The type of protection required by this chapter shall depend on the degree of hazard which exists as follows.
(A) An approved air gap separation shall be installed where the potable water system may be contaminated with substances that could cause a severe health hazard.
(B) An approved air gap separation or an approved reduced pressure principle backflow prevention device shall be installed where the public potable water system may be contaminated with a substance that could cause a health hazard.
(C) An approved air gap separation or an approved reduced pressure principle backflow prevention device, or an approved double check valve assembly shall be installed where the public potable water system may be polluted with substances that could cause a pollutional hazard not dangerous to health.
(Prior Code, § 3-124)