Wonder Lake Water Reclamation Facility
Wonder Lake, IL · Mchenry County · Publicly Owned Treatment Works
- Average flow
- 0.11 MGD
- Design flow
- —
- NPDES permit
- ILL077836
- Effective
- Permit expires
- December 2030
- Population served
- 3,963
- CWNS 2022
Wonder Lake Water Reclamation Facility is a publicly owned wastewater treatment works in Wonder Lake, Mchenry County, Illinois treating an average of 0.11 million gallons per day, serving about 3,963 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit ILL077836 (effective), which expires in December 2030, with 144 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
- 144
- Effluent violations
- 70
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Wonder Lake Water Reclamation Facility.
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Nearby wastewater treatment plants in Illinois
Johnsburg · 5 mi away
0.03 MGD
Woodstock · 6 mi away
1.77 MGD
Spring Grove · 6 mi away
0.03 MGD
Hebron · 7 mi away
0.08 MGD
Woodstock · 8 mi away
1.07 MGD
Crystal Lake · 11 mi away
0.43 MGD
Lakewood · 12 mi away
0.29 MGD
Harvard · 14 mi away
0.81 MGD
Wonder Lake Water Reclamation Facility: 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 March 16, 2025.