Winthrop City Of STP
Winthrop, IA · Buchanan County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 1.15 MGD
- NPDES permit
- IA0032808
- Effective
- Permit expires
- January 2031
- Population served
- 888
- CWNS 2022
Winthrop City Of STP is a publicly owned wastewater treatment works in Winthrop, Buchanan County, Iowa, serving about 888 residents. Treatment on site includes covered lagoons. It discharges under NPDES permit IA0032808 (effective), which expires in January 2031, with 1 recorded violation in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Covered lagoons
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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
2 verified contacts for Winthrop City Of STP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Winthrop City Of STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Iowa
Quasqueton · 5 mi away
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Independence · 7 mi away
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Masonville · 8 mi away
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Rowley · 8 mi away
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Aurora · 10 mi away
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Lamont · 11 mi away
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Dundee · 13 mi away
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Walker · 13 mi away
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Winthrop 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 March 28, 2025.