(A) General. A potable water supply system shall be designed, installed, and maintained in such manner as to prevent contamination from nonpotable liquids, solids, or gases from being introduced into the potable water supply through cross-connections or any other piping connections to the system.
(B) Cross-connections prohibited. Cross-connections between potable water systems and other systems or equipment containing water or other substances of unknown or questionable quality are prohibited except when and where, as approved by the Municipal Water and Sewer Department, suitable protective devices such as the reduced pressure zone backflow preventer or equal are installed, tested, and maintained to ensure proper operation on a continuing basis.
(C) Interconnections. Interconnection between two or more public water supplies shall be permitted only with the approval of the state authority having jurisdiction.
(D) Auxiliary supply. When an auxiliary supply of water is used in addition to the potable water supply, exposed auxiliary supply and potable water supply piping shall be identified by distinguishing colors or tags and so maintained that each pipe may be traced readily in its entirety.
(E) Individual water supplies. Cross-connections between an individual water supply and a potable public supply shall not be made unless specifically approved by the Municipal Water and Sewer Department.
(F) Connections to boilers. Potable water connections to boilers shall be made through an air gap or provided with an approved backflow preventer.
(G) Prohibited connections to fixtures and equipment.
(1) Connection to the potable water supply system is prohibited unless protected against backflow in accordance with § 50.38, or as set out herein.
(2) Examples of fixtures and equipment from which the potable water supply system must be protected include:
(a) Bidets;
(b) Operating, dissection, embalming, and mortuary tables or similar equipment. In such installation, the hose used for water supply shall terminate at least 12 inches away from every point of the table or attachments;
(c) Pumps for nonpotable water, chemicals, or other substances. Priming connections may be made only through an air gap; and
(d) Building drainage, sewer, or vent systems.
(H) Refrigerating unit condensers and cooling jackets.
(1) Except where potable water provided for a refrigerator condenser or cooling jacket is entirely outside the piping or tank containing the toxic refrigerant, the inlet connection shall be provided with an approved check valve.
(2) Also adjacent to and at the outlet side of the check valve, an approved pressure relief valve set to relieve at five psi above the maximum water pressure at the point of installation shall be provided if the refrigeration units contain more than 20 pounds of refrigerants.
(Prior Code, § 8-4-3) (Ord. 428, passed 7-1-1982) Penalty, see § 50.99