Cromwell, City-STP -Sirwa
Creston, IA · Union County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- IA0074063
- Administratively continued
- Permit expires
- June 2016
- Population served
- 105
- CWNS 2022
Cromwell, City-STP -Sirwa is a publicly owned wastewater treatment works in Creston, Union County, Iowa, serving about 105 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit IA0074063 (administratively continued), which expires in June 2016, with 4 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
- 4
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Cromwell, City-STP -Sirwa.
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Cromwell, City-STP -Sirwa: 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 11, 2025.