Water Code § 41018
CHAPTER 1. Voters and Qualifications
If there is included in any assessment roll or list furnished to an election board any land which has no valuation assigned to it, the department or the board, as the case may be, shall request the county assessor to value the land and the county assessor shall prepare and furnish to the department or board requesting it a statement of the value of the land as appraised by him.