Arch Cape STP
Arch Cape, OR · Clatsop County · Publicly Owned Treatment Works
- Average flow
- 0.08 MGD
- Design flow
- 0.5 MGD
- NPDES permit
- OR0027499
- Effective
- Permit expires
- February 2027
- Population served
- 363
- CWNS 2022
Arch Cape STP is a publicly owned wastewater treatment works in Arch Cape, Clatsop County, Oregon treating an average of 0.08 million gallons per day against a permitted design capacity of 0.5 MGD, serving about 363 residents. It discharges under NPDES permit OR0027499 (effective), which expires in February 2027, with 0 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
- 0
- 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 Arch Cape STP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Oregon
Cannon Beach · 6 mi away
0.32 MGD
Nehalem · 7 mi away
0.3 MGD
Rockaway Beach · 13 mi away
0.19 MGD
Seaside · 14 mi away
1.2 MGD
Rockaway Beach · 15 mi away
0.08 MGD
Garibaldi · 17 mi away
0.11 MGD
Bay City · 20 mi away
0.17 MGD
Warrenton · 26 mi away
0.76 MGD
Arch Cape 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 26, 2025.