The commissioners shall serve without salary until the yearly gross income of the district, exclusive of taxes levied by the district, exceeds twenty thousand dollars ($20,000) per year, when the board may, by ordinance, fix their salaries, which shall not exceed the sum of six hundred dollars ($600) per month each.
In addition to any salary received pursuant to this section, the commissioners shall be allowed any actual and necessary expenses incurred in the performance of their duties. Reimbursement for these expenses is subject to Sections 53232.2 and 53232.3 of the Government Code.