Diehl Lake Collection & WWTP
Ellsworth, OH · Mahoning County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.03 MGD
- NPDES permit
- OH0129666
- Effective
- Permit expires
- October 2026
- Population served
- 200
- CWNS 2022
Diehl Lake Collection & WWTP is a publicly owned wastewater treatment works in Ellsworth, Mahoning County, Ohio, serving about 200 residents. Treatment on site includes aerated lagoons. It discharges under NPDES permit OH0129666 (effective), which expires in October 2026, with 5 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Aerated lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 5
- Effluent violations
- 5
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Diehl Lake Collection & WWTP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Diehl Lake Collection & WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Ohio
Salem · 7 mi away
1.71 MGD
Salem · 8 mi away
0.0011 MGD
Youngstown · 9 mi away
2.53 MGD
Damascus · 9 mi away
0.04 MGD
Washingtonville · 10 mi away
0.05 MGD
Craig Beach · 10 mi away
0.18 MGD
Deerfield · 10 mi away
0.000085 MGD
Beloit · 10 mi away
0.03 MGD
Diehl Lake Collection & 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 November 15, 2025.