N.H. Rev. Stat. § 541-A:24
The validity or applicability of a rule may be determined in an action for declaratory judgment in the Merrimack county superior court if it is alleged that the rule, or its threatened application, interferes with or impairs, or threatens to interfere with or impair, the legal rights or privileges of the plaintiff. The agency shall be made a party to the action. The plaintiff shall give notice of the action to the office of legislative services, division of administrative rules, at the time of filing. A declaratory judgment may be rendered whether or not the plaintiff has requested the agency to pass upon the validity or applicability of the rule in question. Upon receiving a declaratory judgment, the respondent agency or department shall also file a copy of that judgment with the office of legislative services, division of administrative rules.
RSA 541-A:24
1994, 412:1, eff. Aug. 9, 1994. 2017, 101 : 3 , eff. Aug. 7, 2017.