Onamia WWTP
Onamia, MN · Mille Lacs County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.21 MGD
- NPDES permit
- MN0052906
- Effective
- Permit expires
- July 2027
- Population served
- —
- CWNS 2022
Onamia WWTP is a publicly owned wastewater treatment works in Onamia, Mille Lacs County, Minnesota. Treatment on site includes uncovered lagoons. It discharges under NPDES permit MN0052906 (effective), which expires in July 2027, 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
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Onamia WWTP.
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Nearby wastewater treatment plants in Minnesota
Wahkon · 6 mi away
—
Onamia · 11 mi away
0.3 MGD
Ogilvie · 19 mi away
0.04 MGD
Mora · 20 mi away
0.26 MGD
Milaca · 21 mi away
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Foreston · 23 mi away
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Pease · 24 mi away
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Gilman · 27 mi away
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Onamia WWTP: 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 13, 2026.