Va. Code § 15.2-2147
If any city acquires by purchase, lease, condemnation or otherwise, the property, rights and franchises of any private or public service corporation operating a waterworks system, whose plant is located within one mile of the corporate limits of any other city and whose mains and pipes are laid in the streets of such other city, and could thereby prevent the other city from procuring water from the plant of such corporation, the city so acquiring such property shall establish and maintain the same fees for water under similar conditions and circumstances and furnish the same quality and pressure of water, all conditions considered, to all consumers of the same class in the other city as is furnished to consumers in the city acquiring the property.
Va. Code § 15.2-2147