Any existing backflow prevention assemblies are to be approved to continue service
unless a higher degree of protection is required. In premises where the hazard has
increased, as in the case of a change of occupancy, any existing backflow prevention
assembly(s) shall be upgraded to comply with this article, or in the event that no
assemblies are present, any premises where the building code division has determined
that a real or potential health hazard or system hazard exists shall be brought into
compliance with this article. Any existing backflow prevention assemblies that are
not on the current list of approved backflow prevention assemblies may be approved
to continue in service provided that the assemblies can be maintained, tested and
that repair parts are available through the manufacturer. Whenever obsolete assemblies
are replaced, they shall be replaced with current approved backflow prevention assemblies.
