Cal. Health & Safety Code § 6961

At the time and place fixed in the resolution of intention or the petition, or at any time or place to which the hearing is adjourned, any interested person may appear and present any matters material to the questions set forth in the resolution of intention or the petition. At the hearing the board shall also hear the reports of any local health officer, and any public agency with statutory responsibilities for setting water quality standards, regarding any matters material to the questions set forth in the resolution of intention or the petition.