WILLIAMSPORT WWTP
NPDES ID: OH0022519
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: 2 effluent violations.
Violations
June 30, 2026
Chlorine, total residual
2268% over limit
Discharged 0.9 mg/L against a permitted limit of 0.038 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2026
Chlorine, total residual
3321% over limit
Discharged 1.3 mg/L against a permitted limit of 0.038 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
pH
0% over limit
Discharged 9.4 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Mercury, total low level
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 6.23 SU against a permitted limit of 6.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
Solids, total suspended
4194% over limit
Discharged 730 kg/d against a permitted limit of 17 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Mercury, total low level
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
12841% over limit
Discharged 3300 kg/d against a permitted limit of 25.5 kg/d (WKLY MAX)
DMR, Limited - Numeric Violation
October 31, 2025
E. coli, MTEC-MF
3351% over limit
Discharged 9800 MPN/100mL against a permitted limit of 284 MPN/100mL (WK GEOMN)
DMR, Limited - Numeric Violation
Chlorine, total residual
374% over limit
Discharged 0.18 mg/L against a permitted limit of 0.038 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
Chlorine, total residual
321% over limit
Discharged 0.16 mg/L against a permitted limit of 0.038 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.19 SU against a permitted limit of 6.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
August 31, 2025
Chlorine, total residual
953% over limit
Discharged 0.4 mg/L against a permitted limit of 0.038 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
211% over limit
Discharged 882 MPN/100mL against a permitted limit of 284 MPN/100mL (WK GEOMN)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
17% over limit
Discharged 147 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
July 31, 2025
E. coli, MTEC-MF
3844% over limit
Discharged 11200 MPN/100mL against a permitted limit of 284 MPN/100mL (WK GEOMN)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
521% over limit
Discharged 782 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Chlorine, total residual
242% over limit
Discharged 0.13 mg/L against a permitted limit of 0.038 mg/L (DAILY MX)
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
May 31, 2025
Solids, total suspended
143% over limit
Discharged 62 kg/d against a permitted limit of 25.5 kg/d (WKLY MAX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (4 hours ago)