Fairfield WWTP
Fairfield, OH · Butler County · Publicly Owned Treatment Works
- Average flow
- 3.88 MGD
- Design flow
- 10 MGD
- NPDES permit
- OH0025071
- Effective
- Permit expires
- November 2026
- Population served
- 44,396
- CWNS 2022
Fairfield WWTP is a publicly owned wastewater treatment works in Fairfield, Butler County, Ohio treating an average of 3.88 million gallons per day against a permitted design capacity of 10 MGD, serving about 44,396 residents. Treatment on site includes clarifiers. It discharges under NPDES permit OH0025071 (effective), which expires in November 2026, with 3 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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Compliance snapshot (last 3 years)
- Total violations
- 3
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Fairfield
Fairfield's capital improvement plan lists 2 water, sewer and wastewater line items worth $10M starting 2023–2025. The largest budgeted items are shown here.
| Project | Budget | Years |
|---|---|---|
| Improve Wastewater Treatment Plant Aeration System | $7,100,000 | 2023–2027 |
| Wastewater Treatment Plant Solar Array | $2,500,000 | 2025–2026 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
Decision-makers at Fairfield WWTP.
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Nearby wastewater treatment plants in Ohio
Hamilton · 1 mi away
5.26 MGD
Hamilton · 4 mi away
0.18 MGD
New Miami · 5 mi away
0.16 MGD
Ross · 5 mi away
0.14 MGD
Cincinnati · 6 mi away
0.02 MGD
Hamilton · 6 mi away
0.0014 MGD
Hamilton · 6 mi away
0.0087 MGD
Cincinnati · 7 mi away
0.000007 MGD
Fairfield 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 September 4, 2025.