Wallowa STP
700 N Pine St, Wallowa, OR 97885 · Wallowa County · Publicly Owned Treatment Works
- Average flow
- 0.1 MGD
- Design flow
- 0.2 MGD
- NPDES permit
- OR0020028
- Effective
- Permit expires
- May 2028
- Population served
- 906
- CWNS 2022
Wallowa STP is a publicly owned wastewater treatment works in Wallowa, Wallowa County, Oregon treating an average of 0.1 million gallons per day against a permitted design capacity of 0.2 MGD, serving about 906 residents. It discharges under NPDES permit OR0020028 (effective), which expires in May 2028, with 6 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Wallowa STP.
Available with a free Klarifi account
See the full treatment train at Wallowa STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 6
- 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 Wallowa STP.
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Nearby wastewater treatment plants in Oregon
Enterprise · 15 mi away
0.24 MGD
Elgin · 18 mi away
0.2 MGD
Joseph · 21 mi away
0.15 MGD
Union · 31 mi away
0.14 MGD
North Powder · 42 mi away
0.05 MGD
Athena · 49 mi away
0.2 MGD
Stanfield · 83 mi away
—
Huntington · 86 mi away
0.15 MGD
Wallowa 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 October 26, 2026; facility record last updated September 16, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Oxidation ditch · Anaerobic digester · all terms