All wood stoves and pellet stoves sold in the state of Washington must meet Washington emission standards (WAC 173-433). The particulate emissions must be less than or equal to 2.5 grams per hour for catalytic wood stoves and 4.5 grams per hour for non-catalytic wood stoves. Even if a particular unit is EPA-certified, it may not necessarily be Washington-certified.
Any new wood burning device sold, offered for sale, or given away to Washington residents must meet Washington's standards. Even devices that are exempt from EPA certification must meet Washington standards. Wood burning devices include:
Pellet stoves are not exempt from Washington emission standards. All pellet stoves for sale in the state of Washington are subject to AAA testing to prove compliance with state law.
For addtional information on wood stoves and other home heating options visit the Washington State Department of Ecology. View a list of Washington-certified solid fuel burning devices online here.