USGS - science for a changing world

Environmental Health - Toxic Substances


Frequently Asked Questions

What did you find?
This study confirmed that most of the organic wastewater contaminants could be measured at low levels in many streams in susceptible areas (downstream from probable major sources). Although some (14) of the 95 chemicals analyzed for have drinking water standards or other human or ecological health criteria, they were exceeded in very few samples. The study also shows that at most locations the compounds exist in mixtures of many compounds. We would not consider the results to be surprising; rather, the study is the beginning of the long-term process of characterizing the distribution of these compounds in our Nation's waters.

The results of this study are provided in:

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Page Last Modified: Wednesday, 30-Nov-2016 19:23:26 EST