Ashley STP
5981 Steamtown Rd, Ashley, OH 43003 · Delaware County · Publicly Owned Treatment Works
- Average flow
- 0.14 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 0.14 million gallons per day against a permitted design capacity of 0.19 MGD, serving about 1,198 residents. It discharges under NPDES permit OH0054488 (effective), which expires in March 2029, with 19 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in June 2024.
Treatment technology
One treatment structure or unit process identified at Ashley STP.
Available with a free Klarifi account
See the full treatment train at Ashley STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 19
- Effluent violations
- 19
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 Ashley STP in EPA's ICIS system.
- Formal actions
- 1
- 1 since FY2020
- Compliance actions
- $4.6M
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Jun 2024
AshleyWWTP_AOC
Administrative order · CWA, NPDES Permit Violations · Final Order Issued · Compliance actions $4.6M
Source: EPA ECHO, civil enforcement case 05-2024-0324.
Full case history with a free Klarifi account
Every action against Ashley STP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Ashley STP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Ohio
Cardington · 8 mi away
0.41 MGD
Marengo · 8 mi away
0.04 MGD
Delaware · 9 mi away
5.21 MGD
Marion · 10 mi away
0.0042 MGD
Edison · 11 mi away
—
Marion · 12 mi away
0.04 MGD
Mount Gilead · 12 mi away
0.57 MGD
Caledonia · 12 mi away
0.003 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 October 26, 2026; facility record last updated February 28, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Filter press · FOG · all terms