Members of the regional board shall be empowered to administer oaths and issue subpoenas for the attendance and giving of testimony by witnesses and for the production of evidence in any proceeding before the board in any part of the region. The provisions of Chapter 3 (commencing with Section 1075) of Part I of Division 2 of this code shall apply to regional boards within their own regions, where they shall have the same power as the state board within the state.