California law mandates that all active registered voters receive a ballot by mail for every election, a policy established by the Voter’s Choice Act and expanded statewide during the COVID-19 pandemic. According to the California Secretary of State’s office, election officials maintain voter rolls through the Statewide Voter Registration Database, which is updated regularly using data from the Department of Motor Vehicles, the Department of Public Health, and the U.S. Postal Service’s National Change of Address program to remove ineligible individuals.
How California Maintains Voter Roll Accuracy
California election officials employ several automated and manual processes to ensure that ballots are only sent to eligible voters. Under the National Voter Registration Act, states must conduct a general program that makes a reasonable effort to remove the names of ineligible voters from the official lists by reason of death or change of residence.

In California, the Secretary of State coordinates with the Electronic Registration Information Center (ERIC) and other data-sharing agreements to identify voters who have moved out of state or passed away. Once an official notice of death or a confirmed change of address is processed, the voter’s record is updated to "inactive" or cancelled status, preventing a ballot from being mailed to that address.
The Process for Mailing Ballots
County elections officials are responsible for the physical distribution of ballots. According to the California Elections Code, ballots must be mailed no later than 29 days before an election.
- Verification: Before a ballot is mailed, the voter’s registration status must be "active."
- Tracking: Voters can track their ballot status through the state’s BallotTrax system, which provides notifications regarding when a ballot is mailed, received, and counted.
- Signature Matching: Once a ballot is returned, election officials compare the signature on the envelope to the signature in the voter’s registration record to verify identity.
Comparison of Voting Systems
While California utilizes a universal mail-in ballot system, other states maintain different requirements. The following table highlights the primary differences in ballot distribution policies:

| State | Ballot Distribution Policy | Verification Requirement |
|---|---|---|
| California | Mailed to all active registered voters | Signature verification on envelope |
| Texas | Mailed only upon request | ID number or partial SSN required |
| Florida | Mailed only upon request | Signature verification |
Why Voter List Maintenance Matters
The integrity of the mail-in voting system relies heavily on the accuracy of the underlying registration database. Critics of universal mail-in voting often point to the potential for ballots to be sent to outdated addresses. However, state officials maintain that the use of U.S. Postal Service non-forwarding protocols prevents ballots from reaching unauthorized parties. If a ballot is undeliverable, the post office returns it to the county elections office, which then triggers a review of the voter’s registration status.
State law also provides for a "curing" process. If a signature is missing or does not match the file on record, the county elections official must contact the voter to provide them an opportunity to correct the issue before the final certification of the election results.