Washington Surface Impoundments regulations & environmental compliance analysis

Washington Surface Impoundments: What you need to know

Governing Law and Regulations

Dangerous waste surface impoundment rules: Washington Administrative Code (WAC) 173-303-650 and 173-303-400(3) (interim status)

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Construction quality assurance program: WAC 173-303-335

Response action plan: WAC 173-303-650(11)

Organic air emission rules: WAC 173-303-691 and WAC 173-303-692

Dangerous waste surface impoundment disposal restrictions: WAC 173-303-140(4) to (7)

Facility location standards: WAC 173-303-282

Additional state design requirements: WAC 173-303-650(2)(d) to (h)

Facility performance standards: WAC 173-303-283

Regulatory Agency

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

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Washington's dangerous waste surface impoundment requirements include both the federal rules and the state's more stringent requirements. The state's more stringent requirements apply to disposal restrictions, location standards, design requirements, and facility performance standards.

Administration and enforcement. The Washington Department of Ecology's (WDOE) Hazardous Waste and Toxics Reduction Program administers and enforces the dangerous waste surface impoundment requirements in Washington, including the organic air emission standards.

State Requirements


WAC 173-303-140

Washington has disposal restrictions in addition to the federal land disposal restrictions, which are reviewed in the national section LAND DISPOSAL RESTRICTIONS/LAND BAN.

Waste-specific bans. In general, Washington restricts the disposal of the following wastes in surface impoundment facilities (WAC 173-303-140(4)

Read more about Surface Impoundments