Coldwater WWTP
Coldwater, OH · Mercer County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.9 MGD
- NPDES permit
- OH0024694
- Effective
- Permit expires
- January 2030
- Population served
- 4,774
- CWNS 2022
Coldwater WWTP is a publicly owned wastewater treatment works in Coldwater, Mercer County, Ohio, serving about 4,774 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit OH0024694 (effective), which expires in January 2030, with 55 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 55
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Coldwater WWTP.
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Nearby wastewater treatment plants in Ohio
Celina · 3 mi away
—
Celina · 3 mi away
0.04 MGD
Celina · 4 mi away
1.17 MGD
Celina · 4 mi away
—
St Henry · 4 mi away
0.09 MGD
Chickasaw · 9 mi away
—
Ft Recovery · 9 mi away
0.09 MGD
St. Marys · 12 mi away
0.0018 MGD
Coldwater WWTP: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated April 24, 2025.