Caledonia WWTP
Caledonia, OH · Marion County · Publicly Owned Treatment Works
- Average flow
- 0.03 MGD
- Design flow
- 0.08 MGD
- NPDES permit
- OH0021750
- Effective
- Permit expires
- April 2028
- Population served
- 591
- CWNS 2022
Caledonia WWTP is a publicly owned wastewater treatment works in Caledonia, Marion County, Ohio treating an average of 0.03 million gallons per day against a permitted design capacity of 0.08 MGD, serving about 591 residents. It discharges under NPDES permit OH0021750 (effective), which expires in April 2028, with 27 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 27
- Effluent violations
- 21
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Caledonia WWTP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Ohio
Caledonia · 5 mi away
0.0017 MGD
Marion · 6 mi away
0.03 MGD
Marion · 8 mi away
0.53 MGD
Edison · 8 mi away
—
Bucyrus · 9 mi away
0.00061 MGD
Mount Gilead · 9 mi away
0.34 MGD
Cardington · 9 mi away
0.16 MGD
Marion · 10 mi away
0.02 MGD
Caledonia 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 6, 2025.