A. Industrial, commercial and warehouse buildings;

B. Premises having an auxiliary water supply;

C. Premises having internal cross-connections that are not correctable, or intricate plumbing arrangements which make it impractical to ascertain whether or not a cross-connection exists;

D. Premises where entry is restricted so that inspections for cross-connections cannot be made with sufficient frequency, or at sufficiently short notice, to assure that cross-connections do not exist;

E. Premises having a repeated history of cross-connections being established, or reestablished;

F. 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 water and cooling waters;

G. Premises where material of toxic or hazardous nature is handled such that if backsiphonage should occur, a serious health hazard may result;

H. The following types of facilities will fall into one of the above categories where an approved backflow preventer shall be installed at these facilities as set forth in this section: