Each utility shall have on file at its principal office located within the state a map, maps or drawings showing the following:
(a) Size, character and location of its active mains, and its abandoned mains if abandoned after February 1, 2005, including valves;
(b) Size and location of each of its active service lines, and its abandoned service lines if abandoned after February 1, 2005, where practicable, provided that in lieu of showing service locations on maps, a card record or other suitable means may be used; and
(c) Layout of all principal metering and regulator stations and production plants to show size, location and character of all major equipment, pipe lines, connections, valves and other equipment used.