The purpose of this article is as follows:
A.
To protect the public water supply from contamination or pollution by isolating, within the property owner's water system, contaminates or pollutants which could backflow through the service connection into the public water system.
B.
To promote the elimination or control of existing cross-connections, actual or potential, between public and outside water supplies and nonpotable water system, plumbing fixtures and sources or systems containing process fluids.
C.
To provide for the maintenance and continuation of a cross-connection and backflow control program which will prevent the contamination or pollution of the public water supply.