WA HB1153

Requires the Department of Natural Resources to establish optional model urban forestry ordinances incorporating "tree bank" programs, which allow developers to offset tree removal in one area by planting trees in designated priority areas suffering from environmental inequality, urban heat island effects, or areas benefiting salmon/orca recovery

Prohibits local jurisdictions from requiring retention of significant/landmark trees outside critical areas if such retention would reduce allowed housing density, preclude middle housing or accessory dwelling units, or prevent required access/utility connections

Directs the department to provide developer incentives for retaining significant trees, including options for increased building density/height, reduced lot sizes, reduced landscaping requirements, and reduced setback requirements

Establishes a grant program for cities and counties that adopt the model ordinances, with jurisdictions over 75,000 population required to adopt at least one tree retention incentive to qualify

Contains a contingent effective date clause voiding the act if specific funding is not provided in the omnibus appropriations act by June 30, 2025