The local registrar of marriages shall transmit to the State Registrar not less than quarterly all original marriage certificates accepted for registration by him or her during the preceding quarter. Certificates shall be batched by calendar year of event prior to transmission. Certificates may be transmitted at more frequent intervals by arrangement with the State Registrar.
Source:
Section 102355, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=102355..