Mount Angel STP
Mount Angel, OR · Marion County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.56 MGD
- NPDES permit
- OR0028762
- Administratively continued
- Permit expires
- December 2009
- Population served
- 3,520
- CWNS 2022
Mount Angel STP is a publicly owned wastewater treatment works in Mount Angel, Marion County, Oregon, serving about 3,520 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit OR0028762 (administratively continued), which expires in December 2009, with 45 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
- 45
- 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 Mount Angel STP.
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Nearby wastewater treatment plants in Oregon
Gervais · 5 mi away
0.13 MGD
Brooks · 8 mi away
0.05 MGD
Hubbard · 8 mi away
0.17 MGD
Aurora · 11 mi away
0.08 MGD
Salem · 12 mi away
24.62 MGD
Aumsville · 15 mi away
0.3 MGD
Dayton · 16 mi away
0.16 MGD
Canby · 16 mi away
0.99 MGD
Mount Angel 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 April 6, 2025.