Maroa Stp, City Of
Maroa, IL · Macon County · Publicly Owned Treatment Works
- Average flow
- 0.06 MGD
- Design flow
- 0.9 MGD
- NPDES permit
- IL0025208
- Effective
- Permit expires
- April 2028
- Population served
- 1,524
- CWNS 2022
Maroa Stp, City Of is a publicly owned wastewater treatment works in Maroa, Macon County, Illinois treating an average of 0.06 million gallons per day against a permitted design capacity of 0.9 MGD, serving about 1,524 residents. It discharges under NPDES permit IL0025208 (effective), which expires in April 2028, with 95 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 95
- Effluent violations
- 18
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Maroa Stp, City Of.
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Nearby wastewater treatment plants in Illinois
Warrensburg · 10 mi away
0.03 MGD
Decatur · 14 mi away
26.53 MGD
Cerro Gordo · 15 mi away
0.6 MGD
Harristown · 16 mi away
0.04 MGD
Niantic · 16 mi away
0.03 MGD
Mount Pulaski · 18 mi away
0.09 MGD
Macon · 18 mi away
—
Illiopolis · 20 mi away
0.07 MGD
Maroa Stp, 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 September 11, 2026; facility record last updated March 1, 2025.