(A) A backflow or backsiphonage prevention device approved by the Water Commissioner shall be installed, by a plumber, at the customer’s expense in the customer service pipe when any of the following conditions are found by the Water Commissioner:
(1) Premises having an auxiliary water supply;
(2) Premises on which, in the opinion of the Water Commissioner, substances are handled in a manner as to create an actual or potential hazard to the public water supply;
(3) Premises having existing or potential internal cross-connection;
(4) Premises where, in the opinion of the Water Commissioner, it is impossible or impractical to make a complete cross-connection premises survey; and
(5) Premises having more than one customer service pipe.
(B) No backflow or backsiphonage prevention device shall be approved by the Water Commissioner until the device has been approved by the American Society of Sanitary Engineers, the American Waterworks Association or the University of Southern California Testing Laboratories.
(1999 Code, § 3-125) Penalty, see § 52.99