Seaside WWTP
1821 N Franklin St, Seaside, OR 97138 · Clatsop County · Publicly Owned Treatment Works
- Average flow
- 1.65 MGD
- Design flow
- 2.25 MGD
- NPDES permit
- OR0020401
- Effective
- Permit expires
- July 2029
- Population served
- 6,875
- CWNS 2022
Seaside WWTP is a publicly owned wastewater treatment works in Seaside, Clatsop County, Oregon treating an average of 1.65 million gallons per day against a permitted design capacity of 2.25 MGD, serving about 6,875 residents. It discharges under NPDES permit OR0020401 (effective), which expires in July 2029, with 27 recorded violations in the last three years. EPA has recorded 2 formal enforcement actions naming the plant, the latest in August 2024.
Treatment technology
3 treatment structures and unit processes identified at Seaside WWTP.
Available with a free Klarifi account
See the full treatment train at Seaside WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 27
- Effluent violations
- 17
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 Seaside WWTP in EPA's ICIS system.
- Formal actions
- 2
- 1 since FY2020
- Penalties assessed
- $5,250
- all cases
- Compliance actions
- $100
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Aug 2024
CITY OF SEASIDE WASTEWATER TREATMENT PLANT
Administrative order · CWA, NPDES Permit Violations · Final Order With Penalty · Penalty $3,750 · Compliance actions $100
EPA's description of the case:
“On August 20, 2024, Region 10 issued an expedited settlement agreement and final order to the City of Seaside Wastewater Plant located in Seaside, Oregon. Alleged violations included failure to…”
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Source: EPA ECHO, civil enforcement case 10-2024-0056.
Full case history with a free Klarifi account
Every action against Seaside WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Seaside WWTP.
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Nearby wastewater treatment plants in Oregon
Cannon Beach · 8 mi away
0.59 MGD
Warrenton · 12 mi away
—
Arch Cape · 14 mi away
0.13 MGD
Astoria · 15 mi away
4.38 MGD
Nehalem · 20 mi away
0.87 MGD
Rockaway Beach · 27 mi away
0.29 MGD
Clatskanie · 28 mi away
0.04 MGD
Rockaway Beach · 29 mi away
0.15 MGD
Seaside WWTP: 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 7, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms