(A) Whenever a system of water supply piping, either inside or outside of any building, receives its supply from any source other than the waterworks system of the village, such system shall be kept entirely separate from and no cross-connections or connections of any kind shall be made with any pipe or system of piping which receives its supply from the village waterworks system.
(B) Water which has once been used for any purpose whatsoever shall not be returned to the building’s water supply system.