Corwith City Of STP
Corwith, IA · Hancock County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.5 MGD
- NPDES permit
- IA0021351
- Effective
- Permit expires
- June 2028
- Population served
- 266
- CWNS 2022
Corwith City Of STP is a publicly owned wastewater treatment works in Corwith, Hancock County, Iowa, serving about 266 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit IA0021351 (effective), which expires in June 2028, with 42 recorded violations 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
- 42
- Effluent violations
- 42
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Corwith City Of STP.
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Nearby wastewater treatment plants in Iowa
Wesley · 8 mi away
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Lu Verne · 8 mi away
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Kanawha · 8 mi away
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Renwick · 12 mi away
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Livermore · 14 mi away
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Algona · 16 mi away
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Goodell · 17 mi away
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Woden · 18 mi away
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Corwith City Of 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 April 23, 2025.