California Elections Code
(a) A county elections official shall establish a free access system that allows a vote by mail voter to learn if his or her vote by mail ballot was counted and, if not, the reason why the ballot was not counted. For each election, the elections official shall make the free access system available to a vote by mail voter upon completion of the official canvass and for 30 days after completion of the official canvas.
(b) For purposes of establishing the free access system for vote by mail ballots required by subdivision (a), a county elections official may use the free access system for provisional ballots established by the county pursuant to Section 302 of the federal Help America Vote Act of 2002 (52 U.S.C. Sec. 21082).
(c) If a county elections official elects not to mail a sample ballot to a voter pursuant to Section 13305, the elections official shall use any savings achieved to offset the costs associated with establishing the free access system for vote by mail ballots required by subdivision (a).