CA Health & Safety Code Section 114192

(a)

Except as provided in subdivision (d), an adequate, protected, pressurized, potable supply of hot water and cold water shall be provided. Hot water shall be supplied at a minimum temperature of at least 120ºF measured from the faucet, unless otherwise specified in this part. The water supply shall be from a water system approved by the health officer or the local enforcement agency.

(b)

Any hose used for conveying potable water shall be constructed of nontoxic materials, shall be used for no other purpose, and shall be clearly labeled as to its use. The hose shall be stored and used so as to be kept free of contamination.

(c)

The potable water supply shall be protected with a backflow or back siphonage protection device when required by applicable plumbing codes. Exposed piping of a nonpotable water system shall be identified so that it is readily distinguishable from piping that carries potable water.

(d)

A food facility may provide only warm water if the water supply is used only for handwashing, as required in Section 113953.