Neb. Rev. Stat. § 76-2607

(a) A copy of an environmental covenant shall be provided by the persons and in the manner required by the agency to: (1) Each person that signed the covenant; (2) Each person holding a recorded interest in the real property subject to the covenant; (3) Each person in possession of the real property subject to the covenant; (4) Each municipality or other unit of local government in which real property subject to the covenant is located; and (5) Any other person the agency requires. (b) The validity of a covenant is not affected by failure to provide a copy of the covenant as required under this section.