Water Code § 8889
CHAPTER 6. Sale of Land for Delinquent Assessments
When any lands purchased at the delinquent sale by the drainage district remain unsold then the board shall sell all such lands so held by the drainage district at public auction to the highest bidder for cash, upon two weeks published notice substantially in the manner provided for notice upon delinquent sales, and shall execute to the purchaser a conveyance, which deed shall convey title to the land as prescribed in this chapter.