Osage City Of STP
Osage, IA · Mitchell County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 1.69 MGD
- NPDES permit
- IA0032956
- Effective
- Permit expires
- January 2030
- Population served
- 3,710
- CWNS 2022
Osage City Of STP is a publicly owned wastewater treatment works in Osage, Mitchell County, Iowa, serving about 3,710 residents. Treatment on site includes carrousels / oxidation ditches, biogas balloons. It discharges under NPDES permit IA0032956 (effective), which expires in January 2030, with 50 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
- 50
- Effluent violations
- 50
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Osage 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 Osage City Of STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Iowa
Osage · 1 mi away
0.03 MGD
Orchard · 5 mi away
—
St. Ansgar · 8 mi away
—
Stacyville · 10 mi away
—
Rudd · 11 mi away
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Floyd · 11 mi away
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Grafton · 13 mi away
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Nora Springs · 13 mi away
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Osage 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 6, 2025.