RCW 42.30.060: Ordinances, rules, resolutions, regulations, etc., adopted at public meetings—Notice—Secret voting prohibited.

(1) No governing body of a public agency shall adopt any ordinance, resolution, rule, regulation, order, or directive, except in a meeting open to the public and then only at a meeting, the date of which is fixed by law or rule, or at a meeting of which notice has been given according to the provisions of this chapter. Any action taken at meetings failing to comply with the provisions of this subsection shall be null and void.

(2) No governing body of a public agency at any meeting required to be open to the public shall vote by secret ballot. Any vote taken in violation of this subsection shall be null and void, and shall be considered an "action" under this chapter.