California Code, Health and Safety Code - HSC § 6814

At that time the board of supervisors shall hear the petition.

The board of supervisors shall not modify the boundaries of the district as set forth in the petition so as to exclude from the district any land which would be benefited by the reorganization of the district under this part, nor shall any lands which will not in the judgment of the board of supervisors be benefited by the reorganized district be included within the district.