CA Health & Safety Code Section 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.