Mitchell County WW Pretreatment Plant
Osage, IA · Mitchell County · Publicly Owned Treatment Works
- Average flow
- 0.03 MGD
- Design flow
- —
- NPDES permit
- MO0030821
- Administratively continued
- Permit expires
- June 2026
- Population served
- 841
- CWNS 2022
Mitchell County WW Pretreatment Plant is a publicly owned wastewater treatment works in Osage, Mitchell County, Iowa treating an average of 0.03 million gallons per day, serving about 841 residents. Treatment on site includes carrousels / oxidation ditches, biogas silos, lagoon, aerobic. It discharges under NPDES permit MO0030821 (administratively continued), which expires in June 2026, with 111 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Carrousels / oxidation ditches
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Biogas silos
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Lagoon, Aerobic
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Compliance snapshot (last 3 years)
- Total violations
- 111
- Effluent violations
- 111
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Mitchell County WW Pretreatment Plant, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Mitchell County WW Pretreatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Iowa
Osage · 1 mi away
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Orchard · 5 mi away
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St. Ansgar · 8 mi away
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Stacyville · 10 mi away
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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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Mitchell County WW Pretreatment Plant: 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 August 5, 2026.