Oakesdale STP
Wa-27 And Hume Rd, Oakesdale, WA 99158 · Whitman County · Publicly Owned Treatment Works
- Average flow
- 0.09 MGD
- Design flow
- —
- NPDES permit
- WA0044792
- Administratively continued
- Permit expires
- February 2020
- Population served
- 481
- CWNS 2022
Oakesdale STP is a publicly owned wastewater treatment works in Oakesdale, Whitman County, Washington treating an average of 0.09 million gallons per day, serving about 481 residents. It discharges under NPDES permit WA0044792 (administratively continued), which expires in February 2020, with 7 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Oakesdale STP.
Available with a free Klarifi account
See the full treatment train at Oakesdale STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 7
- Effluent violations
- 5
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Oakesdale STP.
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Nearby wastewater treatment plants in Washington
Tekoa · 10 mi away
0.12 MGD
Rosalia · 11 mi away
0.11 MGD
Palouse · 16 mi away
0.07 MGD
Saint John · 17 mi away
0.07 MGD
Colfax · 17 mi away
0.33 MGD
Fairfield · 19 mi away
0.06 MGD
Spangle · 23 mi away
0.02 MGD
Rockford · 23 mi away
0.07 MGD
Oakesdale 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 8, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Anaerobic digester · Lift station · all terms