All public drinking water supply systems that are subject to the requirements of § 46-15.3-5.1 shall have a duty:
(1) To manage demand to assure the long-term viability of water resources and water supply, to provide for strategic, prudent, reasonable and necessary use of water supplies, to control and/or curtail water use during periods of diminished water supply availability including droughts; to take such actions as may be necessary to achieve compliance by wholesale and retail customers with requirements for demand management; and
(2) To maintain fiscal integrity and adequate capacity by establishing and maintaining such revenue stabilization funds, operating reserves, debt service reserves, and infrastructure replacement and capital improvement program funds as are necessary; and to institute by December 31, 2013, billing at least as frequently as quarterly.