(A) The type of backflow prevention that shall be required to prevent backflow into the city's water system shall be commensurate with the degree of hazard that exists on the consumer's premises. The type of approved backflow prevention assembly that may be required (listed in increasing levels of protection) includes: an approved double check valve (DC) assembly, an approved double check - detector check (DCDA) valve assembly, an approved reduced pressure principle (RPP) assembly, or an approved air gap separation (AG).
(B) The customer may install a higher level of backflow protection than is required by this subchapter, upon written approval from the Director. Uses not covered by this subchapter shall be evaluated on a case-by-case basis and the Director shall have sole discretion to determine which type of backflow prevention assembly shall be required.
(C) Where a premises has an auxiliary water supply, an approved water supply (supplied by another water purveyor), or an unapproved water supply that is not otherwise subject to the provisions of this subchapter, the city's water system shall be protected against backflow by an approved air gap (AG) separation or by installation and maintenance of an approved reduced pressure principle (RPP) backflow prevention assembly.
(D) Where a premises has any water or substance(s) that would be considered objectionable, but not hazardous, to public health if introduced into the water system, the city's water system shall be protected by installation and maintenance of an approved double check valve (DC) assembly.
(E) Where a premises has any material dangerous to health that is handled in such a fashion as to create an actual or potential hazard to the city's water system (e.g., sewage treatment plants, sewage pumping stations, plating plants, chemical plants, hospitals, and mortuaries), the city's water system shall be protected by an approved air gap (AG) separation or by installation and maintenance of an approved reduced pressure principle (RPP) backflow prevention assembly.
(F) In the case of any premises where there is an uncontrolled cross-connection, either actual or potential, the city's water system shall be protected by an approved air gap (AG) separation or by installation and maintenance of an approved reduced pressure principle (RPP) backflow prevention assembly at the service connection.
(G) In the case of a premises with security requirements or other restrictions that make it impossible or impracticable to conduct a complete onsite cross-connection survey, the city's water system shall be protected against backflow by the installation and maintenance of either an air gap (AG) separation or reduced pressure principle (RPP) backflow prevention assembly at each service connection to the premises.
(H) Where a premises has any internal cross-connection that cannot be permanently corrected and controlled, intricate plumbing and piping arrangements, or where all portions of the premises are not readily accessible for inspection purposes, and it is impracticable or impossible to ascertain whether or not a dangerous cross-connection exists, the city's water system shall be protected against backflow by the installation and maintenance of an approved air gap (AG) separation or reduced pressure principle (RPP) backflow prevention assembly at each service connection to the premises.
(Ord. 1129, passed 6-20-23)