No service connections shall be allowed from the City mains to any premises supplied with water from any other sources, unless it be shown that the City will receive reasonable return on its investment and then only on special permission, in writing, by the Public Works Director, which permission shall be revocable at any time. No connection, temporary or permanent, shall be permitted between the City water supply system and any other source of water supply whatsoever. (Ord. 632, 7-28-1993)