W. Va. Code § 16-13D-1
It is the purpose of this article, to permit a public agency, or more than one public agency to make the most efficient use of its or their powers relating to public water supplies, the transportation and treatment of wastewater, and the management of stormwater by enabling a public agency, or more than one public agency to cooperate with other public agencies on a basis of mutual advantage and thereby to provide services and facilities to participating public agencies and to provide for the establishment for the purpose of a quasi-governmental public corporation which shall be known as a regional water authority, a regional wastewater authority, a regional stormwater authority, or any combination thereof. The function of the regional water authority shall be to secure a source of water on a scale larger than is feasible for an individual public agency or agencies acting alone, and to sell water to public service districts, municipalities, publicly and privately owned water utilities, and others. The function of the regional wastewater authority shall be to enable a public agency or agencies to provide the most economical method of transportation and treatment of wastewater and to provide transportation and treatment services to public service districts, municipalities, publicly and privately owned wastewater utilities, and others. The function of the regional stormwater authority shall be to enable a public agency or agencies to provide storm, flood and surface water drainage management services to public service districts, municipalities, publicly and privately owned stormwater utilities, and others. The function of a regional authority that provides any combination of water, wastewater, or stormwater service shall be to enable a public agency or agencies to carry out the joint functions of a water, wastewater, or stormwater regional water authority.
In addition to the purposes for which it may have originally been created, any authority created pursuant to this article may enter into agreements with public agencies, privately owned utilities, and other authorities, for the provision of related services including, but not limited to the following: administration, operation and maintenance, billing, and collection.
W. Va. Code § 16-13D-1