Cal. Elec. Code § 15281

The precinct board shall sign and post conspicuously on the outside of the polling place a copy of the result of the votes cast. The copy shall remain posted for at least 48 hours after the official time fixed for the closing of the polls. To protect a person’s right to cast a secret ballot under Section 7 of Article II of the California Constitution, in cases where fewer than 10 voters cast ballots and the precinct board tallies the results at the precinct, the precinct board shall post only the total number of people who voted at the precinct.