W. Va. Code § 8-23-9

The provisions of this article are in addition to and not in derogation of any power and authority vested in any public agency under any Constitutional, statutory or charter provisions which may now or hereafter be in effect, and under no circumstances whatever shall the provisions of this article be construed as in any way limiting the power and authority to take joint or cooperative action or enter into agreements or contracts granted in other articles of this chapter.