Mop Sink

[AZ Contractor]

Is there anything in the plumbing code that states that there is supposed to be an extra cold water supply at a mop sink for chemicals?

[Gary Swart]

Let's let HJ answer this one, he's in Arizona and is a real pro. All I can say is it would hurt to have it, but required, I don't have a clue.

[AZ Contractor]

We've put them in every restaurant I built and now I have this one plumber that says its not code and not on the plans. If I want it, I pay extra.

[markts30]

A separate water supply is not required by code but any supply that is hooked up to a chemical dispenser will have to be protected by a backflow preventer...
(the vacuume breaker on the sink's faucet does not count - we have to use a separate RPZ unit...)