Resolutions shall first be passed by the legislative bodies of half or more, but of not less than two, of the public agencies, all or any part of the area of which it is intended to include in the proposed special district, declaring that the public interest or necessity demands the creation of a special district for sewage disposal or solid waste resource recovery purposes and describing its boundaries. The boundaries of the proposed special district may include territory outside any such public agency if the territory is within the area of the municipal utility district. When the entire area of any public agency is to be included in the special district it may be described

in the resolutions by name. Certified copies of the resolutions shall be filed with the secretary of the district.