Crystal Lake WWTP #3
Crystal Lake, IL · Mchenry County · Publicly Owned Treatment Works
- Average flow
- 0.43 MGD
- Design flow
- —
- NPDES permit
- ILL053457
- Effective
- Permit expires
- December 2030
- Population served
- 8,721
- CWNS 2022
Crystal Lake WWTP #3 is a publicly owned wastewater treatment works in Crystal Lake, Mchenry County, Illinois treating an average of 0.43 million gallons per day, serving about 8,721 residents. Treatment on site includes biogas balloons. It discharges under NPDES permit ILL053457 (effective), which expires in December 2030, with 3 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Biogas balloons
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Compliance snapshot (last 3 years)
- Total violations
- 3
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
20 verified contacts for Crystal Lake WWTP #3, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Crystal Lake WWTP #3, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Lake In The Hills · 4 mi away
2.19 MGD
Cary · 5 mi away
1.38 MGD
Lakewood · 5 mi away
0.29 MGD
Algonquin · 7 mi away
2.3 MGD
Woodstock · 7 mi away
1.07 MGD
Huntley · 8 mi away
0.82 MGD
Johnsburg · 9 mi away
0.03 MGD
Huntley · 9 mi away
0.69 MGD
Crystal Lake WWTP #3: 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 2, 2025.