Washington Accumulation Time regulations & environmental compliance analysis

Washington Accumulation Time: What you need to know

Governing Law and Regulations

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

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Medium quantity generators (MQGs): WAC 173-303-172

Small quantity generators (SQGs): WAC 173-303-171(1)

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 U.S. Environmental Protection Agency's (EPA) Hazardous Waste Generator Improvements Rule, effective in Washington as of April 30, 2019, which includes standards that allow generators to accumulate hazardous waste on-site without a permit for specific periods of time. While Washington follows the federal accumulation time rule which allows large quantity generators (LQGs) to accumulate hazardous waste for up to 90 days without a permit, the state's rules for its other generators differ from the federal, in part because the state does not use the federal definitions of small quantity generator (SQG) and very small quantity generator (VSQG).

In addition, the period of time during which a Washington generator may accumulate hazardous waste on-site without a permit depends on the "status" of the generator. Generator status in Washington is based both on the generator classification appropriate to the generator's activities and on whether the generator's production or accumulation of a specific waste is less than or greater than the "quantity exclusion limit" (QEL) assigned by the Washington Department of Ecology (WDOE) to that waste. Unique to Washington, a QEL is the quantity, by weight, at which a waste becomes regulated under medium quantity generator (MQG) or LQG requirements. ...

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