Astoria STP
5555 Lagoon Rd, Astoria, OR 97103 · Clatsop County · Publicly Owned Treatment Works
- Average flow
- 4.38 MGD
- Design flow
- 5 MGD
- NPDES permit
- OR0027561
- Administratively continued
- Permit expires
- October 2016
- Population served
- 10,404
- CWNS 2022
Astoria STP is a publicly owned wastewater treatment works in Astoria, Clatsop County, Oregon treating an average of 4.38 million gallons per day against a permitted design capacity of 5 MGD, serving about 10,404 residents. It discharges under NPDES permit OR0027561 (administratively continued), which expires in October 2016, with 14 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in March 2006.
Treatment technology
2 treatment structures and unit processes identified at Astoria STP.
Available with a free Klarifi account
See the full treatment train at Astoria STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 14
- Effluent violations
- 5
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 Astoria STP in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- Penalties assessed
- $2,410
- all cases
- Compliance actions
- $2,410
- required by EPA orders
- EPA inspections
- 1
- latest Jul 2005
Latest case · Mar 2006
CITY OF ASTORIA WASTEWATER TREATMENT FACILITY
Administrative order · CAA, Prevention of Accidental Release/Risk Management Plans (RMPs) · Final Order With Penalty · Penalty $2,410 · Compliance actions $2,410
EPA's description of the case:
“Three EPA representatives inspected the City of Astoria Wastewater Treatment Facility on July 11 and 15th, 2005. Based upon this inspection, EPA believes City of Astoria Wastewater Treatment is in…”
Unlock EPA's full description by creating a free account on Klarifi. Create a free account →
Source: EPA ECHO, civil enforcement case 10-2006-0061.
Full case history with a free Klarifi account
Every action against Astoria STP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Capital improvement projects in Astoria
Astoria's capital improvement plan lists 12 water, sewer and wastewater line items worth $49M starting 2023–2034. The largest budgeted items are shown here.
All water and sewer capital projects in Astoria →
| Project | Budget | Years |
|---|---|---|
| Sanitary Sewer Pipe Interceptor Comprehensive Evaluation (including cleaning)and Replacement/Rehabilitation Project | $10,000,000 | 2030–2034 |
| WWTP Headworks Improvements Project | $9,869,232 | 2023–2026 |
| Clearwell and Laboratory at the Water Treatment Plant | $6,000,000 | 2028–2028 |
| Little Bear Creek Waterline Resilience Project | $5,000,000 | 2030–2030 |
| Bear Creek Dam Emergency Spillway Project | $3,878,000 | 2034–2034 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
2 verified contacts for Astoria STP, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Astoria STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Oregon
Warrenton · 7 mi away
—
Seaside · 15 mi away
1.65 MGD
Clatskanie · 20 mi away
0.04 MGD
Cannon Beach · 23 mi away
0.59 MGD
Clatskanie · 28 mi away
0.29 MGD
Arch Cape · 29 mi away
0.13 MGD
Nehalem · 34 mi away
0.87 MGD
Vernonia · 37 mi away
0.39 MGD
Astoria 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 February 16, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Activated sludge · Oxidation ditch · all terms