Little Jelloway Creek WWTP
Mount Vernon, OH · Knox County · Publicly Owned Treatment Works
- Average flow
- 0.54 MGD
- Design flow
- 0.9 MGD
- NPDES permit
- OH0037117
- Effective
- Permit expires
- January 2030
- Population served
- 1,686
- CWNS 2022
Little Jelloway Creek WWTP is a publicly owned wastewater treatment works in Mount Vernon, Knox County, Ohio treating an average of 0.54 million gallons per day against a permitted design capacity of 0.9 MGD, serving about 1,686 residents. Treatment on site includes aerated lagoons. It discharges under NPDES permit OH0037117 (effective), which expires in January 2030, with 4 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
- 4
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Little Jelloway Creek WWTP.
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Nearby wastewater treatment plants in Ohio
Danville · 4 mi away
0.08 MGD
Gambier · 4 mi away
0.14 MGD
Mount Vernon · 5 mi away
0.01 MGD
Mount Vernon · 8 mi away
1.92 MGD
Fredericktown · 12 mi away
0.14 MGD
Perrysville · 13 mi away
0.0022 MGD
Butler · 13 mi away
0.25 MGD
Millersburg · 14 mi away
0.0045 MGD
Little Jelloway Creek 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 April 5, 2025.