California’s June 2026 primary election highlighted a persistent challenge facing the state’s mail-ballot system: nearly 150,000 ballots were rejected despite widespread efforts to ensure every vote is counted. The rejections underscore ongoing debates about California’s mail-in voting process and raise questions about whether the state is doing enough to help voters navigate technical requirements that can disqualify their ballots.
The state mailed ballots to all registered voters ahead of the June 2 election, a practice that has become standard in California. With the vast majority of voters casting ballots by mail, election officials face the herculean task of verifying and processing millions of ballots over weeks following Election Day. However, significant numbers of those ballots never reach the counting stage.
Signature mismatches and late arrivals represent the primary reasons ballots get rejected. When election officials scan mail ballots, they compare voter signatures on the envelopes to signatures on file with the state. If the signatures don’t match sufficiently, the ballot gets flagged for human review. Additionally, ballots that fail to arrive within seven days of Election Day cannot be counted, even if they were postmarked on time.
California has implemented a “curing” system designed to rescue ballots with signature problems. County election officials are required to contact voters within 24 hours of flagging a signature issue, providing them 21 days after Election Day to submit a corrected signature. Despite these protections, many voters never learn about problems with their ballots or fail to respond in time.
Election officials also operate the “Where’s My Ballot?” tracking tool, which notifies voters when their ballots are received and counted. The system alerts voters to signature problems, potentially allowing them to cure their ballots. However, not all voters are aware of the tool or use it consistently.
The state has invested resources to reduce rejections. California law now allows ballots postmarked on Election Day to arrive up to seven days later and still be counted, extending the deadline from the previous three-day window. Multiple counties employ different verification methods—some use automated scanning technology while others rely on manual human review by multiple officials. In some counties, three separate election officials must unanimously agree that a signature differs significantly before it can be rejected.
Despite these improvements, advocates for voter access argue that the system still leaves too many votes uncounted. Some voters report receiving notification of rejection days or weeks after the election, sometimes after candidates have already conceded races. Others struggle with the signature verification process, particularly voters with disabilities or those whose signatures naturally vary over time.
State election officials have acknowledged the challenge. Secretary of State Shirley N. Weber emphasized that California’s commitment is ensuring “every ballot is counted properly and every ballot is accounted for.” County elections officials have up to 30 days after Election Day to complete their ballot counting, verification, and certification work.
The 150,000 rejected ballots represent a significant portion of votes that attempted to reach the counting stage. While some may eventually be counted through the curing process, many voters will never know what happened to their ballots or understand the technical requirements they failed to meet.
Experts point to the inherent challenges of mail voting without in-person support. At polling places, election workers can assist voters with questions about their ballots. At home, voters have no such guidance and must follow instructions on their envelopes without assistance. Simple mistakes—signing with a different pen, writing instead of printing, or misaligning the signature line—can trigger rejection.
The issue has drawn criticism from election security advocates and voters alike. Some suggest the state needs to do more to educate voters about requirements before ballots are mailed. Others argue that counties should more aggressively contact voters about problems before they result in permanent ballot rejection.
California continues to wrestle with balancing accessibility and security in its mail-ballot system. As the 2026 primary ballot-counting process continues through July, officials are working to process millions of remaining ballots while dealing with the lingering reality that thousands of voters’ attempts to participate in the democratic process have gone uncounted.