North Powder STP
North Powder, OR · Union County · Publicly Owned Treatment Works
- Average flow
- 0.04 MGD
- Design flow
- 1 MGD
- NPDES permit
- OR0022403
- Effective
- Permit expires
- September 2028
- Population served
- —
- CWNS 2022
North Powder STP is a publicly owned wastewater treatment works in North Powder, Union County, Oregon treating an average of 0.04 million gallons per day against a permitted design capacity of 1 MGD. Treatment on site includes aerated lagoons. It discharges under NPDES permit OR0022403 (effective), which expires in September 2028, with 23 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Aerated lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 23
- 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 North Powder STP.
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Nearby wastewater treatment plants in Oregon
Union · 12 mi away
0.12 MGD
Elgin · 38 mi away
0.09 MGD
Enterprise · 41 mi away
0.24 MGD
Joseph · 41 mi away
0.12 MGD
Wallowa · 42 mi away
0.1 MGD
Huntington · 57 mi away
0.04 MGD
Athena · 61 mi away
0.1 MGD
Long Creek · 63 mi away
0.03 MGD
North Powder 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 August 14, 2026.