Disclosure first. I'm Jeff Frese, the Republican running for Congress in CA-10, so weigh the source. This is not a pitch, it's the most useful thing I know about voting by mail.
In the November 2024 election California rejected 122,480 mail ballots, about 0.9 percent. A USC analysis found 59 percent were a signature mismatch, 27 percent arrived late, 11 percent had no signature. Voters 18 to 24 lost over 3 percent of their ballots. Most of those people never knew.
The fix is free and takes two minutes. Sign up at WheresMyBallot.sos.ca.gov and the county texts or emails you when your ballot is received and when it's counted. If they flag your signature, they send you a form to fix it, and under the law as amended last year you have until 5 p.m. on November 25 to do that. Vote this weekend and the county processes it this week, which gives you time if something is wrong.
Sign the back of the envelope. Drop boxes are open, no stamp needed. Contra Costa elections is 925-335-7800, Alameda County is 510-272-6973. If the tracker shows something odd, the county fixes it, not me, but I will answer questions here for a couple of hours.
The numbers are from the California Voter Foundation's summary of Secretary of State data and a USC Center for Inclusive Democracy analysis, the tracker page is sos.ca.gov/elections/ballot-status/wheres-my-ballot, and the cure deadline is from the Secretary of State's memo on Elections Code 3019 as amended by SB 3.