13.08.070 Backflow-prevention devices—Type.
The type of prevention device required by the city depends on the degree of hazard which exists as follows:
A. An air-gap separation or reduced-pressure backflow-prevention device shall be installed where the water supply may be contaminated by sewage, industrial waste of a toxic nature, or other contaminant which would cause a health hazard.
B. In the case of a substance which may be objectionable but not hazardous to health, a double check-valve assembly, air-gap separation or reduced-pressure-principle backflow-prevention device shall be installed.
C. Pressure-type vacuum breaker units (spring loaded) are the approved units for city-supplied irrigation systems. The unit must be installed at least twelve inches above the highest fixture point of water usage and in such a manner that drainage will preclude back pressure. (Ord. 88-14 § 7, 1988)