Effingham STP
Effingham, IL · Effingham County · Publicly Owned Treatment Works
- Average flow
- 1.34 MGD
- Design flow
- —
- NPDES permit
- ILL028622
- Effective
- Permit expires
- December 2030
- Population served
- 12,601
- CWNS 2022
Effingham STP is a publicly owned wastewater treatment works in Effingham, Effingham County, Illinois treating an average of 1.34 million gallons per day, serving about 12,601 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches, biogas silos, biological treatment, other, biosolids aerobic digestion and other unit processes. It discharges under NPDES permit ILL028622 (effective), which expires in December 2030, with 49 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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Carrousels / oxidation ditches
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Biogas silos
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Biological Treatment, Other
unit processBiosolids Aerobic Digestion
unit processDisinfection, UV
unit processPrimary Clarification or Sedimentation
unit processScreening
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Compliance snapshot (last 3 years)
- Total violations
- 49
- Effluent violations
- 19
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Effingham STP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Effingham STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Teutopolis · 4 mi away
—
Watson · 6 mi away
0.01 MGD
Shumway · 8 mi away
0.001 MGD
Sigel · 8 mi away
0.38 MGD
Montrose · 10 mi away
0.02 MGD
Dieterich · 10 mi away
0.12 MGD
Mason · 11 mi away
—
Stewardson · 11 mi away
0.12 MGD
Effingham STP: 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 February 15, 2025.