(A) Each service connection from the city water system for supplying water to premises having an auxiliary water supply shall be protected against backflow of water from the premises into the public water system unless the auxiliary water system is accepted as an additional source by the water surveyor, and is approved by the public health agency having jurisdiction.
(B) Each service connection from the city water system for supplying water to premises on which any substance is handled in such a fashion as to permit its entry into the water system, shall be protected against backflow of the water from the premises into the public system. This shall include the handling of process waters and waters originating from the city water supply system which have been subject to deterioration in sanitary quality.
(C) Backflow prevention devices shall be installed on the service connection to any premises that have internal cross-connections unless such cross- connections are abated to the satisfaction of the city and approved by the state or local health department.
('61 Code, § 24.92) (Ord. 604, passed - - )