Stanfield STP
Hinkle Rd And N Sherman St, Stanfield, OR 97875 · Umatilla County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.22 MGD
- NPDES permit
- OR0026972
- Effective
- Permit expires
- September 2027
- Population served
- 2,188
- CWNS 2022
Stanfield STP is a publicly owned wastewater treatment works in Stanfield, Umatilla County, Oregon, serving about 2,188 residents. It discharges under NPDES permit OR0026972 (effective), which expires in September 2027, with 24 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Stanfield STP.
Available with a free Klarifi account
See the full treatment train at Stanfield STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 24
- Effluent violations
- 15
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Stanfield STP.
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Nearby wastewater treatment plants in Oregon
Hermiston · 7 mi away
1.48 MGD
Umatilla · 11 mi away
0.67 MGD
Heppner · 33 mi away
0.13 MGD
Athena · 35 mi away
0.2 MGD
Arlington · 48 mi away
0.06 MGD
Elgin · 65 mi away
0.2 MGD
Long Creek · 73 mi away
0.03 MGD
Union · 76 mi away
0.14 MGD
Stanfield 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 May 24, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · WWTP · Biosolids · all terms