BUTLER WWTP
NPDES ID: IN0022462
X — SNC: Effluent violation (non-monthly average limit)
The facility discharged more of a pollutant than its permit allows, measured over a period other than a monthly average.
This quarter: 6 effluent violations.
Violations
May 31, 2026
Oxygen, dissolved [DO]
2% over limit
Discharged 5.9 mg/L against a permitted limit of 6 mg/L (DLYAVMIN)
DMR, Limited - Numeric Violation
April 30, 2026
Copper, total recoverable
105% over limit
Discharged 0.575672 kg/d against a permitted limit of 0.28148 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
54% over limit
Discharged 192 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Mercury, total recoverable
16% over limit
Discharged 0.00000279 mg/L against a permitted limit of 0.0000024 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
289% over limit
Discharged 913.9 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
8% over limit
Discharged 0.04 mg/L against a permitted limit of 0.037 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Oxygen, dissolved [DO]
28% over limit
Discharged 3.6 mg/L against a permitted limit of 5 mg/L (DLYAVMIN)
DMR, Limited - Numeric Violation
February 28, 2026
Mercury, total recoverable
23% over limit
Discharged 0.00000294 mg/L against a permitted limit of 0.0000024 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
12% over limit
Discharged 379.5 mg/L against a permitted limit of 340 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Solids, total suspended
23% over limit
Discharged 55.4 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Chloride [as Cl]
4% over limit
Discharged 354 mg/L against a permitted limit of 340 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Mercury, total recoverable
30% over limit
Discharged 0.00000311 mg/L against a permitted limit of 0.0000024 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Toxicity [acute], Ceriodaphnia dubia
0% over limit
Discharged 1 toxic against a permitted limit of 1 toxic (MAXIMUM)
DMR, Limited - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
Toxicity [chronic], Pimephales promelas [Fathead Minnow]
600% over limit
Discharged 7.7 toxic against a permitted limit of 1.1 toxic (MAXIMUM)
DMR, Limited - Overdue
Toxicity [chronic], Pimephales promelas [Fathead Minnow]
600% over limit
Discharged 7.7 toxic against a permitted limit of 1.1 toxic (MAXIMUM)
DMR, Limited - Numeric Violation
Toxicity [chronic], Ceriodaphnia dubia
600% over limit
Discharged 7.7 toxic against a permitted limit of 1.1 toxic (MAXIMUM)
DMR, Limited - Overdue
Toxicity [chronic], Ceriodaphnia dubia
600% over limit
Discharged 7.7 toxic against a permitted limit of 1.1 toxic (MAXIMUM)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Toxicity [acute], Pimephales promelas [Fathead Minnow]
160% over limit
Discharged 2.6 toxic against a permitted limit of 1 toxic (MAXIMUM)
DMR, Limited - Overdue
Toxicity [acute], Pimephales promelas [Fathead Minnow]
160% over limit
Discharged 2.6 toxic against a permitted limit of 1 toxic (MAXIMUM)
DMR, Limited - Numeric Violation
October 31, 2025
Mercury, total recoverable
31% over limit
Discharged 0.00000315 mg/L against a permitted limit of 0.0000024 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
September 30, 2025
E. coli, colony forming units [CFU]
631% over limit
Discharged 913.9 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
289% over limit
Discharged 913.9 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.59882599 kg/d against a permitted limit of 35.2303997 kg/d (DAILY MX)
DMR, Limited - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
Mercury, total recoverable
28% over limit
Discharged 0.00000308 mg/L against a permitted limit of 0.0000024 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
117% over limit
Discharged 2.6 mg/L against a permitted limit of 1.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
21% over limit
Discharged 0.023 mg/L against a permitted limit of 0.019 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
394% over limit
Discharged 15.3 mg/L against a permitted limit of 3.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
130% over limit
Discharged 0.085 mg/L against a permitted limit of 0.037 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
210% over limit
Discharged 387.3 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
48% over limit
Discharged 52.16459956 kg/d against a permitted limit of 35.2303997 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
3% over limit
Discharged 0.29056 kg/d against a permitted limit of 0.28148 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
45% over limit
Discharged 3.3 mg/L against a permitted limit of 6 mg/L (DLYAVMIN)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
65% over limit
Discharged 387.3 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
Mercury, total recoverable
22% over limit
Discharged 0.00000292 mg/L against a permitted limit of 0.0000024 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Oxygen, dissolved [DO]
8% over limit
Discharged 5.5 mg/L against a permitted limit of 6 mg/L (DLYAVMIN)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Copper, total recoverable
24% over limit
Discharged 0.348672 kg/d against a permitted limit of 0.28148 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
Chlorine, total residual
100% over limit
Discharged 0.02 mg/L against a permitted limit of 0.01 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Copper, total recoverable
19% over limit
Discharged 0.044 mg/L against a permitted limit of 0.037 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
4% over limit
Discharged 39.08939967 kg/d against a permitted limit of 37.50039968 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
5% over limit
Discharged 0.02 mg/L against a permitted limit of 0.019 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
Mercury, total recoverable
15% over limit
Discharged 0.00000276 mg/L against a permitted limit of 0.0000024 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Cyanide, free [as free]
9% over limit
Discharged 0.0740474 kg/d against a permitted limit of 0.0681 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
38% over limit
Discharged 4.56 mg/L against a permitted limit of 3.3 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
February 28, 2025
Mercury, total recoverable
22% over limit
Discharged 0.00000293 mg/L against a permitted limit of 0.0000024 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
11% over limit
Discharged 377.5 mg/L against a permitted limit of 340 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
202% over limit
Discharged 9.98 mg/L against a permitted limit of 3.3 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2024
Mercury, total recoverable
17% over limit
Discharged 0.0000028 mg/L against a permitted limit of 0.0000024 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Mercury, total recoverable
22% over limit
Discharged 0.00000293 mg/L against a permitted limit of 0.0000024 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
7% over limit
Discharged 364.8 mg/L against a permitted limit of 340 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Precipitation, monthly accumulation
0% over limit
Discharged 0.053956 in/d against a permitted limit of 0 in/d (MO TOTAL)
DMR, Monitor Only - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)