1509 Columbia St, Port Angeles, WA 98362 · Clallam County · Publicly Owned Treatment Works
Port Angeles WWTP is a publicly owned wastewater treatment works in Port Angeles, Clallam County, Washington treating an average of 2.72 million gallons per day against a permitted design capacity of 21.6 MGD, serving about 21,841 residents. It discharges under NPDES permit WA0023973 (administratively continued), which expires in January 2021, with 0 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in June 1992.
2 treatment structures and unit processes identified at Port Angeles WWTP.
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See the full treatment train at Port Angeles WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Federal civil enforcement cases, compliance inspections and informal actions recorded for Port Angeles WWTP in EPA's ICIS system.
Latest case · Jun 1992
PORT ANGELES, CY OF - POTW
Judicial case · CWA, Violation of Existing AO · Final Order With Penalty · Penalty $8,500
Source: EPA ECHO, civil enforcement case 10-1986-0007.
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Every action against Port Angeles WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Decision-makers at Port Angeles WWTP.
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Sequim · 16 mi away
0.64 MGD
Port Townsend · 29 mi away
0.83 MGD
Nordland · 32 mi away
0.0028 MGD
Friday Harbor · 34 mi away
0.4 MGD
Lopez Island · 37 mi away
0.02 MGD
Orcas · 40 mi away
0.0063 MGD
Clallam Bay · 40 mi away
0.04 MGD
Clallam Bay · 42 mi away
0.09 MGD
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 July 3, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms