not required and not enforced aren't the same thing. The backflow device installed at the meter is typically an untestable dual spring check, though i'm not sure what gets installed in your area. NHMaster is correct that the local amendments can't trump the ICC, the can't be made less stringent.
but again, enforcement is going to dictate how a lot of things are done.
Then you might get a mouthful of that 2000 Flushes Blue. :eek:
More stringent applies. An area cannot degrade the basic code. If they do, it's only a matter of time before they get in trouble and installers will too.
The notion of "I was doing what I was told..." will not hold up when one knows better. It didn't work at Nuremberg either.
Lets look at this logically. Start with "does a boiler drain on a water heater require a backflow preventer?" A water heater drain is not considered to be a normal supply connection and though it is possible to do exactly what you have said, the code does not preclude all forms of stupidity, same goes for a washer connection because it is assumed that anyone connecting to it would have to first disconnect the hoses. As for considering a BFP at the meter to be sufficient protection, the BFP will indeed protect the supply but it will not protect the residence. I really really hate to do this again but you are going to need to point to where you are getting these rules from. Remember though that I have a copy of both your state code ( 03 IPC ) and your cities amendments and I've read them both. You make it sound like you live in a 3rd world country down there.
Now I said backflow preventer...not vaccum breaker. So install whatever backflow device on the washing machine connections because my carpet cleaner friend uses them all the time and so do guys with pressure washers.
Apartments are vaccant some times and when its vaccant there are no washer and dryers in them....same with alot of houses. people fill their carpet cleanign machines with them and connect pressure washers to them to clean 3 and 4 floor patios.