Wash. Rev. Code § 54.44.030
In carrying out the powers granted in this chapter, each such city, public utility district, or joint operating agency shall be severally liable only for its own acts and not jointly or severally liable for the acts, omissions or obligations of others. No money or property supplied by any such city, public utility district, or joint operating agency for the planning, financing, acquisition, construction, operation or maintenance of any common facility shall be credited or otherwise applied to the account of any other participant therein, nor shall the undivided share of any city, public utility district, or joint operating agency in any common facility be charged, directly or indirectly, with any debt or obligation of any other participant or be subject to any lien as a result thereof. No action in connection with a common facility shall be binding upon any public utility district, city, or joint operating agency unless authorized or approved by resolution or ordinance of its governing body.
RCW 54.44.030