California Code, Water Code - WAT § 2702

(a) The board may order a reconsideration of all or part of an order of determination on the board's own motion or on petition of any party affected by the order. The petition shall be filed within 30 days after the notice required by Section 2701 is sent. The authority of the board to order a reconsideration on its own motion shall expire 30 days after the board has adopted the order. The board shall order or deny reconsideration on a petition for reconsideration within 90 days after the notice required by Section 2701 is sent.

(b) The order of determination may be reconsidered by the board on all the pertinent parts of the record and any arguments as may be permitted, or a further hearing may be held, upon notice to all affected parties, for the purpose of receiving additional evidence that the board may, for cause, allow. The order on reconsideration has the same force and effect as an original order.