California Code, Public Utilities Code - PUC § 13571

Without limiting in any way the provisions of this division, and in addition to the powers granted therein, the board may make and enforce such regulations for the control of quantity, quality and flow of waste water within the boundaries of a special district as are not in conflict with the general laws of the state.  “Waste water” shall include all sewage, industrial and other wastes and waters, whether treated or untreated, discharged into or permitted to enter a community sewer system connected to or directly into a district interceptor for treatment in sewage disposal facilities of a special district.