Cal. Health & Safety Code § 40227

(a) Each member of the bay district board is entitled to reimbursement for actual and necessary expenses incurred in the performance of board duties.
(b) Each member of the bay district board may receive compensation, to be determined by the bay district board subject to subdivision (c), for any of the following:
1. (1) Attending a meeting of the bay district board or a committee of the bay district board.
2. (2) Attending a meeting, upon authorization of the bay district board, or a committee of the bay district board with delegated authority to provide authorization on behalf of the bay district board, while on official business of the bay district.
3. (3) Active transportation travel to a meeting described in paragraph (1) or (2).
(c)
1. (1) The compensation provided for attending meetings pursuant to paragraph (1) or (2) of subdivision (b) shall not exceed two hundred dollars ($200) per day and shall not exceed two thousand dollars ($2,000) per month.
2. (2) The compensation provided for active transportation travel pursuant to paragraph (3) of subdivision (b) may be calculated on a per mile basis or at a fixed daily, weekly, monthly, or annual rate, and may consider benefits to using active transportation travel, including, but not limited to, reduced traffic, improved health outcomes, and reduced air pollution.
3. (3) The compensation provided pursuant to subdivision (b) shall not exceed twenty-four thousand dollars ($24,000) in any one year.
4. (4) The compensation of each member of the bay district board may be increased above the amounts provided in this section by the bay district board at an open regular meeting, but the amount of the increase shall not exceed the greater of either of the following:
  1. (A) An amount equal to 5 percent for each year that has passed since the operative date of the last adjustment of the compensation.
  2. (B) Beginning January 1, 2025, an amount not to exceed 10 percent for each calendar year that is equal to the annual change in inflation as determined by the California Consumer Price Index.
5. (5) The bay district board or any ordinance shall not provide for automatic future increases in compensation for its members.
(d) Compensation pursuant to this section shall be fixed by ordinance. Any change to this ordinance shall be adopted at an open regular meeting of the bay district board.
(e) For the purposes of this section, “active transportation travel” means walking, bicycling, and other forms of transportation that the bay district board has found reduce traffic, improve health outcomes, and reduce air pollution.