Lake Mills City Of STP
Lake Mills, IA · Winnebago County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 1 MGD
- NPDES permit
- IA0027448
- Effective
- Permit expires
- May 2027
- Population served
- 2,240
- CWNS 2022
Lake Mills City Of STP is a publicly owned wastewater treatment works in Lake Mills, Winnebago County, Iowa, serving about 2,240 residents. Treatment on site includes aerated lagoons. It discharges under NPDES permit IA0027448 (effective), which expires in May 2027, with 70 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Aerated lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 70
- Effluent violations
- 70
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Lake Mills 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 Lake Mills City Of STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Iowa
Joice · 6 mi away
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Leland · 7 mi away
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Thompson · 12 mi away
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Fertile · 12 mi away
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Northwood · 16 mi away
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Kensett · 18 mi away
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Crystal Lake · 18 mi away
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Rake · 19 mi away
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Lake Mills 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 7, 2025.