Any locality, by majority vote of the governing body, may amend the boundaries of an established service district that lies wholly within that locality’s boundaries. If more than one locality is involved in an established service district and those localities desire to amend that service district, a majority vote of the governing body of each locality affected by the amendment is required. Any locality or localities seeking to amend such service district boundaries shall follow the notice and public hearing requirements set out in § 15.2-2400.