(A) Type of protection required. The type of protection required by this subchapter shall be of a model or construction approved by the Municipal Water Department.
(1) An approved air gap separation shall be installed where the public potable water system may be contaminated with substances that could cause a severe health hazard.
(2) An approved air gap separation or an approved reduced pressure principal backflow prevention device shall be installed where the public potable water system may be contaminated with a substance that could cause a health hazard.
(3) An approved air gap separation or an approved reduced pressure principal backflow prevention device or an approved double check valve assembly shall be installed where the public potable water system may be polluted with substances what could cause a pollution hazard not dangerous to health.
(Prior Code, § 3-127)
(B) Where protection is required.
(1) An approved backflow prevention device shall be installed in the service connection line to a consumer’s water system within any premises where a building that will have water service is being constructed, including any commercial, industrial or residential building, where the service line from the meter to the house is being repaired or reconstructed, where there is any remodeling of a water supply or plumbing system in a structure or where, in the judgment of the Municipal Water Department, an actual or potential hazard to the public potable water system exists.
(2) An approved air gap separation or reduced pressure principal backflow prevention device shall be installed at the service connection or within any premises where, in the judgment of the Municipal Water Department, the nature and extent of activities, or material stored on the premises, would prevent an immediate and dangerous hazard to health should a cross-connection occur, even though such cross-connection may not exist at the time the backflow prevention device is required to be installed. This includes but is not limited to the following situations:
(a) Premises having an auxiliary water supply, unless the quality of the auxiliary supply is acceptable to the Municipal Water Department;
(b) Premises having internal cross-connections that are not correctable, or intricate plumbing arrangements which make it impractical to ascertain whether or not cross-connections exist;
(c) Premises where entry is restricted so that inspections for cross-connections cannot be made with sufficient frequency or at sufficiently short notice to assure the cross-connections do not exist;
(d) Premises that although not covered by code are subject to frequent modification which would change their status, or premises that have had backflow code violations;
(e) Premises on which any substance is handled under pressure so as to permit entry into the public water supply, or where a cross-connection could reasonably be expected to occur. This shall include the handling of process waters and cooling waters; or
(f) Premises where materials of a toxic or hazardous nature are handled such that if backsiphonage or backpressure should occur, a serious health hazard may result.
(Prior Code, § 3-128)