N.H. Rev. Stat. Ann. § 485:30

No person, association or corporation shall cause or permit the discharge of sewage or other deleterious waste from any dwelling, camp, factory, hotel, boardinghouse, or other commercial establishment into any stream, lake, pond, or river not previously polluted, without first submitting detailed plans of said proposed discharge to the department and securing the approval of the said department. Any person who violates the provisions of this section shall be guilty of a misdemeanor if a natural person, or guilty of a felony if any other person.