Cal. HSC § 114020

Frozen potentially hazardous food shall only be thawed in one of the following ways: (a) Under refrigeration that maintains the food temperature at 41°F or below. (b) Completely submerged under potable running water for a period not to exceed two hours at a water temperature of 70°F or below, and with sufficient water velocity to agitate and flush off loose particles into the sink drain. (c) In a microwave oven if immediately followed by immediate preparation. (d) As part of a cooking process.