Wash. Admin. Code § 365-196-445
(1) A comprehensive plan may include additional elements, items, or studies dealing with other subjects relating to the physical development within its jurisdiction, including, but not limited to:
(3) The department recommends that counties and cities give strong consideration to including elements on the following within comprehensive plans:
[Statutory Authority: RCW 36.70A.050 and 36.70A.190. WSR 10-03-085, § 365-196-445, filed 1/19/10, effective 2/19/10.]