Arlington STP
Arlington, OR · Gilliam County · Publicly Owned Treatment Works
- Average flow
- 0.05 MGD
- Design flow
- 0.13 MGD
- NPDES permit
- OR0020192
- Administratively continued
- Permit expires
- December 2024
- Population served
- —
- CWNS 2022
Arlington STP is a publicly owned wastewater treatment works in Arlington, Gilliam County, Oregon treating an average of 0.05 million gallons per day against a permitted design capacity of 0.13 MGD. It discharges under NPDES permit OR0020192 (administratively continued), which expires in December 2024, with 4 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 4
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Arlington STP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Oregon
Biggs · 30 mi away
0.03 MGD
Heppner · 40 mi away
0.07 MGD
Umatilla · 44 mi away
0.72 MGD
Hermiston · 44 mi away
1.56 MGD
Stanfield · 48 mi away
0.15 MGD
Dufur · 48 mi away
0.0027 MGD
Maupin · 57 mi away
0.06 MGD
Mosier · 58 mi away
0.07 MGD
Arlington 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 November 18, 2025.