There shall be a local department of social services for each county or city under the supervision and management of a local director. However, two or more counties, cities, or any combination thereof, whether having separate local boards or a district board, may unite to establish a local department of social services and appoint a local director of social services to administer this title in such counties and cities, in which case such local director shall be the local director for each such county and city and the expenses incident to such local department shall be divided in such manner as the respective governing bodies provide by agreement.
Va. Code § 63.2-324