Centralia Stw Main, City Of
28625 West 17th Street Road, Centralia, IL 62801 · Clinton County · Publicly Owned Treatment Works
- Average flow
- 2.09 MGD
- Design flow
- 4.5 MGD
- NPDES permit
- IL0027979
- Effective
- Permit expires
- July 2031
- Population served
- 12,142
- CWNS 2022
Centralia Stw Main, City Of is a publicly owned wastewater treatment plant in Centralia, Clinton County, Illinois treating an average of 2.09 million gallons per day against a permitted design capacity of 4.5 MGD, serving about 12,142 residents. It discharges under NPDES permit IL0027979 (effective), which expires in July 2031, with 1 recorded violation in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Centralia Stw Main, City Of.
Available with a free Klarifi account
See the full treatment train at Centralia Stw Main, City Of: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Centralia Stw Main, City Of, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Centralia Stw Main, City Of, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Wamac · 1 mi away
0.14 MGD
Irvington · 5 mi away
0.05 MGD
Junction City · 5 mi away
0.04 MGD
Hoffman · 5 mi away
0.06 MGD
Sandoval · 7 mi away
0.26 MGD
Hoyleton · 8 mi away
0.04 MGD
Richview · 9 mi away
0.02 MGD
Odin · 9 mi away
0.08 MGD
Centralia Stw Main, City 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 October 26, 2026; facility record last updated September 13, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Oxidation ditch · Anaerobic digester · all terms