Washington Hazardous Waste Storage regulations & environmental compliance analysis

Washington Hazardous Waste Storage: What you need to know

Governing Law and Regulations

Treatment, storage, and disposal facility (TSDF) container rules: Washington Administrative Code (WAC) 173-303-630 and WAC 173-303-400(3)(a) (interim status)

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TSDF storage tank rules: WAC 173-303-640 and WAC 173-303-400(3)(a) (interim status)

Surface impoundment rules: WAC 173-303-650 and WAC 173-303-400(3)(a) (interim status)

Containment buildings: WAC 173-303-695 and WAC 173-303-400(3)(a) (interim status)

On-site storage rules for generators:

Large quantity generators (LQGs): WAC 173-303-200

Medium quantity generators (MQGs): WAC 173-303-201 and WAC 173-303-202

Small quantity generators (SQGs): WAC 173-303-070(8)

Regulatory Agency

Washington Department of Ecology (WDOE) Hazardous Waste and Toxics Reduction Program

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Washington has adopted the federal rules for storing dangerous (hazardous) wastes and has added several more stringent requirements in connection with dangerous waste storage tanks, surface impoundments, dangerous waste storage facilities, and generators accumulating dangerous wastes on-site.

In addition, and unlike the federal rules, Washington requires owners and operators of dangerous waste storage facilities to meet state performance standards.

Administration and enforcement. The Washington Department of Ecology's (WDOE) Hazardous Waste and Toxics Reduction Program administers and enforces the dangerous waste storage requirements in Washington.

State Requirements


WAC 173-303-630 and WAC 173-303-400

Washington follows the federal container management rules but has additional provisions regarding labeling, storage areas, loading areas, storage of ignitable and reactive ...

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More on this topic:

Governing Law and Regulations
Regulatory Agency
Comparison: State vs. Federal
State Requirements