Oneida Sanitary District - North STP
Oneida, IL · Knox County · Publicly Owned Treatment Works
- Average flow
- 0.05 MGD
- Design flow
- 0.23 MGD
- NPDES permit
- ILG580143
- Effective
- Permit expires
- May 2027
- Population served
- 463
- CWNS 2022
Oneida Sanitary District - North STP is a publicly owned wastewater treatment works in Oneida, Knox County, Illinois treating an average of 0.05 million gallons per day against a permitted design capacity of 0.23 MGD, serving about 463 residents. Treatment on site includes aerated lagoons. It discharges under NPDES permit ILG580143 (effective), which expires in May 2027, 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
Decision-makers at Oneida Sanitary District - North STP.
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Nearby wastewater treatment plants in Illinois
Oneida · 1 mi away
0.05 MGD
Altona · 4 mi away
0.01 MGD
Wataga · 4 mi away
0.05 MGD
Wataga · 5 mi away
0.005 MGD
Woodhull · 8 mi away
0.09 MGD
Victoria · 8 mi away
0.15 MGD
Galva · 10 mi away
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Dahinda · 11 mi away
0.03 MGD
Oneida Sanitary District - North STP: 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 28, 2025.