Alex Basilevsky runs a blog called The Water Law. He just posted a quick review of a New York Times article: "Cleansing the air at the expense of waterways."
Check em out.
While you're there, check out the entire series of articles in the New York Times Toxic Waters Project. Several of the articles have good information directly applicable to our situation here in the Mara...for example..."Health Ills Abound as Farm Runoff Fouls Wells." The quote: "Dangerous pollutants in drinking water can be traced to the runoff of wastes from farm animals".