Cal. Water Code § 60622

(a) All contracts and other documents executed by the district that require or authorize the district to expend ten thousand dollars ($10,000) or more shall be authorized by the board of directors and signed by the president and the secretary except that the board may, by resolution for a specific expenditure, authorize the district manager or other district representative to sign contracts and other documents in the name of the district, not to exceed twenty-five thousand dollars ($25,000).

(b) All contracts and other documents executed by the district that require or authorize the district to expend less than ten thousand dollars ($10,000) may be approved and signed by the district manager or other district representative authorized by the board of directors, provided, however, that the manager may not execute multiple contracts or documents on behalf of the district with the same person or entity within a one-year period that cumulatively total ten thousand dollars ($10,000) or more, without the board’s prior approval.