Village of Chicago Ridge issued the following announcement on April 4.
The Metropolitan Water Reclamation District will host an Open House on Saturday, May 18th, 2019 from 9;00 A.M. to 1:00 P.M. to celebrate its 130th Anniversary and Infrastructure Week. Tours, free compost, free oak saplings and kid-friendly activities will be available. The Open House will take place at the Calumet, O’Brien and Stickney locations. Please see attached flyer for more information.
Original source can be found here.