that questn, i headed down rir. st above washington, i found another usgs team sampling wer from the potomationwi survey checking for 300 emerging contaminantin our drinking water they were loing for well-known pollutts like pesticides, and for newly detected ctaminants found in pharmeuticals, body lotis, soaps and deodorants. inll, they found 85 compounds we're justow starting to be able to even anaze for in war. but the treatment isn't innded to remove the products. >> smithwhat makes this a matter of concern is that is the intake for the washingt aqueduct, where one milln people in the dc area get eir drking water. few of us may reale it, but people dnstream use waste water fromeople upstream. the tomac, like other rivers, serves as both the place whe we dump our waewater and the place where we getur drinking water. it's one big connuous recying operation from the toet or the shower to the tap. >> the riv flows down, a communy takes water out of the river, puts it bacthrough a wastewer plant a few miles down, out, bac out, back. and with proper regulaon and proper processes at e wastewa