Washington Revised Code Title 80. Public Utilities § 80.28.140. Inspection of gas and water meters

The commission may appoint inspectors of gas and water meters whose duty it shall be when required by the commission to inspect, examine, prove and ascertain the accuracy of any and all gas and water meters used or intended to be used for measuring or ascertaining the quantity of gas for light, heat or power, or the quantity of water furnished for any purpose by any public service company to or for the use of any person or corporation, and when found to be or made to be correct such inspectors shall seal all such meters and each of them with some suitable device to be prescribed by the commission.

No public service company shall thereafter furnish, set or put in use any gas or water meter which shall not have been inspected, proved and sealed by an inspector of the commission under such rules and regulations as the commission may prescribe.