California Code, Water Code - WAT § 1105

(a) Except as provided in subdivision (c), no person shall be excused from testifying or from producing any evidence in any investigation or inquiry by or hearing before the board upon the ground that the testimony or evidence required of him or her may tend to incriminate him or her or subject him or her to any penalty.

(b) The board may grant immunity to any person who is compelled to testify or to produce documentary evidence before the board and who invokes the privilege against self-incrimination.

(c) If the board does not grant immunity after a person invokes the privilege against self-incrimination, the board shall excuse the person from giving any testimony or producing any evidence to which the privilege against self-incrimination applies, and the board shall dismiss, continue, or limit the scope of the proceedings as necessary to ensure that the unavailability of the testimony or evidence does not deny due process of law to any party.