Coralville WWTP
Coralville, IA · Johnson County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 22.56 MGD
- NPDES permit
- IA0020788
- Effective
- Permit expires
- March 2026
- Population served
- 20,178
- CWNS 2022
Coralville WWTP is a publicly owned wastewater treatment works in Coralville, Johnson County, Iowa, serving about 20,178 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit IA0020788 (effective), which expires in March 2026, with 1 recorded violation in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
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
Decision-makers at Coralville WWTP.
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Nearby wastewater treatment plants in Iowa
North Liberty · 3 mi away
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Tiffin · 4 mi away
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Iowa City · 7 mi away
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Hills · 10 mi away
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Swisher · 12 mi away
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Ely · 13 mi away
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West Branch · 14 mi away
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Kalona · 15 mi away
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Coralville WWTP: 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 September 11, 2026.