Cal. Water Code - WAT § 1100. Section 1100.
The board or any party to a proceeding before it may, in any investigation or hearing, cause the deposition of witnesses residing within or without the state to be taken in the manner prescribed by law for depositions in civil actions in the superior courts of this state under Title 4 (commencing with Section 2016.010) of Part 4 of the Code of Civil Procedure.