Tesoro Refining & Marketing Company
W March Pt Rd, Anacortes, WA 98221


We invite you comment on the following dangerous waste corrective action permit, Agreed Order, State Environmental Policy Act (SEPA) Determination of Nonsignificance (DNS), and supporting documents for Tesoro's Marathon Anacortes refinery's oily water sewer.

While we're not aware of any current releases from the oily water sewer, these include requirements to investigate and clean up any soil or groundwater contamination. Contaminants of concern include metals, volatile organics, and semi-volatile organics.

Read the public comment notice for more information on where to submit comments.

A comment period on the Shell Puget Sound refinery's oily water sewer is taking place during this same time.

Public hearing
An online public meeting followed by a hearing on this and the Shell refinery action will take place:

May 20, 2021
Starting at 4 p.m.
Register or join online


Tesoro's Marathon refinery is located on West March Point Road in Anacortes, WA. It processes an average of 105,000 barrels of crude oil each day to make a variety of petroleum products.

Learn more about current operations

Leaded Tank Farm Disposal Areas

Tank dike areas in the main tank farm were used for burying tank bottoms from leaded gasoline tanks. Contaminants of concern include:
  • Benzene, toluene, ethyl benzene, and total xylenes (BTEX)
  • Polycyclic aromatic hydrocarbons (PAHs)
  • Dissolved arsenic
  • Dissolved chromium
  • Dissolved lead 
Tesoro installed five new monitoring wells in January 2014 to investigate contamination in groundwater.


Map showing site location as Skagit County, WA SITE INFORMATION


View Electronic Documents

Cleanup Site Details Report

Facility Site ID: # 6

Cleanup Site ID: 2212

Anacortes, Skagit County

Status: Cleanup Started   Get definitions of Status terminology

Comment Period:
APRIL 07, 2021 - JUNE 07, 2021

Kim Wigfield
Site Manager
(360) 407-6931

Angie Fritz
Public Involvement Coordinator
(360) 407-7393

Document Repositories:

Industrial Section
300 Desmond Dr SE
Lacey, 98503-1274