Wash. Rev. Code § 80.28.160
Every gas company, electrical company, water company, and thermal energy company shall prepare and maintain such suitable premises, apparatus and facilities as may be required and approved by the commission for testing and proving the accuracy of gas, electric, water, or thermal energy meters furnished for use by it by which apparatus every meter may be tested.
[ 2025 c 263 s 20; 1961 c 14 s 80.28.160. Prior: 1911 c 117 s 74, part; RRS s 10410, part.]