Niles WWTP
Niles, OH · Trumbull County · Publicly Owned Treatment Works
- Average flow
- 3.43 MGD
- Design flow
- 6.2 MGD
- NPDES permit
- OH0026743
- Effective
- Permit expires
- September 2028
- Population served
- 22,194
- CWNS 2022
Niles WWTP is a publicly owned wastewater treatment works in Niles, Trumbull County, Ohio treating an average of 3.43 million gallons per day against a permitted design capacity of 6.2 MGD, serving about 22,194 residents. Treatment on site includes clarifiers, uncovered lagoons, carrousels / oxidation ditches. It discharges under NPDES permit OH0026743 (effective), which expires in September 2028, with 9 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Uncovered lagoons
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Carrousels / oxidation ditches
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Compliance snapshot (last 3 years)
- Total violations
- 9
- Effluent violations
- 9
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Niles WWTP.
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Nearby wastewater treatment plants in Ohio
Mineral Ridge · 2 mi away
2.64 MGD
Girard · 3 mi away
1.97 MGD
Warren · 4 mi away
10.13 MGD
Warren · 6 mi away
2.69 MGD
Warren · 6 mi away
0.0034 MGD
Vienna · 6 mi away
0.0052 MGD
Youngstown · 8 mi away
20.84 MGD
Hubbard · 9 mi away
0.00057 MGD
Niles 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 22, 2025.