About This Project


Skagit County Planning and Development Services oversaw the preparation of an environmental impact statement (EIS) under the State Environmental Policy Act (SEPA) for a project proposed by Tesoro Refining & Marketing Company LLC (Tesoro).

The proposed project includes additions and upgrades to the Tesoro Anacortes refinery’s existing facility in order to produce 15,000 barrels per day of mixed xylenes and to supply cleaner local transportation fuels. Mixed xylene is a compound found in gasoline, and is used to make clothing, plastics and other synthetic products. Details on these facility additions and upgrades are included on the project page of this website.

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