Alton Waste Water Treatment Plant
Alton, IL · Madison County · Publicly Owned Treatment Works
- Average flow
- 5.38 MGD
- Design flow
- —
- NPDES permit
- ILL027464
- Effective
- Permit expires
- December 2030
- Population served
- —
- CWNS 2022
Alton Waste Water Treatment Plant is a publicly owned wastewater treatment works in Alton, Madison County, Illinois treating an average of 5.38 million gallons per day. Treatment on site includes clarifiers. It discharges under NPDES permit ILL027464 (effective), which expires in December 2030, with 39 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Compliance snapshot (last 3 years)
- Total violations
- 39
- Effluent violations
- 18
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Alton Waste Water Treatment Plant, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Alton Waste Water Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
East Alton · 1 mi away
0.51 MGD
Roxana · 6 mi away
0.21 MGD
Godfrey · 7 mi away
0.6 MGD
Edwardsville · 7 mi away
2.3 MGD
Edwardsville · 10 mi away
0.18 MGD
Brighton · 11 mi away
0.26 MGD
Bunker Hill · 14 mi away
0.09 MGD
Hamel · 15 mi away
0.08 MGD
Alton Waste Water 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 2, 2025.