N.H. Rev. Stat. Ann. § 486:12

If the commissioner determines, following public hearing, that any industrial user of a treatment works subject to this chapter has failed, in whole or in part, to reimburse the owner of the treatment works as provided in this chapter, and that the owner either has failed to take available legal recourse to compel compliance, or is incapable of doing so, then the commissioner may request the attorney general to institute appropriate legal action against such user in the name of the state and the owner of the treatment works.