A. An Approved Backflow Prevention Device shall be installed on each Service Line to a Consumer Water System serving his Premises where, in the judgment of the Water Purveyor, actual or potential hazards to the public potable water system exist.
B. An Approved Backflow Prevention Device or method shall be installed on each Service Line to a Consumer Water System serving properties where any of the following conditions exist:
1. Properties having, or having had, access to a second source of water;
2. Premises on which any substance is handled in such a fashion as to create an actual or potential hazard to the public potable water system. This shall include Premises having sources or systems containing Process Fluids or waters originating from the public potable water system, which are no longer under the sanitary control of the Water Purveyor;
3. Premises having internal Cross-Connections that, in the judgment of the Water Purveyor, are not correctable; or intricate plumbing arrangements which make it impractical to determine whether or not Cross-Connections exist;
4. Premises where, because of security requirements or other prohibitions or restrictions, it is impossible or impractical to make a complete Cross-Connection survey;
5. Premises having a repeated history of Cross-Connections being established or reestablished;
6. Others specified by the Director.