California Code, Health and Safety Code - HSC § 2874

The board of supervisors, from time to time, may order a temporary transfer of money from other available funds in the county treasury to the credit of the district fund.  The transfer shall be made only upon resolution adopted by the board of supervisors directing the treasurer to make the transfer.  It shall not exceed eighty-five per cent of the taxes accruing to the district, and shall not be made prior to the first day of the fiscal year nor after the last Monday in April of the current fiscal year.  Any funds transferred shall be replaced from the taxes accruing to the district before any other obligation of the district is met from those taxes.