Onslow City Of STP
Onslow, IA · Jones County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- IA0057134
- Effective
- Permit expires
- October 2029
- Population served
- 201
- CWNS 2022
Onslow City Of STP is a publicly owned wastewater treatment works in Onslow, Jones County, Iowa, serving about 201 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit IA0057134 (effective), which expires in October 2029, with 1 recorded violation 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
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Onslow 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 Onslow City Of STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Iowa
Wyoming · 3 mi away
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Center Junction · 4 mi away
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Baldwin · 8 mi away
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Oxford Junction · 9 mi away
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Olin · 10 mi away
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Monticello · 13 mi away
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Lost Nation · 14 mi away
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Anamosa · 15 mi away
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Onslow 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 16, 2025.