A recent AP investigation which tested the drinking water of shows that some Cincinnati area water supplies, including those of Norwood, Reading, Florence and Butler, Warren and Boone Counties, contains caffeine and several over-the-counter and prescription pharmaceutical drugs.
From the original AP article:
The presence of so many prescription drugs — and over-the-counter medicines like acetaminophen and ibuprofen — in so much of our drinking water is heightening worries among scientists of long-term consequences to human health.
In the course of a five-month inquiry, the AP discovered that drugs have been detected in the drinking water supplies of 24 major metropolitan areas — from Southern California to Northern New Jersey, from Detroit to Louisville, Ky.
Water providers rarely disclose results of pharmaceutical screenings, unless pressed, the AP found. For example, the head of a group representing major California suppliers said the public "doesn't know how to interpret the information" and might be unduly alarmed.