W. Va. Code § 8-20-11a

The municipality and any county government, state government and federal government served by the services of the combined system shall be subject to the same rates, fees or charges established in this article or to rates, fees or charges established in harmony therewith, for service rendered to the governmental entity, and shall pay such rates, fees or charges when due from corporate funds and the same shall be considered to be part of the revenue of the combined system as defined in this article, and be applied as provided in this article, for the application of such revenues. However, no rates, fees or charges for combined services or stormwater services may be assessed against highways, road and drainage easements, and/or stormwater facilities constructed, owned and/or operated by the West Virginia Division of Highways.