Collinsville Wastewater Treatment Plant
Collinsville, IL · Madison County · Publicly Owned Treatment Works
- Average flow
- 2.59 MGD
- Design flow
- —
- NPDES permit
- ILL028215
- Effective
- Permit expires
- December 2030
- Population served
- 33,769
- CWNS 2022
Collinsville Wastewater Treatment Plant is a publicly owned wastewater treatment works in Collinsville, Madison County, Illinois treating an average of 2.59 million gallons per day, serving about 33,769 residents. Treatment on site includes clarifiers, uncovered lagoons, biogas balloons. It discharges under NPDES permit ILL028215 (effective), which expires in December 2030, with 5 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
- 5
- Effluent violations
- 5
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Collinsville
Collinsville's capital improvement plan lists 31 water, sewer and wastewater line items worth $4M starting 2025–2025. The largest budgeted items are shown here.
All water and sewer capital projects in Collinsville →
| Project | Budget | Years |
|---|---|---|
| Solar Project: Water Treatment Plant | $1,700,000 | 2025–2025 |
| Sugar Loaf Unsewered Areas | $472,500 | 2025–2025 |
| Water Main Replacement at I-255 | $225,000 | 2025–2025 |
| Hickory Pt. Lift Station Upgrade | $175,000 | 2025–2025 |
| Summit Lift Station Upgrade | $175,000 | 2025–2025 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
32 verified contacts for Collinsville Wastewater Treatment Plant, with validated emails and direct phone numbers.
Unlock 32 verified contacts (29 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Collinsville Wastewater Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
O Fallon · 6 mi away
0.38 MGD
O Fallon · 6 mi away
1.75 MGD
Belleville · 9 mi away
0.51 MGD
Edwardsville · 9 mi away
2.3 MGD
Roxana · 10 mi away
0.21 MGD
Swansea · 10 mi away
1 MGD
O Fallon · 12 mi away
1.98 MGD
Belleville · 12 mi away
0.71 MGD
Collinsville 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 28, 2025.