Cal. Health & Safety Code § 116985

No person shall allow any water closet, privy, cesspool, or septic tank, or carcass of any dead animal, or any offal of any kind, to remain in or upon the borders of any stream, pond, lake, or reservoir within the boundaries of any land owned or occupied by him or her, in a manner that the drainage from the water closet, privy, cesspool or septic tank, or carcass, or offal, may be taken up by or in the stream, pond, lake, or reservoir, if water is drawn therefrom for the supply of any portion of the inhabitants of this state.