Spills photo identifier

Spills Program

Spills Prevention

Spill prevention is the primary mission of the Spills Program. The primary objective of the state is to achieve a zero spills strategy to prevent any oil or hazardous substances from entering waters of the state.

Class 1 facility

Class 1 facilities are large, fixed shore-side facilities such as refineries, refueling terminals, and oil pipelines - including facilities that transfer to or from tank vessels and pipelines.

Class 2 Facility

Class 2 facilities are mobile facilities such as tank trucks, railcars, and portable tanks.

Class 3 facility

Class 3 facilities are small tank farms and terminals that transfer oil to non-recreational* vessels that have a fuel capacity of 10,500 gallons or more.

Class 4 facility

Class 4 facilities are marinas or other small fueling facilities that transfer oil to non-recreational vessels with a total oil capacity of less than 10,500 gallons.

Vessel inspector

Tank, cargo and passenger vessels over 300 gross tons are inspected by Ecology.

Risk Assessment

Ecology conducts oil transportation risk assessments in order to better protect public health and safety, and prevent environmental impacts.


Ecology provides recommendations and safety-focused information for vessel and facility operators and crews to help prevent future incidents.

Certification programs

Ecology offers a voluntary exceptional compliance program for tank vessels and participates in the Clean Marina Washington program.