On premises where water is supplied from two (2) sources, the City water being one of them, the piping system for City water must be entirely separated from that of the other source. If other than City water is to be furnished premises previously supplied with City water, the owner or his plumber must give notice at the office of the Water and Sewer Department when he will make this change and must also cut off the City water at the corporation cock and disconnect the service pipe.
Premises now having direct connection between the City water supply and another supply shall forthwith disconnect the same. (1994 Code)