There is a myriad of drugs, pesticides and chemicals which are known to be inside the water system in the us. Your neighbour is depressed? Good for you. You might get some anti-depressants yourself (no, the body does not break down drugs completely, they are mostly escaping with the wastewater).
But hey, maybe I am just paranoid.
Good watch: https://www.youtube.com/watch?v=0FccVv5NsIY