Lower Little Miami WWTP
Maineville, OH · Warren County · Publicly Owned Treatment Works
- Average flow
- 5.43 MGD
- Design flow
- 12 MGD
- NPDES permit
- OH0071692
- Expired
- Permit expires
- February 2026
- Population served
- 48,074
- CWNS 2022
Lower Little Miami WWTP is a publicly owned wastewater treatment works in Maineville, Warren County, Ohio treating an average of 5.43 million gallons per day against a permitted design capacity of 12 MGD, serving about 48,074 residents. Treatment on site includes clarifiers. It discharges under NPDES permit OH0071692 (expired), which expires in February 2026, 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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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
1 verified contact for Lower Little Miami WWTP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Lower Little Miami WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Ohio
Lebanon · 4 mi away
2.46 MGD
Mason · 4 mi away
5.56 MGD
Loveland · 5 mi away
1.5 MGD
Loveland · 5 mi away
0.23 MGD
Loveland · 5 mi away
3.35 MGD
Loveland · 6 mi away
0.09 MGD
Goshen · 6 mi away
0.0051 MGD
Pleasant Plain · 7 mi away
0.01 MGD
Lower Little Miami 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 23, 2025.