Permits may be issued (upon payment of a fee as may be set by the Council by resolution) for connection to the public water system for swimming pools, irrigation of yards, gardens, and other uses for which sanitary sewer service charges are not applicable. A backflow preventer to protect against contamination of the water system shall be installed in such connections on the hose bib. No underground irrigation systems shall be allowed in the public right-of-way or public lands.