Wilmington WWTP
475 S Nelson Ave, Wilmington, OH 45177 · Clinton County · Publicly Owned Treatment Works
- Average flow
- 3.16 MGD
- Design flow
- 3 MGD
- NPDES permit
- OH0028134
- Administratively continued
- 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 3.16 million gallons per day against a permitted design capacity of 3 MGD, serving about 12,518 residents. It discharges under NPDES permit OH0028134 (administratively continued), which expires in September 2026, with 6 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in January 1997.
Treatment technology
One treatment structure or unit process identified at Wilmington WWTP.
Available with a free Klarifi account
See the full treatment train at Wilmington WWTP: structures, unit processes and planned upgrades, with exact unit counts.
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.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Wilmington WWTP in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- EPA inspections
- 0
- none on record
Latest case · Jan 1997
WILMINGTON, CITY OF
Administrative order · CWA, Sewage Sludge Disposal · Final Order No Penalty
Source: EPA ECHO, civil enforcement case 05-1996-0598.
Full case history with a free Klarifi account
Every action against Wilmington WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
2 verified contacts for Wilmington WWTP, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Wilmington WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Ohio
Wilmington · 5 mi away
0.0019 MGD
Clarksville · 7 mi away
0.07 MGD
New Vienna · 10 mi away
0.0006 MGD
Lees Creek · 11 mi away
0.0042 MGD
New Vienna · 12 mi away
0.1 MGD
Sabina · 12 mi away
—
Blanchester · 13 mi away
0.75 MGD
Waynesville · 14 mi away
0.62 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 October 26, 2026; facility record last updated September 13, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · WWTP · Biosolids · all terms