California Code, Elections Code - ELEC § 2224

(a) If a voter has not voted in an election within the preceding four years, and the voter's residence address, name, or party preference has not been updated during that time, the county elections official may send an alternate residency confirmation postcard. The use of this postcard may be sent subsequent to NCOA or county voter information guide returns, but shall not be used in the residency confirmation process conducted under Section 2220. The postcard shall be forwardable, including a postage-paid and preaddressed return form to enable the voter to verify or correct the address information, and shall be in substantially the following form:

“If the person named on the postcard is not at this address, PLEASE help keep the voter rolls current and save taxpayer dollars by returning this postcard to your mail carrier.”

“IMPORTANT NOTICE”

“According to our records you have not voted in any election during the past four years, which may indicate that you no longer reside in ____ County. If you continue to reside in California you must confirm your residency address in order to remain on the active voter list and receive election materials in the mail.”

“If confirmation has not been received within 15 days, you may be required to provide proof of your residence address in order to vote at future elections.”

(b) The use of a toll-free number to confirm the old residence address is optional. A change to a voter's address shall be received in writing.

(c) A county using the alternate residency confirmation procedure shall notify all voters of the procedure in the county voter information guide or in a separate mailing.

(d) This section shall become inoperative on January 1, 2020, and, as of January 1, 2029, is repealed.