Marengo City Of STP
Marengo, IA · Iowa County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 1.77 MGD
- NPDES permit
- IA0047937
- Effective
- Permit expires
- June 2026
- Population served
- 2,650
- CWNS 2022
Marengo City Of STP is a publicly owned wastewater treatment works in Marengo, Iowa County, Iowa, serving about 2,650 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit IA0047937 (effective), which expires in June 2026, with 96 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
- 96
- Effluent violations
- 88
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Marengo City Of STP, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Marengo City Of STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Iowa
Marengo · 6 mi away
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Blairstown · 8 mi away
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Homestead · 9 mi away
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Amana · 10 mi away
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Norway · 10 mi away
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Walford · 12 mi away
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Belle Plaine · 13 mi away
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Victor · 13 mi away
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Marengo 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 January 23, 2025.