THORNTOWN WWTP
NPDES ID: IN0024589
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: 4 effluent violations.
Violations
May 31, 2026
Copper, total recoverable
174% over limit
Discharged 0.269 mg/L against a permitted limit of 0.098 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
71% over limit
Discharged 0.084 mg/L against a permitted limit of 0.049 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Copper, total recoverable
10% over limit
Discharged 0.054 mg/L against a permitted limit of 0.049 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
154% over limit
Discharged 0.249 mg/L against a permitted limit of 0.098 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
BOD, carbonaceous [5 day, 20 C]
124% over limit
Discharged 89.78 mg/L against a permitted limit of 40 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
5% over limit
Discharged 26.2 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
5% over limit
Discharged 39.45986367 kg/d against a permitted limit of 37.68199968 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
January 31, 2026
Copper, total recoverable
35% over limit
Discharged 0.132 mg/L against a permitted limit of 0.098 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Copper, total recoverable
192% over limit
Discharged 0.143 mg/L against a permitted limit of 0.049 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
327% over limit
Discharged 0.418 mg/L against a permitted limit of 0.098 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2025
BOD, carbonaceous [5 day, 20 C]
583% over limit
Discharged 273 mg/L against a permitted limit of 40 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Chlorine, total residual
183% over limit
Discharged 0.17 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
113% over limit
Discharged 53.2 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Chlorine, total residual
17% over limit
Discharged 0.07 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
BOD, carbonaceous [5 day, 20 C]
64% over limit
Discharged 65.5 mg/L against a permitted limit of 40 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Chlorine, total residual
17% over limit
Discharged 0.07 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
Chlorine, total residual
400% over limit
Discharged 0.3 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Solids, total suspended
0% over limit
Discharged 7.8 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 2.5 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 16.12063186 kg/d against a permitted limit of 42.67599964 kg/d (MX WK AV)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0.86627739 kg/d against a permitted limit of 23.6079998 kg/d (MO AVG)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 2.97 mg/L against a permitted limit of 40 mg/L (MX WK AV)
DMR, Limited - Overdue
Copper, total recoverable
0% over limit
Discharged 0.17 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 1.01877599 kg/d against a permitted limit of 37.68199968 kg/d (MX WK AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 2.98922677 kg/d against a permitted limit of 28.60199976 kg/d (MO AVG)
DMR, Limited - Overdue
Copper, total recoverable
0% over limit
Discharged 0.1299 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 9.54852792 kg/d against a permitted limit of 10.44199991 kg/d (MX WK AV)
DMR, Limited - Overdue
E. coli, colony forming units [CFU]
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
106% over limit
Discharged 22.25 mg/L against a permitted limit of 10.8 mg/L (MX WK AV)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
106% over limit
Discharged 22.25 mg/L against a permitted limit of 10.8 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.09552 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Copper, total recoverable
0% over limit
Discharged 0.03 mg/L against a permitted limit of 0.049 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, total recoverable
0% over limit
Discharged 0.03 mg/L against a permitted limit of 0.098 mg/L (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 8.4 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.1 SU against a permitted limit of 6 SU (DAILY MN)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 6.09222595 kg/d against a permitted limit of 6.80999994 kg/d (MO AVG)
DMR, Limited - Overdue
Flow, total
0% over limit
Discharged 0.09741691 MGD against a permitted limit of 0 MGD (MO TOTAL)
DMR, Monitor Only - Overdue
E. coli, colony forming units [CFU]
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 37 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
141% over limit
Discharged 17.33 mg/L against a permitted limit of 7.2 mg/L (MO AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
141% over limit
Discharged 17.33 mg/L against a permitted limit of 7.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
14% over limit
Discharged 12.3 mg/L against a permitted limit of 10.8 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
November 30, 2024
Nitrogen, ammonia total [as N]
136% over limit
Discharged 17 mg/L against a permitted limit of 7.2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)