Wilmington WWTP
Wilmington, OH · Clinton County · Publicly Owned Treatment Works
- Average flow
- 1.94 MGD
- Design flow
- 3 MGD
- NPDES permit
- OH0028134
- Effective
- Permit expires
- September 2026
- Population served
- 12,518
- CWNS 2022
Wilmington WWTP is a publicly owned wastewater treatment works in Wilmington, Clinton County, Ohio treating an average of 1.94 million gallons per day against a permitted design capacity of 3 MGD, serving about 12,518 residents. Treatment on site includes clarifiers, uncovered lagoons. It discharges under NPDES permit OH0028134 (effective), which expires in September 2026, with 6 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
- 6
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Wilmington WWTP.
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Nearby wastewater treatment plants in Ohio
Wilmington · 5 mi away
0.0016 MGD
Clarksville · 7 mi away
0.05 MGD
New Vienna · 10 mi away
0.00051 MGD
Lees Creek · 11 mi away
0.0042 MGD
New Vienna · 12 mi away
0.0063 MGD
Sabina · 12 mi away
0.18 MGD
Blanchester · 13 mi away
0.34 MGD
Waynesville · 14 mi away
0.44 MGD
Wilmington 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 May 23, 2025.