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 173-303-172

LQG and MQG: WAC 173-303-200(10) and WAC 173-303-172(13)

Small quantity generators (SQGs): WAC 173-303-171

Satellite accumulation rules: WAC 173-303-174

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 follows the federal requirements for generators accumulating (storing) hazardous waste on-site without a permit through its adoption of the U.S. Environmental Protection Agency's (EPA) Hazardous Waste Generator Improvements Rule, effective in Washington on April 30, 2019. The state has more stringent hazardous waste storage requirements in connection with dangerous waste storage tanks, surface impoundments, dangerous waste storage facilities, and generators accumulating dangerous wastes on-site.

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 ...

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