Section 22.19 - Distribution System RequirementsIn order to protect the distribution system of a public water system from contamination the following requirements shall be applied:
(1) All service connections shall have a minimum residual water pressure at street level of at least 20 pounds per square inch under all design conditions of flow.(2)Water Storage Tanks. All water storage tanks used for the storage of ground or treated water which are connected to a distribution system of a public water system shall be covered and constructed and located so as to adequately protect the water from contamination. Tank vents and overflow pipes shall be properly screened to prevent contamination and not be directly connected to sanitary sewers or to storm drainage systems. Sewers, drains, standing water and similar sources of possible contamination must be kept at least 50 feet from the tank. Water main pipe, pressure tested to 50 pounds per square inch without leakage, may be used for gravity sewers at distances greater than 20 feet and less than 50 feet from said water storage tank.(3)Storage Reservoirs. Open or uncovered earth embankment or reinforced concrete reservoirs, which are connected to a distribution system of a public water system, and used to store ground or treated water whose intended purpose is to equalize hourly and daily fluctuations of water, may continue to be used provided that said facility complies with the requirements of 310 CMR 22.20A.(4)Construction Materials Evaluation. Community water supply systems shall identify whether the following construction materials are present in their distribution system and report to the Department: (a) Lead from piping, solder, caulking, interior lining of distribution mains, alloys and home plumbing;(b) Copper from piping and alloys, service lines, and home plumbing;(c) Galvanized piping, service lines, and home plumbing;(d) Ferrous piping materials such as cast iron and steel; and(e) Asbestos cement pipe.(5)Identification and Reporting of Other Materials of Construction. In addition, the Department may require identification and reporting of other materials of construction present in distribution systems that may contribute contaminants to the drinking water such as:(a) Vinyl lined asbestos cement pipe; and(b) Coal tar lined pipes and tanks.(6) All suppliers of water shall develop, update and maintain maps and any relevant associated databases of their water system distribution system that include locations of wells, surface water intakes, treatment facilities, pumping stations, storage tanks, hydrants, direction of flow, pressure zones, sample collection points and other information, such as piping materials and pipe sizes, as requested by the Department. The supplier shall make these maps available to the Department upon request.Amended by Mass Register Issue 1309, eff. 3/25/2016.