70 ILCS 1205/3-14

Neither the People of the State of Illinois nor any person, firm or corporation, public or private, nor any association of persons shall commence an action contesting either directly or indirectly the annexation of any territory to a park district unless initiated within one year after the date such annexation becomes final or within one year of October 1, 1975, whichever date occurs later. This amendatory Act of 1975 shall apply to annexations made prior to the effective date of the Act as well as those made on or after the effective date. Where a limitation of a shorter period is prescribed by statute such shorter limitation applies.