Wash. Rev. Code § 8.12.030
Every city and town and each unclassified city and town within the state of Washington, is hereby authorized and empowered to condemn land and property, including state, county and school lands and property for streets, avenues, alleys, highways, bridges, approaches, culverts, drains, ditches, public squares, public markets, city and town halls, jails and other public buildings, and for the opening and widening, widening and extending, altering and straightening of any street, avenue, alley or highway, and to damage any land or other property for any such purpose or for the purpose of making changes in the grade of any street, avenue, alley or highway, or for the construction of slopes or retaining walls for cuts and fills upon real property abutting on any street, avenue, alley or highway now ordered to be, or such as shall hereafter be ordered to be opened, extended, altered, straightened or graded, or for the purpose of draining swamps, marshes, tidelands, tide flats or ponds, or filling the same, within the limits of such city, and to condemn land or property, or to damage the same, either within or without the limits of such city for public parks, drives and boulevards, hospitals, pesthouses, drains and sewers, garbage crematories and destructors and dumping grounds for the destruction, deposit or burial of dead animals, manure, dung, rubbish, and other offal, and for aqueducts, reservoirs, pumping stations and other structures for conveying into and through such city a supply of fresh water, and for the purpose of protecting such supply of fresh water from pollution, and to condemn land and other property and damage the same for such and for any other public use after just compensation having been first made or paid into court for the owner in the manner prescribed by this chapter.
RCW 8.12.030