Cal. Pub. Util. Code § 90242

The board shall establish rules for its proceedings and may provide by ordinance or resolution that each member shall receive for each attendance at the meetings of the board and for each day any member is engaged in authorized district business other than attendance at meetings of the board the sum of fifty dollars ($50) but not to exceed two hundred dollars ($200) in any calendar month and shall be allowed such necessary traveling and personal expenses incurred in the performance of his duties as authorized by the board.