(Yes this article is a bit old, but posting it because of water woes here in Toledo regarding microcystins, which fortunately are still at safe levels, in my humble opinion. Still, it seems to be wrecking havoc with our mayor’s election bid)
The 35-year-old federal law regulating tap water is so out of date that the water Americans drink can pose what scientists say are serious health risks — and still be legal.
Examine whether contaminants in your water supply met two standards: the legal limits established by the Safe Drinking Water Act, and the typically stricter health guidelines.
The data was collected by an advocacy organization, the Environmental Working Group, who shared it with The Times.
Only 91 contaminants [ still true, I counted them today, 31 July 2015 at http://water.epa.gov/drink/contaminants/index.cfm#List ] are regulated by the Safe Drinking Water Act, yet more than 60,000 chemicals are used within the United States, according to Environmental Protection Agency estimates. Government and independent scientists have scrutinized thousands of those chemicals in recent decades, and identified hundreds associated with a risk of cancer and other diseases at small concentrations in drinking water, according to an analysis of government records by The New York Times.