California Code, Health and Safety Code - HSC § 9031

(a) The board of trustees may provide, by ordinance or resolution, that each of its members may receive compensation in an amount not to exceed one hundred dollars ($100) for attending each meeting of the board.  A member of the board of trustees shall not receive compensation for more than six meetings of the board in a calendar month.  Commencing January 1, 2019, if the district compensates its members for more than four meetings in a calendar month, the board of trustees shall annually adopt a written policy describing, based on a finding supported by substantial evidence, why more than four meetings per calendar month are necessary for the effective operation of the district.

(b) The board of trustees, by ordinance adopted pursuant to Chapter 2 (commencing with Section 20200) of Division 10 of the Water Code, may increase the amount of compensation received for attending meetings of the board.

(c) In addition, members of the board of trustees may receive their actual and necessary traveling and incidental expenses incurred while on official business other than a meeting of the board.

(d) A member of the board of trustees may waive any or all of the payments permitted by this section.

(e) For the purposes of this section, a meeting of the board of trustees includes, but is not limited to, regular meetings, special meetings, closed sessions, emergency meetings, board field trips, district public hearings, or meetings of a committee of the board.

(f) For purposes of this section, the determination of whether a trustee's activities on any specific day are compensable shall be made pursuant to Article 2.3 (commencing with Section 53232) of Chapter 2 of Part 1 of Division 2 of Title 5 of the Government Code.

(g) Reimbursement for these expenses is subject to Sections 53232.2 and 53232.3 of the Government Code.