"Health Ills Abound as Farm Runoff Fouls Wells" - Series - NYTimes.com

How much do we know about which chemicals and other things are being washed into the drains of Southern Village from lawn treatments to other disposal? One would think that this could occasionally be tested? Does not everything that runs off ultimately pass into the stream that follows the trail to Culbreth? Does anyone ever test that water? How could we do that?