Woodstock Northside Wastewater Treatment Plant
Woodstock, IL · Mchenry County · Publicly Owned Treatment Works
- Average flow
- 1.77 MGD
- Design flow
- —
- NPDES permit
- ILL031861
- Effective
- Permit expires
- December 2030
- Population served
- 15,634
- CWNS 2022
Woodstock Northside Wastewater Treatment Plant is a publicly owned wastewater treatment works in Woodstock, Mchenry County, Illinois treating an average of 1.77 million gallons per day, serving about 15,634 residents. Treatment on site includes clarifiers, uncovered lagoons. It discharges under NPDES permit ILL031861 (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.
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
21 verified contacts for Woodstock Northside Wastewater Treatment Plant, with validated emails and direct phone numbers.
Unlock 21 verified contacts (18 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Woodstock Northside Wastewater Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Woodstock · 3 mi away
1.07 MGD
Wonder Lake · 6 mi away
0.11 MGD
Lakewood · 8 mi away
0.29 MGD
Marengo · 10 mi away
0.24 MGD
Johnsburg · 10 mi away
0.03 MGD
Crystal Lake · 10 mi away
0.43 MGD
Hebron · 10 mi away
0.08 MGD
Harvard · 10 mi away
0.81 MGD
Woodstock Northside Wastewater Treatment Plant: 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 29, 2025.