WA HB2183

Counties planning under the Growth Management Act must create and adopt extreme heat response plans by July 1, 2027, developed by local boards of health in cooperation with city public health and emergency departments

Plans must address both immediate response during extreme heat events and long-term adaptation strategies, including cooling measures beyond cooling centers

High-risk populations prioritized for protection include those 65 and older, outdoor workers, medically vulnerable individuals, pregnant women, children under 6, and households earning 80% or less of area median income

Required plan elements include tribal partnerships, public outreach and early warning systems, building adaptation recommendations (subsidies for heat pumps, cooling units), medical emergency protocols, and data collection on heat-related illness and mortality

Counties must review and revise their heat response plans during comprehensive plan updates required under RCW 36.70A.130