Cary Wwtp, Village Of
Cary, IL · Mchenry County · Publicly Owned Treatment Works
- Average flow
- 1.38 MGD
- Design flow
- —
- NPDES permit
- ILL020516
- Effective
- Permit expires
- December 2030
- Population served
- 17,929
- CWNS 2022
Cary Wwtp, Village Of is a publicly owned wastewater treatment works in Cary, Mchenry County, Illinois treating an average of 1.38 million gallons per day, serving about 17,929 residents. Treatment on site includes carrousels / oxidation ditches, biogas silos, biogas balloons. It discharges under NPDES permit ILL020516 (effective), which expires in December 2030, with 1 recorded violation in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Carrousels / oxidation ditches
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Biogas silos
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Biogas balloons
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Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
16 verified contacts for Cary Wwtp, Village Of, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Cary Wwtp, Village Of, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Lake In The Hills · 4 mi away
2.19 MGD
Algonquin · 4 mi away
2.3 MGD
Crystal Lake · 5 mi away
0.43 MGD
East Dundee · 8 mi away
0.81 MGD
Lakewood · 8 mi away
0.29 MGD
Huntley · 9 mi away
0.82 MGD
Huntley · 11 mi away
0.69 MGD
Woodstock · 12 mi away
1.07 MGD
Cary Wwtp, 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 March 28, 2025.