They do a lot of water sampling here but with an emphasis on radioactivity from Hanford, probably a greater threat if there were ever a significant breach into the river. At any rate, I’m a caffeine-free Diet Coke drinker (never tap water) and chaste, too!
I did hear at some point that enriched uranium contamination was found in the Nolichucky River and Davy Crockett Lake, but like I said that's downstream.
Not that I am totally oblivious to what happens to my neighbors. :o/