ORWELL WWTP
NPDES ID: OH0026913
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
This quarter: 3 effluent violations.
Violations
June 30, 2026
Mercury, total low level
174% over limit
Discharged 0.00000631 mg/L against a permitted limit of 0.0000023 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2026
Nitrogen, ammonia total [as N]
154% over limit
Discharged 2.54 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
226% over limit
Discharged 4.89 mg/L against a permitted limit of 1.5 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
March 31, 2026
Mercury, total low level
55% over limit
Discharged 0.00000356 mg/L against a permitted limit of 0.0000023 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Copper, total recoverable
7% over limit
Discharged 0.0214 mg/L against a permitted limit of 0.02 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
E. coli, MTEC-MF
2629% over limit
Discharged 7750 MPN/100mL against a permitted limit of 284 MPN/100mL (WK GEOMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
570% over limit
Discharged 6.7 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
124% over limit
Discharged 282 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
45% over limit
Discharged 4.27 kg/d against a permitted limit of 2.95 kg/d (WKLY MAX)
DMR, Limited - Numeric Violation
Mercury, total low level
97% over limit
Discharged 0.00000452 mg/L against a permitted limit of 0.0000023 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1313% over limit
Discharged 21.2 mg/L against a permitted limit of 1.5 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
August 31, 2025
E. coli, MTEC-MF
Limit violation
Discharged 0 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
Limit violation
Discharged 0 MPN/100mL against a permitted limit of 284 MPN/100mL (WK GEOMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
383% over limit
Discharged 7.24 mg/L against a permitted limit of 1.5 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
91% over limit
Discharged 1.91 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
687% over limit
Discharged 11.8 mg/L against a permitted limit of 1.5 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
98% over limit
Discharged 249 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
3% over limit
Discharged 12.9 mg/L against a permitted limit of 12.5 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
174% over limit
Discharged 2.74 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
12% over limit
Discharged 8.43 mg/L against a permitted limit of 7.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
364% over limit
Discharged 13.7 kg/d against a permitted limit of 2.95 kg/d (WKLY MAX)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
123% over limit
Discharged 632 MPN/100mL against a permitted limit of 284 MPN/100mL (WK GEOMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
59% over limit
Discharged 3.13 kg/d against a permitted limit of 1.97 kg/d (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
E. coli, MTEC-MF
Limit violation
Discharged 0 MPN/100mL against a permitted limit of 284 MPN/100mL (WK GEOMN)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
Limit violation
Discharged 0 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
28% over limit
Discharged 1.28 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
141% over limit
Discharged 3.61 mg/L against a permitted limit of 1.5 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
Limit violation
Discharged 0 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
Limit violation
Discharged 0 MPN/100mL against a permitted limit of 284 MPN/100mL (WK GEOMN)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
7% over limit
Discharged 9.45 kg/d against a permitted limit of 8.86 kg/d (WKLY MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
111% over limit
Discharged 9.5 mg/L against a permitted limit of 4.5 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
72% over limit
Discharged 7.76 mg/L against a permitted limit of 4.5 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
December 31, 2024
Mercury, total low level
117% over limit
Discharged 0.00000499 mg/L against a permitted limit of 0.0000023 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Mercury, total low level
53% over limit
Discharged 0.00000353 mg/L against a permitted limit of 0.0000023 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
98% over limit
Discharged 5.84 kg/d against a permitted limit of 2.95 kg/d (WKLY MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
600% over limit
Discharged 10.5 mg/L against a permitted limit of 1.5 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
239% over limit
Discharged 3.39 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (5 hours ago)