California Code, Penal Code - PEN § 347

(a)(1) Every person who willfully mingles any poison or harmful substance with any food, drink, medicine, or pharmaceutical product or who willfully places any poison or harmful substance in any spring, well, reservoir, or public water supply, where the person knows or should have known that the same would be taken by any human being to his or her injury, is guilty of a felony punishable by imprisonment in the state prison for two, four, or five years.

(2) Any violation of paragraph (1) involving the use of a poison or harmful substance that may cause death if ingested or that causes the infliction of great bodily injury on any person shall be punished by an additional term of three years.