Regarding Arney's observation on the siphoning issue...many municipalities have requirements for backflow preventors to be installed on water lines to larger buildings.

Typically this is with multistory buildings and prevents the water from returning back to the municipal systems if/when they have low pressure events on the municipal mains lines. I've also seen these required when people install a separate irrigation water meter for residences and businesses.

In south Florida, these backflow devices are required to be inspected on an annual basis. Depending upon the chemicals in the water, the valves can have a limited lifetime. At work the eight inch main potable water and fire line back flows have been rebuilt twice in about fifteen years.

Regards,
Comanche7