Ashley STP
Ashley, OH · Delaware County · Publicly Owned Treatment Works
- Average flow
- 0.09 MGD
- Design flow
- 0.19 MGD
- NPDES permit
- OH0054488
- Effective
- Permit expires
- March 2029
- Population served
- 1,198
- CWNS 2022
Ashley STP is a publicly owned wastewater treatment works in Ashley, Delaware County, Ohio treating an average of 0.09 million gallons per day against a permitted design capacity of 0.19 MGD, serving about 1,198 residents. Treatment on site includes biogas silos. It discharges under NPDES permit OH0054488 (effective), which expires in March 2029, with 17 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Biogas silos
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Compliance snapshot (last 3 years)
- Total violations
- 17
- Effluent violations
- 17
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Ashley STP.
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Nearby wastewater treatment plants in Ohio
Cardington · 8 mi away
0.16 MGD
Marengo · 8 mi away
0.01 MGD
Delaware · 9 mi away
3.68 MGD
Marion · 10 mi away
0.0031 MGD
Edison · 11 mi away
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Marion · 12 mi away
0.02 MGD
Mount Gilead · 12 mi away
0.34 MGD
Caledonia · 12 mi away
0.0017 MGD
Ashley STP: 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 February 28, 2025.