(A) The type of protection required under § 52.09(B)(1),(2) and (3) shall depend on the degree or hazard which exists as follows:
(1) An approved fixed proper air gap separation shall be installed where the public water supply system may be contaminated with substances that could cause a severe health hazard;
(2) An approved fixed proper air gap separation or an approved reduced pressure principle backflow prevention device shall be installed where the public water supply system may be contaminated with a substance that could cause a system or health hazard; and
(3) An approved fixed proper air gap separation or an approved reduced pressure principle backflow prevention device shall be installed where the public water supply system may be polluted with substances that could cause a pollution hazard not dangerous to health.
(B) The type of protection required under § 52.09(B)(4) shall be an approved fixed proper air gap separation or an approved reduced pressure principle backflow prevention device.
(C) Where a public water supply or an auxiliary water supply is used for a fire protection system, reduced pressure principle backflow preventers shall be installed on fire sprinkler systems connected to the public water supply when:
(1) The sprinkler system contains antifreeze;
(2) Water is pumped into the system from another source; or
(3) There is a connection whereby another source can be connected to the sprinkler system.
(Ord. 88-10, passed 10-24-88)