The type of protection required under this article shall depend on the degree of hazard that exists as follows:
(A) An approved air gap separation or an approved reduced pressure principal backflow prevention device shall be installed where a public water supply system may be contaminated with any substance that could cause a system hazard or health hazard;
(B) An approved double check valve assembly shall be installed where a public water supply system may be contaminated with any substance that could cause a pollution hazard;
(C) An approved reduced pressure principal backflow prevention device shall be installed at the service connection where there exists a plumbing hazard; or
(D) In the case of any premises where, because of security requirements or other prohibitions, it is impossible or impractical to make a complete cross-connection survey of the consumer’s potable water system, a reduced pressure principal backflow prevention device shall be installed at the service connection.
(Ord. 3261, passed - -1992)