Anacortes Former Water Treatment Plant
Facility Site ID:
79423677
Cleanup Site ID:
13264
Current Status
Ecology held a comment period (June 2 - July 1, 2025) to remove the site from the Contaminated Sites List. Ecology received no comments during the comment period, and the site has now been delisted.
A periodic review by Ecology will be conducted every five years to ensure compliance requirements are being met.
Cleanup construction at the former water treatment plant site next to the Skagit River in Mount Vernon was completed between July 2023 and April 2024. Actions included removing PCB-contaminated soil and building materials, demolishing old structures, disposing of regulated materials, conducting confirmation sampling, and restoring the site. Final backfilling with lagoon soil will be done separately by the City of Anacortes, whose current treatment plant operates next to the cleaned site.
A periodic review by Ecology will be conducted every five years to ensure compliance requirements are being met.
Cleanup construction at the former water treatment plant site next to the Skagit River in Mount Vernon was completed between July 2023 and April 2024. Actions included removing PCB-contaminated soil and building materials, demolishing old structures, disposing of regulated materials, conducting confirmation sampling, and restoring the site. Final backfilling with lagoon soil will be done separately by the City of Anacortes, whose current treatment plant operates next to the cleaned site.
General Cleanup Process
The Model Toxics Control Act (MTCA) is Washington’s environmental cleanup law. It provides requirements for contaminated site cleanup and sets standards that protect human health and the environment. Ecology enacts the MTCA and oversees cleanups. The MTCA site cleanup process is completed in steps (see graphic below) over a variable timeline.
Documents 31
Legal 4
| Document Title | Document Date | Document Type |
| Anacortes Former Water Treatment Plant Consent Decree Final | 12/10/2021 | Consent Decree |
| Anacortes Former Water Treatment Plant - DRAFT Consent Decree - May 2021 | 5/20/2021 | Consent Decree |
| Anacortes Former Water Treatment Plant - FINAL Agreed Order with Exhibits - August 2019 | 8/28/2019 | Agreed Order |
| Anacortes Former Water Treatment Plant - Early Notice Letter | 6/15/2017 | Early Notice Letter |
Outreach Information 12
State Environmental Policy Act 1
| Document Title | Document Date | Document Type |
| Anacortes Former Water Treatment Plant - SEPA DNS and Checklist - May 2021 | 5/19/2021 | SEPA Documents |
Technical Reports 14
There may be more documents related to this site. To obtain documents not available electronically, you will need to make a public records request.
Places to see print documents
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Northwest Regional Office15700 Dayton Ave NShoreline, 98133Please schedule an appointment to view print documents at this location.
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Ecology Bellingham Field Office913 Squalicum Way, Unit 101Bellingham, 98225This location may only have print documents available during open comment periods.
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City of Anacortes City Hall904 6th StreetAnacortes, 98221This location may only have print documents available during open comment periods.
Contaminants 1
| Contaminant Type | Soil |
Groundwater |
Surface Water |
Air |
Sediment |
Bedrock |
|---|---|---|---|---|---|---|
| Halogenated Organics - Polychlorinated biPhenyls (PCB) | RB | B |
- S
- Suspected
- C
- Confirmed Above Cleanup Levels
- B
- Below Cleanup Levels
- RA
- Remediated-Above
- RB
- Remediated-Below
- R
- Remediated
This contaminant list was based on our best information at the time it was entered. It may not reflect current conditions at the site.