Cal. Gov. Code § 25714
Every public agency which is involved in supplying or distributing water for residential, commercial, industrial or other purposes within the county and every public agency owning or operating water pollution control facilities within the county shall cooperate with the county in the preparation of the comprehensive water resources management plan. Each such agency shall furnish, at the request of the county, any data or information which may be useful or necessary to the preparation of such plan. Any expense incurred in furnishing such information shall be a proper charge against the county. During the preparation of the comprehensive water resources management plan the board of supervisors shall consult with and obtain the advice of the Peninsula Water Agency and all other organizations concerned with beneficial uses of water, as specified by subdivision (f) of Section 13050 of the Water Code, on all aspects of such plan.
Ca. Gov. Code § 25714