Snohomish County has no set grass-height limit for residential yards, but every property owner must eradicate Class A noxious weeds and control designated Class B and C noxious weeds under state law, enforced by the county Noxious Weed Control Board.
Unlike many cities, unincorporated Snohomish County does not cap lawn height by ordinance. Weed regulation instead flows from state law: RCW 17.10.140 requires every owner to eradicate Class A noxious weeds and control listed Class B and C weeds within and from their property. RCW 17.10.020 creates a noxious weed control board in each county; the Snohomish County Noxious Weed Control Board publishes the local weed list and, when owners fail to comply, may control the weeds and charge the cost back to the owner. Ordinary overgrown grass alone is generally not a code violation unless it harbors listed noxious weeds or creates a nuisance.
If an owner fails to comply, the county weed board may control noxious weeds or contract for control at the owner's expense (RCW 17.10).
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See how Marysville's weeds & overgrown grass rules stack up against other locations.
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