no backflow preventer required???

[syarn]

5,380 sf developer retail shell. the shell upfit drawings show two single user bathrooms (1 lav, 1 gravity flush toilet) plus 1 mop sink & 1 tank hot water heater.

is a backflow preventer required by code right after the water meter?

 

[JLSeagull]

Look into the building codes for the requirements. Individual fixtures such as toilets likely require backflow preventers or air gaps. Design the potable water supply system in a manner that prevents contamination from non-potable liquids, solids or gases being introduced into the potable water supply through cross-connections or any other piping connections to the system. Install backflow preventers in accessible locations suitable for inspection and testing. I don't know about the requirements at the supply but it sounds reasonable.