California Code, Public Resources Code - PRC § 29427

(a) Prior to certification of the county's component of the local protection program, the county shall designate the area of the county adjacent to the marsh that should be retained in agricultural use, or in uses that are compatible with agricultural use, in order to ensure the long-term agricultural use and productivity of agricultural lands within the marsh.

(b) Within such area the county shall do all of the following prior to certification of the county's component: (1) determine the minimum size parcels necessary for long-term agricultural use and productivity, (2) establish enforceable standards limiting or prohibiting land divisions or other types of development that are inconsistent with protection of the marsh and continued agricultural use, (3) establish enforceable standards precluding agricultural uses by type and intensity that are inconsistent with the long-term preservation of the marsh, and (4) limit special assessments against agricultural lands for the provision of public services, the demand for which is not generated by agricultural uses on such lands.

(c) No change by the county of any designation, standard, or limitation established pursuant to this section shall become effective until 30 days after it has notified the commission of the proposed change and unless it makes a specific finding that the change will not adversely affect, directly or indirectly, the long-term agricultural use and productivity of agricultural lands within the marsh.