Cal. Water Code § 74431

Before any change of the boundaries of the divisions is made pursuant to Section 74430, the board shall give notice of its intention to do so. Such notice shall specify, in a general way, the changes which the board proposes to make and a time and place for a hearing at which any owner of land in the district may appear before the board and object to the making of the proposed change or changes or petition that a change be made otherwise than as proposed.