Tesoro Refinery

Facility information

The refinery began operating in 1955. Owned by Marathon and doing business as Tesoro, it processes crude oil into a variety of petroleum products and has about 330 employees and 280 contractors that work on the site.

• At full production, the refinery has the ability to process 120,000 barrels of crude oil each day.
• Wastewater from the petroleum-making process is treated and sent to Fidalgo Bay.

Permit information

• Wastewater permit
  • Support document
• Hazardous wast corrective action permit 
  • Support document

The Northwest Clean Air Agency regulates the refinery’s air quality activities. Visit the Northwest Clean Air Agency website or call 800-622-4627 for more information.

Tesoro contacts

Company website
Facility phone: 360-428-1617 or 800-622-4627
Location: West March Point Road, Anacortes, Wash.