CA Food & Agric Code Section 11482

A refund may be made in whole or in part in any of the following instances:

(a)

A refund of a fee is requested by the payer before any examination, review, inspection, or similar activity has been performed or services rendered by the department for the payer.

(b)

The payment of a fee, assessment, or tax represents an overpayment, payment in duplicate, payment in error in law, or payment through error of the payer or the department.