(a) The district may join and pay dues to an organization that:
(1) enjoys tax-exempt status under Section 501(c)(3), (4), or (6), Internal Revenue Code of 1986, as amended; and
(2) performs a service or provides an activity consistent with the furtherance of a district purpose.
(b) An expenditure of public money for membership in the organization is considered to further a district purpose and to be for a public purpose.