Cross-connection

means any actual or potential connection between a water supply and any contaminant .

any connection or arrangement, physical or otherwise, between any potable water supply system either directly or indirectly connected to a water main, and any fixture, storage tank, receptacle, equipment or device through which it may be possible for any non-potable, used, unclean, polluted or contaminated water, or any other substance, to enter any part of such potable water system under any conditions

<water supply> connection or arrangement, physical or otherwise, between any potable water supply system either directly or indirectly connected to a water main, and any fixture, storage tank, receptacle, equipment or device through which it may be possible for any non-potable, used, unclean, polluted or contaminated water, or any other substance, to enter any part of such potable water system under any conditions