As of July 21, 1947, the corporate limits of the Sanitary District of Chicago are hereby extended so as to embrace and include within the same territory and tracts of land situated in the County of Cook and State of Illinois, not now in the Sanitary District of Chicago, described as follows:
Sections 20, 21, 28, 29 and 30 in Township 39 North, Range 12, East of the Third P.M., or so much thereof as may fall within the incorporated Villages of Broadview and Westchester.
70 ILCS 2605/116