Cal. Gov. Code § 51294.1
After 30 days have elapsed following its action, pursuant to subdivision (b) of Section 51291, advising the local governing body of a county or city administering an agricultural preserve of its intention to consider the location of a public improvement within such agricultural preserve, a public agency proposing to acquire land within an agricultural preserve for water transmission facilities which will extend into more than one county, may file the proposed route of the facilities with each county or city administering an agricultural preserve into which the facilities will extend and request each county or city to approve or agree to the location of the facilities or the acquisition of the land therefor. Upon approval or agreement, the provisions of Section 51292 shall not apply to the location of the proposed water transmission facility or the acquisition of land therefor in any county or city which has approved or agreed to the location or acquisition.
Ca. Gov. Code § 51294.1