Cal. WAT § 175

(a) There is in the California Environmental Protection Agency the State Water Resources Control Board consisting of five members appointed by the Governor. One of the members appointed shall be an attorney admitted to practice law in this state who is qualified in the fields of water supply and water rights, one shall be a registered civil engineer under the laws of this state who is qualified in the fields of water supply and water rights, one shall be a registered professional engineer under the laws of this state who is experienced in sanitary engineering and who is qualified in the field of water quality, and one shall be qualified in the field of water quality. One of the above-appointed persons, in addition to having the specified qualifications, shall be qualified in the field of water supply and water quality relating to irrigated agriculture. One member shall not be required to have specialized experience.

(b) Each member shall represent the state at large and not any particular portion thereof and shall serve full time. The board shall, to the extent possible, be composed of members from different regions of the state. The appointments made by the Governor shall be subject to confirmation by the Senate in accordance with Article 2 (commencing with Section 1770) of Chapter 4 of Division 4 of Title 1 of the Government Code.