So we pulled out our online maps again...and looked for our local WWTF and found two--one up north and one south. These were approximately 7 and 10 miles away from our school. We zoomed in and definitely saw the big pools of water being treated, and both locations were near different branches of the Chicago River.
Once we saw this, we started thinking about Lake Michigan right near the river and many of us have seen how this river actually connects to the lake. This got us thinking, which way does the river flow? Into the Lake? Away from the Lake? We're only concerned because we know there is still some dissolved particles in the water that leaves the WWTF and we wonder where that stuff goes. We've also got all these questions about where our clean water comes from and regardless of how the water flows, we may have some issues with the cleanliness of both the river and the lake!