It is unlawful to knowingly and willfully contaminate, adulterate, or otherwise impurify, or attempt to contaminate, adulterate or otherwise impurify, the water in a public water system, as defined in G.S. 130A-313(10), including the water source, with any toxic chemical, biological agent or radiological substance that is harmful to human health, except those added in approved concentrations for water treatment operations.
N.C. Gen. Stat. § 14-159.1