Cal. Pub. Res. Code § 41787
(a)
(1) The board may reduce the diversion requirements of Section 41780 for a rural city if the rural city demonstrates, and the board concurs, based on substantial evidence in the record, that achievement of the diversion requirements is not feasible due to both of the following conditions:
(2) The board may reduce the diversion requirements of Section 41780 for the unincorporated area of a rural county if the rural county demonstrates, and the board concurs, based on substantial evidence in the record, that achievement of the diversion requirements is not feasible due to both of the following conditions:
(3) The board may grant a reduction in diversion requirements pursuant to this subdivision only if the rural city or the rural county demonstrates to the board, and the board concurs, based on substantial evidence in the record, that it has, at a minimum, implemented all of the following programs: