The type of protection required under this section shall depend on the degree of hazard that exists as follows (see Appendix, Table II):
(A) An approved air gap separation or an approved reduced pressure principle 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 principle backflow prevention device shall be installed at the service connection where there exists a plumbing hazard; and
(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 principle backflow prevention device shall be installed at the service connection.
(Prior Code, § 51.106) (Ord. 1493, passed 1-25-1993)