Onarga Stp, Village Of
Onarga, IL · Iroquois County · Publicly Owned Treatment Works
- Average flow
- 0.05 MGD
- Design flow
- 0.88 MGD
- NPDES permit
- IL0076813
- Effective
- Permit expires
- September 2028
- Population served
- 1,409
- CWNS 2022
Onarga Stp, Village Of is a publicly owned wastewater treatment works in Onarga, Iroquois County, Illinois treating an average of 0.05 million gallons per day against a permitted design capacity of 0.88 MGD, serving about 1,409 residents. It discharges under NPDES permit IL0076813 (effective), which expires in September 2028, with 14 recorded violations in the last three years. Planned upgrades on record: disinfection, chemical.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Disinfection, Chemical
planned upgradeUnlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 14
- Effluent violations
- 14
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Onarga Stp, Village Of.
No verified contacts on file yet
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Cissna Park · 14 mi away
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Watseka · 14 mi away
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Chatsworth · 15 mi away
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Clifton · 15 mi away
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Milford · 19 mi away
—
Forrest · 22 mi away
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Paxton · 22 mi away
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Onarga Stp, Village 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 May 18, 2025.