The boards of directors of the Newport Heights Irrigation District, Fairview County Water District, the Newport Mesa County Water District, and the city council of the City of Costa Mesa, may adopt, any time prior to the first day of the second month following the sixty-first day after this part becomes effective, resolutions approving the dissolution of their districts and merger into the Costa Mesa County Water District pursuant to the provisions of this part. The failure of any of these districts or the city to adopt such a resolution shall not prevent the dissolution, merger and creation of the Costa Mesa County Water District, but shall only prevent the dissolution, merger and transfer of such district or city system as provided in this part. The territory of any district or city not adopting such resolution shall be excluded from Section 33215 hereof and shall not be part of the Costa Mesa County Water District as provided in this part.