Each public utility shall keep complete maps, plans, and records of its entire distribution and other system showing the size, character, and location of each main, district regulator, street valve and drip, and each service connection, together with such other information as may be necessary. The maps, plans, and records required by the provisions of this section shall be kept up to date so that the utility may promptly and accurately furnish any information regarding its facilities, or copies of its maps, upon request by the Commission.
52 Pa. Code § 59.37