(A) Each service connection from the village water supply for furnishing water to premises having an auxiliary water supply shall be protected against backflow of water from the premises into the village water supply, unless the auxiliary water supply is an approved water supply or is accepted as an additional source by the Director of Public Works.
(B) If the auxiliary water supply is not an approved water supply or if it is not accepted as an additional source and approved in the manner specified in division (A) above, and the auxiliary water supply is handled in a separate piping system with no known cross connection, the village water supply shall be protected by an approved double check valve assembly installed at the service connection to the premises. When the auxiliary water supply may be contaminated, the Director may order the village water supply protected by an air gap separation or an approved reduced pressure principle backflow prevention device installed at the service connection.
(C) If the auxiliary water supply is not an approved water supply or if it is not accepted as an additional source and approved in the manner specified in division (A) above, and cross connections are known to exist between the village water supply and the auxiliary water supply which cannot presently be eliminated, the village water supply shall be protected by an approved reduced pressure principle backflow prevention device installed at the service connection to the premises. A double check valve assembly may be used in lieu of such device if the experience of the Director indicates that double check valves are reliably operated, and if approved by the Director.
(D) When the auxiliary water supply may be contaminated, the Director may order the village water supply protected by an air gap separation installed at the service connection.
(Ord. 1015-87, passed 9-2-87)