum	≤ 11000 lb/d	all year	002
Chloride [as Cl]	monthly average	report only (mg/L)	all year	002
Chloride [as Cl]	daily maximum	report only (mg/L)	all year	002
Nickel, total recoverable	monthly average	report only (mg/L)	all year	002
Nickel, total recoverable	daily maximum	report only (mg/L)	all year	002
Nickel, total recoverable	monthly average	report only (lb/d)	all year	002
Nickel, total recoverable	daily maximum	report only (lb/d)	all year	002
Nickel, total recoverable	monthly average	report only (mg/L)	all year	002
Nickel, total recoverable	daily maximum	report only (mg/L)	all year	002
Cadmium, total recoverable	monthly average	≤ .0046 mg/L	all year	002
Cadmium, total recoverable	daily maximum	≤ .0093 mg/L	all year	002
Cadmium, total recoverable	monthly average	≤ .077 lb/d	all year	002
Cadmium, total recoverable	daily maximum	≤ .16 lb/d	all year	002
Cadmium, total recoverable	monthly average	report only (mg/L)	all year	002
Cadmium, total recoverable	daily maximum	report only (mg/L)	all year	002
Lead, total recoverable	daily maximum	report only (mg/L)	Mar, Jun, Sep, Dec	002
Lead, total recoverable	daily maximum	report only (mg/L)	Mar, Jun, Sep, Dec	002
Lead, total recoverable	daily maximum	report only (lb/d)	Mar, Jun, Sep, Dec	002
Lead, total recoverable	daily maximum	report only (lb/d)	Mar, Jun, Sep, Dec	002
Lead, total recoverable	daily maximum	report only (mg/L)	Mar, Jun, Sep, Dec	002
Lead, total recoverable	daily maximum	report only (mg/L)	Mar, Jun, Sep, Dec	002
Copper, total recoverable	monthly average	report only (mg/L)	all year	002
Copper, total recoverable	monthly average	≤ .019 mg/L	all year	002
Copper, total recoverable	daily maximum	report only (mg/L)	all year	002
Copper, total recoverable	daily maximum	≤ .037 mg/L	all year	002
Copper, total recoverable	monthly average	report only (lb/d)	all year	002
Copper, total recoverable	monthly average	≤ .32 lb/d	all year	002
Copper, total recoverable	daily maximum	report only (lb/d)	all year	002
Copper, total recoverable	daily maximum	≤ .62 lb/d	all year	002
Copper, total recoverable	monthly average	report only (mg/L)	all year	002
Copper, total recoverable	daily maximum	report only (mg/L)	all year	002
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	002
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	002
E. coli, colony forming units [CFU]	monthly geometric mean	≤ 125 CFU/100mL	Apr–Oct	002
E. coli, colony forming units [CFU]	daily maximum	≤ 235 CFU/100mL	Apr–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	annual average	≤ 2.4 ng/L	Feb, Apr, Jun, Aug, Oct, Dec	002
Mercury, total recoverable	daily maximum	report only (ng/L)	Feb, Apr, Jun, Aug, Oct, Dec	002
Mercury, total recoverable	daily maximum	report only (ng/L)	Feb, Apr, Jun, Aug, Oct, Dec	002
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 25 mg/L	Jan, Feb, Mar, Apr, Dec	002
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 20 mg/L	May–Nov	002
BOD, carbonaceous [5 day, 20 C]	maximum weekly average	≤ 40 mg/L	Jan, Feb, Mar, Apr, Dec	002
BOD, carbonaceous [5 day, 20 C]	maximum weekly average	≤ 30 mg/L	May–Nov	002
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 625.9 lb/d	Jan, Feb, Mar, Apr, Dec	002
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 500.7 lb/d	May–Nov	002
BOD, carbonaceous [5 day, 20 C]	maximum weekly average	≤ 1001.4 lb/d	Jan, Feb, Mar, Apr, Dec	002
BOD, carbonaceous [5 day, 20 C]	maximum weekly average	≤ 751.1 lb/d	May–Nov	002
Phosphorus, total percent removal	monthly average minimum	≥ 75 %	all year	002
Flow, total	monthly total	report only (Mgal/mo)	all year	002
Duration	monthly total	report only (hr/mo)	all year	003
Overflow volume [SS0 volume, CSO volume]	monthly total	report only (Mgal)	all year	003
Precipitation, monthly accumulation	monthly total	report only (in/mo)	all year	003
Discharge event observation [Visual Monitoring]	monthly total	report only (#/mo)	all year	003

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/IN0022462 · MCP: https://passage-data.com/mcp