No water service connection to any premises shall be installed or continued in use by the purveyor unless the water supply is protected by backflow prevention devices as may be required by this Chapter. The installation or maintenance of a cross-connection which will endanger the water quality of the potable water supply of the City shall be unlawful and is prohibited. Any such cross-connection now existing or hereafter installed is hereby declared to be a public nuisance and the same shall be abated. The control or elimination of cross-connections shall be in accordance with this Chapter, together with the latest addition of appropriate manuals of standard practice pertaining to cross-connection control approved by the Idaho State Department of Health. The Building Official shall have the authority to establish requirements more stringent than State regulations if he deems that the conditions so dictate. The purveyor shall adopt rules and regulations as necessary to carry out the provisions of this Chapter.