Like many other Cook County towns, Streamwood gets its drinking water from Lake Michigan, and has been doing so since the 80s. The water is sourced from four offshore surface water intakes. Because the Illinois EPA considers surface water susceptible to pollutants, all surface water supplies in Illinois must be treated before consumption. This treatment is performed at two plants: the South Water Treatment Plant which serves the southern parts of Chicago and its suburbs, and the Jardine Water Treatment Plant which serves northern Chicago and its suburbs including Streamwood.
From here the water is transported to and stored in tanks throughout the Village, which in this way aims to maximize its accessibility. Streamwood also maintains an emergency backup water supply via ground water wells, which are exercised monthly. Despite treatment though, there is increasing concern about contaminants found in Lake Michigan. The impact is unclear as of yet unknown, but what do we know about the quality of Lake Michigan water?
Website: https://www.streamwood.org/
Wikipedia: https://en.wikipedia.org/wiki/Streamwood,_Illinois