During the spring of 2001, the Illinois EPA began a groundwater investigation just east of I-355 near Downers Grove. This investigation is in response to citizen concerns related to recent private well sampling in neighboring Lisle. Results of a few samples in Downers Grove in May showed some solvent contamination in scattered wells. Consequently, Illinois EPA decided to initiate a separate investigation in Downers Grove to identify contaminated wells and potential sources.
The Illinois EPA collected samples from private water wells in unincorporated Downers Grove during the week of July 16, 2001. The results from theses samples constitute the first phase of the Downers Grove Groundwater Investigation. In this first round of sampling, approximately 160 wells, in three areas were analyzed for levels of solvent-type chemicals, known as volatile organic chemicals (VOCs).