Whenever the board of supervisors of a county makes provision by ordinance for the issuance of marriage licenses outside of the normal business hours, the board may establish a fee, in addition to that provided in Section 26840, not to exceed five dollars ($5), which shall be paid to the county treasury.
Source:
Section 26840.2, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV§ionNum=26840.2..