Warrenton STP
105 NE 5th St, Warrenton, OR 97146 · Clatsop County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.5 MGD
- NPDES permit
- OR0020877
- Administratively continued
- Permit expires
- November 2025
- Population served
- 6,013
- CWNS 2022
Warrenton STP is a publicly owned wastewater treatment works in Warrenton, Clatsop County, Oregon, serving about 6,013 residents. It discharges under NPDES permit OR0020877 (administratively continued), which expires in November 2025, with 0 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in May 2017.
Treatment technology
One treatment structure or unit process identified at Warrenton STP.
Available with a free Klarifi account
See the full treatment train at Warrenton STP: structures, unit processes and planned upgrades, with exact unit counts.
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.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Warrenton STP in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- EPA inspections
- 0
- none on record
Latest case · May 2017
CITY OF WARRENTON, OREGON
Administrative order · CWA, Permits for Dredge and Fill Material · Final Order No Penalty
Source: EPA ECHO, civil enforcement case 10-1997-0158.
Full case history with a free Klarifi account
Every action against Warrenton STP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Warrenton STP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Oregon
Astoria · 7 mi away
4.38 MGD
Seaside · 12 mi away
1.65 MGD
Cannon Beach · 19 mi away
0.59 MGD
Arch Cape · 26 mi away
0.13 MGD
Clatskanie · 26 mi away
0.04 MGD
Nehalem · 32 mi away
0.87 MGD
Clatskanie · 34 mi away
0.29 MGD
Rockaway Beach · 39 mi away
0.29 MGD
Warrenton 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 August 3, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms