§ 4.12.060. Type of protection required.

A.

In the case of any premises where there is an auxiliary water supply that is not subject to any of the following rules, the District's system shall be protected by an approved air gap separation or an approved reduced pressure principle backflow prevention assembly.

B.

In the case of any premises where there is water or a substance that would be objectionable but not hazardous to health if introduced into the District's system, the District's system shall be protected by an approved double-check valve assembly.

C.

In the case of any premises where there is any material dangerous to health which is handled in such a fashion as to create an actual or potential, hazard to the District's system, the District's system shall be protected by an approved reduced pressure principle backflow prevention assembly. Examples of premises where actual, or potential, health hazards, or conditions, will exist include, but are not limited to, the following: sewage treatment plants, sewage pumping stations, chemical manufacturing plants, hospitals, mortuaries, plating works, etc.

D.

In the case of any premises were there are "uncontrolled" cross-connections, either actual or potential, i.e., where plumbing code violations exist, the District's system shall be protected by an approved air gap separation or an approved reduced pressure principle backflow prevention assembly at the service connection.

E.

In the case of any premises where, because of security requirements or other prohibitions or restrictions, it is impossible, or impractical, to make a complete in-plant cross-connection survey, the District's system shall be protected against backflow from the premises by installation of a backflow prevention assembly in the owner's system adjacent to, or close to the District's meter. In this case, maximum protection will be required, i.e., an approved air gap separation or an approved reduced pressure principle backflow prevention assembly shall be installed in each service to the premises.

(Ord. 29-A § 6, 1994)