Wash. Admin. Code § 480-90-353
(1) Gas utilities must establish records showing the history of each meter purchased and installed. Each record must be maintained for the life of the meter, plus three months. The forms of such records are subject to commission approval and must contain the following information, at a minimum:
(2) The utility must maintain the meter history from the meter's last shop maintenance and "out proof test" through service, removal and "in proof test," plus six months. The records are subject to approval of the commission and must contain, at a minimum, the following information:
[Statutory Authority: RCW 80.01.040 and 80.04.160. WSR 01-11-003 (Docket No. UG-990294, General Order No. R-484), § 480-90-353, filed 5/3/01, effective 6/3/01.]