Williamsville East Stp, Village Of
Williamsville, IL · Sangamon County · Publicly Owned Treatment Works
- Average flow
- 0.12 MGD
- Design flow
- 1.78 MGD
- NPDES permit
- ILG582011
- Effective
- Permit expires
- May 2027
- Population served
- 1,433
- CWNS 2022
Williamsville East Stp, Village Of is a publicly owned wastewater treatment works in Williamsville, Sangamon County, Illinois treating an average of 0.12 million gallons per day against a permitted design capacity of 1.78 MGD, serving about 1,433 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit ILG582011 (effective), which expires in May 2027, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Williamsville East Stp, Village Of.
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Nearby wastewater treatment plants in Illinois
Riverton · 6 mi away
0.15 MGD
Springfield · 9 mi away
7.59 MGD
Buffalo · 9 mi away
—
Athens · 11 mi away
0.11 MGD
Springfield · 11 mi away
3.95 MGD
Mount Pulaski · 14 mi away
0.09 MGD
Petersburg · 17 mi away
0.14 MGD
Illiopolis · 18 mi away
0.07 MGD
Williamsville East Stp, Village Of: 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 6, 2025.