A watershed improvement district shall have all of the powers of the soil and water conservation district or districts in which the watershed improvement district is situated, and in addition shall have the authority to levy and collect a tax or service charge to be used for the purposes for which the watershed improvement district was created. No tax shall be levied nor service charge imposed under this article unless two-thirds of the owners of land, which two-thirds owners shall also represent ownership of at least two-thirds of the land area in such district, voting in a referendum called and held in the manner prescribed in this article, approve the levy of a tax to be expended for the purposes of the watershed improvement district.
Va. Code § 10.1-625