Caldwell WWTP
Caldwell, OH · Noble County · Publicly Owned Treatment Works
- Average flow
- 0.45 MGD
- Design flow
- 0.8 MGD
- NPDES permit
- OH0020559
- Effective
- Permit expires
- February 2029
- Population served
- 2,618
- CWNS 2022
Caldwell WWTP is a publicly owned wastewater treatment works in Caldwell, Noble County, Ohio treating an average of 0.45 million gallons per day against a permitted design capacity of 0.8 MGD, serving about 2,618 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit OH0020559 (effective), which expires in February 2029, with 13 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
- 13
- Effluent violations
- 13
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Caldwell WWTP.
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Nearby wastewater treatment plants in Ohio
Pleasant City · 12 mi away
0.09 MGD
Senecaville · 13 mi away
0.05 MGD
Byesville · 14 mi away
0.03 MGD
Beverly · 15 mi away
0.12 MGD
Lowell · 15 mi away
0.03 MGD
Mcconnelsville · 18 mi away
0.00066 MGD
Cambridge · 18 mi away
0.0022 MGD
Mcconnelsville · 19 mi away
0.19 MGD
Caldwell 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 September 30, 2025.