The text
(a)
"Cross connections" means any actual or potential connection, arrangement or installation of piping, structures or devices whereby it is possible for any used, unclean, polluted or contaminated water, mixture, gas or substance to enter any portion of any approved water supply.
(b)
"Approved water supply" means a potable water supply of safe, sanitary quality which is approved for human consumption by the authorities having jurisdiction thereof.
(c)
"Used water" means any water supplied to a customer's water system after it has passed through the point of delivery and is no longer under control of the city.
(d)
Water service may be discontinued to any premises upon which there is found to be another source of water supply or a possible cross connection. Such service shall not be restored until such cross connection has been eliminated or back-flow devices satisfactory to the city have been installed. The expense and maintenance of back-flow devices and the cost of eliminating cross connections shall be paid by the consumer or owner of the premises.
(Ord. 246 §1(part), 1977).