Cal. Elec. Code § 2201
(a) The county elections official shall cancel the registration in the following cases:
(b) The Secretary of State may cancel the registration in the following cases:
(c)
(1) Between 15 and 30 days, inclusive, before canceling a person’s registration for the reasons specified in paragraph (2), (3), (5), or (6) of subdivision (a), the county elections official shall send a forwardable notice by first-class mail, including a postage-paid and preaddressed return form, to the voter.
(B) The notice shall include a statement substantially similar to the following:
“IMPORTANT NOTICE. Your voter registration record is scheduled to be canceled on [date]. This cancellation is due to information the [county name] County elections office has received indicating your ineligibility to vote in that county due to a change of residence, death, prison commitment or mental incapacity to vote pursuant to Sections 2208, 2209, 2210, or 2211 of the California Elections Code, as applicable.
If you believe this cancellation is in error, please notify our office within 15 days from the date of this notice either by returning the attached postage-paid postcard or by calling [county elections office phone number] toll free.
If we do not receive your response to this notice, you may be required to reregister to vote in the next election or to vote using a provisional ballot. You can find more information about voter eligibility rules on the Secretary of State’s internet website at [URL] or voter hotline at [phone numbers]. You can also check your current registration status at [URL].”
(2) The preaddressed return form described in paragraph (1) shall include all of the following: