Water Code § 8880
CHAPTER 6. Sale of Land for Delinquent Assessments
If no redemption is made within one year the board, upon demand and the surrender of the certificate of purchase and the delivery of a certificate of the county treasurer that no redemption has been made within the year from date of sale, shall execute to the purchaser, his heirs or assigns, a deed of conveyance of the parcel of land described in the certificate.