Overpayment of the required fee received in the office of the State Registrar shall be retained, except any overpayment shall be refunded upon written request of the applicant within one year or when overpayment is in excess of two dollars ($2).
Source:
Section 103635, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=103635..