(a) An approved backflow prevention device shall be installed on each service line to a consumer's water system serving premises, where in the judgment of the water purveyor or Health Commissioner of the City, a health, pollutional or system hazard to the public water system exists.
(b) An approved backflow prevention device shall be installed on each service line to a consumer's water system serving premises where the following conditions exist:
(1) Premises having an auxiliary water system, unless the auxiliary system is accepted as an additional source by the water purveyor and the source is approved by the Health Commissioner of the City;
(2) Premises on which any substance is handled in such a fashion as to create an actual or potential hazard to the public water system. This shall include premises having sources or systems containing process fluids or waters originating from a public water system which are no longer under the control of the water purveyor;
(3) Premises having internal cross-connections that, in the judgment of the water purveyor, are not correctable, or intricate plumbing arrangements which make it impracticable to determine whether or not cross-connections exist;
(4) Premises where, because of security requirements or other prohibitions or restrictions, it is impossible or impractical to make a complete cross-connection survey;
(5) Premises having a repeated history of cross-connections being established or re-established; or
(6) Others specified by the Health Commissioner of the City.
(c) An approved backflow prevention device shall be installed on each service line to a consumer's water system serving, but not necessarily limited to, the following types of facilities unless the Health Commissioner of the City determines that no health, pollutional or system hazard to the public water system exists.
(1) All commercial and industrial premises;
(2) All hotels, motels and apartment houses;
(3) All premises designed or used to accommodate three or more family units; and
(4) Others specified by the Health Commissioner of the City, except single and double residential units.
(d) An approved backflow prevention device shall be installed at any point of connection between a public water system or a consumer's potable water system and an auxiliary water system, unless the auxiliary system is accepted as an additional source by the water purveyor and the source is approved by the Health Commissioner of the City.
(1980 Code 52.05; Ord. 7115)