Algonquin Stw, Village Of
Algonquin, IL · Mchenry County · Publicly Owned Treatment Works
- Average flow
- 2.3 MGD
- Design flow
- —
- NPDES permit
- ILL023329
- Effective
- Permit expires
- December 2030
- Population served
- 30,730
- CWNS 2022
Algonquin Stw, Village Of is a publicly owned wastewater treatment plant in Algonquin, Mchenry County, Illinois treating an average of 2.3 million gallons per day, serving about 30,730 residents. Treatment on site includes clarifiers, biogas silos. It discharges under NPDES permit ILL023329 (effective), which expires in December 2030, with 13 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
- 13
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
26 verified contacts for Algonquin Stw, Village Of, with validated emails and direct phone numbers.
Unlock 26 verified contacts (23 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Algonquin Stw, Village Of, plus the full compliance history and discharge data.
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Cary · 4 mi away
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East Dundee · 5 mi away
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Huntley · 6 mi away
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Crystal Lake · 7 mi away
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Lakewood · 8 mi away
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Huntley · 8 mi away
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Pingree Grove · 9 mi away
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Algonquin Stw, 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 May 18, 2025.