Wash. Admin. Code § 468-34-350
Consistent with federal, state, or local laws or regulations all utility installations within the highway right of way shall be located in accordance with the control zone guidelines. The control zone guidelines govern the location of utilities within the right of way for the following:
[Statutory Authority: Chapter 47.44 RCW. WSR 89-05-022 (Order 119), § 468-34-350, filed 2/10/89.]