Wash. Rev. Code § 80.28.130
Whenever the commission finds, after hearing had upon its own motion or upon complaint, that repairs or improvements, to, or changes in, any gas plant, electrical plant, system of sewerage, or water system ought to be made, or that any additions or extensions should reasonably be made thereto, in order to promote the security or convenience of the public or employees, or in order to secure adequate service or facilities for manufacturing, distributing or supplying gas, electricity, wastewater company services, or water, the commission may enter an order directing that such reasonable repairs, improvements, changes, additions or extensions of such gas plant, electrical plant, system of sewerage, or water system be made. The commission may require a large combination utility as defined in section 2 of this act to incorporate any existing pipeline safety and replacement plans under this section into an integrated system plan established under section 3 of this act.
RCW 80.28.130
Findings-Purpose-Limitation of chapter-Effective date- 2011 c 214: See notes following RCW 80.04.010.