A. The district shall be enlarged by resolutions of the boards of supervisors of the participating counties upon the concurrent joint petitions of the commission and the owners of at least 51 percent of the land area of the district within each county, and of at least 51 percent of the land area located within the territory sought to be added to the district; however, any such territory shall be contiguous to the existing district. Joint petitions shall present the information required by subsection A of § 15.2-4603. Upon receipt of such petitions, each county shall use the standards and procedures described in subsections B and C of § 15.2-4603; however, the residents and owners of both the existing district and the area proposed for the enlargement shall have the right to appear and show cause why any property should not be included in the proposed district.
B. If each county board of supervisors finds the enlargement of a local district would be in accordance with the applicable county comprehensive plan for the development of the area, in the best interests of the residents and owners of the property within the proposed district, and in furtherance of the public health, safety, and general welfare, and if each board finds that enlargement of the district does not limit or adversely affect the rights and interests of any party that has contracted with the district, each board shall pass identical resolutions providing for the enlargement of the district.