Washington Superfund regulations & environmental compliance analysis

Washington Superfund: What you need to know

Governing Law and Regulations

Model Toxic Control Act (MTCA): Revised Code of Washington (RCW), 70.105D.010 to 70.105D.921

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MTCA cleanup regulations: Washington Administrative Code (WAC) 173-340-100 to 173-340-900

Hazardous site register: WAC 173-340-330

Cleanup program options: WAC 173-340-500 to 173-340-560

Project phases: WAC 173-340-300 to 173-340-390

Regulatory Agency

Washington Department of Ecology (WDOE) Toxics Cleanup Program

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Washington has established its own Superfund rules, called the MTCA cleanup regulations, for the cleanup of hazardous waste sites in the state. In many ways, the state Superfund is modeled after the federal Superfund. For example, Washington has a hazardous sites list, like the federal National Priority List, and the state requires cleanup to be conducted in project phases that are similar to the federal rules.

Washington's Superfund rules are separate from and additional to the federal Superfund rules and procedures.

Administration and enforcement. WDOE administers and enforces the state's Superfund rules in Washington.

State Requirements


WDOE's hazardous site cleanup regulations apply to all sites where there has been a release or threatened release of a hazardous substance that may pose a threat to human health or the environment (WAC 173-340-110).

Facility owners and operators who know of or discover a release of a hazardous substance that may be a threat to health or the environment must report the release to WDOE within 90 days of discovery (WAC 173-340-300). Other releases must be reported under the ...

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