Clean water is essential for human survival. More than half of our body is made up of water, and without it, we can only live for a couple of days. How much do we really know about what we’re drinking, though?

Local governments are charged with keeping our water supplies safe, but as I recently learned in the movie “Unacceptable Levels,” one city’s wastewater becomes another city’s drinking water. Also, there’s not a lake or stream left in this country that hasn’t been contaminated in some way.