Mason Stp, Town Of
Mason, IL · Effingham County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.13 MGD
- NPDES permit
- ILG580276
- Effective
- Permit expires
- May 2027
- Population served
- 450
- CWNS 2022
Mason Stp, Town Of is a publicly owned wastewater treatment works in Mason, Effingham County, Illinois, serving about 450 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit ILG580276 (effective), which expires in May 2027, with 8 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 8
- Effluent violations
- 8
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Mason Stp, Town Of.
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Nearby wastewater treatment plants in Illinois
Edgewood · 3 mi away
0.01 MGD
Watson · 5 mi away
0.01 MGD
Iola · 8 mi away
0.08 MGD
Altamont · 10 mi away
—
Effingham · 11 mi away
1.34 MGD
Farina · 13 mi away
—
St Peter · 14 mi away
0.007 MGD
Louisville · 15 mi away
0.008 MGD
Mason Stp, Town 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 September 11, 2026; facility record last updated August 19, 2026.