WEST LIBERTY STP
NPDES ID: OH0022098
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.
Violations
February 28, 2026
Nitrogen, ammonia total [as N]
44% over limit
Discharged 2.3 mg/L against a permitted limit of 1.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
171% over limit
Discharged 6.5 mg/L against a permitted limit of 2.4 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
71% over limit
Discharged 4.1 mg/L against a permitted limit of 2.4 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
75% over limit
Discharged 4.2 mg/L against a permitted limit of 2.4 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
31% over limit
Discharged 2.1 mg/L against a permitted limit of 1.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
29% over limit
Discharged 2.9 mg/L against a permitted limit of 2.25 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
May 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
August 31, 2024
E. coli, MTEC-MF
4% over limit
Discharged 294 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 (4 days ago)