Wash. Rev. Code § 47.01.460
(1) The department of transportation may increase the recreational vehicle sanitary disposal fee charged under RCW 46.17.375 as authorized in RCW 43.135.055 by a percentage that exceeds the fiscal growth factor. After consultation with citizen representatives of the recreational vehicle user community, the department of transportation may implement RV account fee adjustments no more than once every four years. RV account fee adjustments must be preceded by an evaluation of the following factors:
[ 2010 c 161 s 1145.]
Effective date—Intent—Legislation to reconcile chapter 161, Laws of 2010 and other amendments made during the 2010 legislative session—2010 c 161: See notes following RCW 46.04.013.