DEFIANCE WWTP
NPDES ID: OH0024899
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: 1 effluent violation, 1 single-event violation.
Violations
April 30, 2026
Mercury, total low level
95% over limit
Discharged 0.00000351 mg/L against a permitted limit of 0.0000018 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
pH, minimum
0% over limit
Discharged 6.2 SU against a permitted limit of 6.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
November 30, 2025
Mercury, total low level
37% over limit
Discharged 0.00000247 mg/L against a permitted limit of 0.0000018 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH, minimum
0% over limit
Discharged 5.9 SU against a permitted limit of 6.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
October 31, 2025
Mercury, total low level
63% over limit
Discharged 0.00000293 mg/L against a permitted limit of 0.0000018 mg/L (MO AVG)
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
July 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
June 30, 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
November 30, 2024
Overflows
0% over limit
Discharged 0.0329 occur/d against a permitted limit of 0 occur/d (MO AVG)
DMR, Monitor Only - Overdue
Overflows
0% over limit
Discharged 0.0329 occur/d against a permitted limit of 0 occur/d (DAILY MX)
DMR, Monitor Only - Overdue
Overflow volume [SS0 volume, CSO volume]
0% over limit
Discharged 1.6e-7 gal against a permitted limit of 0 gal (DAILY MX)
DMR, Monitor Only - Overdue
Overflow volume [SS0 volume, CSO volume]
0% over limit
Discharged 1.6e-7 gal against a permitted limit of 0 gal (MO AVG)
DMR, Monitor Only - Overdue
October 31, 2024
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
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)