Within 30 days after such a petition has been filed with the State Natural Resources Conservation Council, it shall cause due notice to be given of a proposed hearing upon such petition as to the necessity, in the interest of the public health, safety, and welfare, for the creation of such district, and upon all questions relevant to such petition. All owners of land within the limits of the territory described in the petition and all other interested parties shall have the right to attend such hearings and to be heard. If it shall appear upon the hearing that it may be desirable to include within the proposed district territory outside of the area within which due notice of the hearing has been given, the hearing shall be adjourned and due notice of further hearing shall be given throughout the entire area considered for inclusion in the district and such further hearing held. (Amended 1959, No. 329 (Adj. Sess.), § 11(c), eff. March 1, 1961; 1967, No. 303 (Adj. Sess.), § 16(b), eff. March 22, 1968.)