Cal. Water Code § 43003.5

Upon adoption of rules and regulations, or the adoption of any amendment thereto, a certified copy thereof shall be recorded with the county recorder of each affected county, and until so recorded, no rule or regulation, or amendment thereto, shall be enforceable against any person not having actual knowledge thereof. A copy of the adopted rules and regulations in effect in the district shall be maintained on file and open for inspection at the district office by the district secretary.