I can overwhelm you with news about the amount of chemicals and drugs in our nations water supplies as there are thousands of them. But this one article says it all. There are pharmaceutical drugs found in every stream tested. Albeit in this report they haven't tested many rivers but the testing outcome will be the same for 95% of all rivers world wide.
They have been finding endocrine disrupting compounds (drugs) in rivers for well over 25 years....check this out;
From the East Coast to the West Coast water pollution is every where. Here is a news article about Portland OR, high lead level. It they started testing for other items like drugs no one would be drinking unfiltered water!