sentences:  Chapters range in geographic size from a single watershed to an entire state and in membership size from less than 20 to more than 4,000.Because TU is a publicly supported 501(c)3 organized under a group exemption, each chapter (and council) is required to have its own employer identification number (EIN) and file its own tax forms with the IRS.TU chapters; therefore, are financially independent of the national organization.