Provides that regulations adopted under this act may not require modifications to or otherwise limit ongoing, preexisting agricultural activities occurring on agricultural lands if the parcel that would otherwise be subject to regulation under this act: (1) Is ten or fewer acres in size; and

(2) Is not a subset of a larger agricultural land area owned by the same property owner or owners.

Declares that "agricultural activities" as used in this act has the same meaning as defined in RCW 90.58.065(2).