Joseph STP
Valley View Rd, Joseph, OR 97846 · Wallowa County · Publicly Owned Treatment Works
- Average flow
- 0.15 MGD
- Design flow
- 0.77 MGD
- NPDES permit
- OR0020605
- Effective
- Permit expires
- December 2029
- Population served
- 1,756
- CWNS 2022
Joseph STP is a publicly owned wastewater treatment works in Joseph, Wallowa County, Oregon treating an average of 0.15 million gallons per day against a permitted design capacity of 0.77 MGD, serving about 1,756 residents. It discharges under NPDES permit OR0020605 (effective), which expires in December 2029, with 2 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Joseph STP.
Available with a free Klarifi account
See the full treatment train at Joseph STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 2
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Joseph STP.
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Nearby wastewater treatment plants in Oregon
Enterprise · 5 mi away
0.24 MGD
Wallowa · 21 mi away
0.1 MGD
Union · 34 mi away
0.14 MGD
Elgin · 36 mi away
0.2 MGD
North Powder · 41 mi away
0.05 MGD
Athena · 69 mi away
0.2 MGD
Huntington · 71 mi away
0.15 MGD
Ontario · 93 mi away
1.87 MGD
Joseph 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 November 7, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Sludge dewatering · Biological nutrient removal · all terms