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See national section for basic information and federal regulations.
Comparison: State vs. Federal
• Rules. Washington has adopted the federal accumulation time rule, which allows large quantity generators (LQGs) to accumulate hazardous waste for up to 90 days without a permit. However, Washington's rules for its other generators are different from the federal, in part because the state does not use the federal definitions of small quantity generators (SQGs) and conditionally exempt small quantity generators (CESQGs). 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 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. In addition to these differences, any MQG in Washington that wishes to extend its accumulation period beyond 180 days may do so only with WDOE's approval.