U.S. water supply contaminated by pharmaceuticals

the AP obtained the results of tests conducted by independent researchers that showed otherwise. For example, water department officials in New Orleans said their water had not been tested for pharmaceuticals, but a Tulane University researcher and his students have published a study that found the pain reliever naproxen, the sex hormone estrone and the anti-cholesterol drug byproduct clofibric acid in treated drinking water. Of the 28 major metropolitan areas where tests were performed on drinking water supplies, only Albuquerque; Austin, Texas; and Virginia Beach, Virginia said tests were negative. The drinking water in Dallas has been tested, but officials are awaiting results. Arlington, Texas, acknowledged that traces of a pharmaceutical were detected in its drinking water but cited post-9/11 security concerns in refusing to identify the drug.

The AP also contacted 52 small water providers — one in each state, and two each in Missouri and Texas — which serve communities with populations around 25,000. All but one said their drinking water had not been screened for pharmaceuticals; officials in Emporia, Kansas, refused to answer AP’s questions, also citing post-9/11 issues. Rural consumers who draw water from their own wells are not in the clear either, experts say. The Stroud Water Research Center, in Avondale, Pennsylvania, has measured water samples from New York City’s upstate watershed for caffeine, a common contaminant that scientists often look for as a possible signal for the presence of other pharmaceuticals. Though more caffeine was detected at suburban sites, researcher Anthony Aufdenkampe was struck by the relatively high levels even in less populated areas. He suspects it escapes from failed septic tanks, maybe with other drugs. “Septic systems are essentially small treatment plants that are essentially unmanaged and therefore tend to fail,” Aufdenkampe said. Even users of bottled water and home filtration systems do not necessarily avoid exposure. Bottlers, some of which simply repackage tap water, do not typically treat or test for pharmaceuticals, according to the industry’s main trade group. The same goes for the makers of home filtration systems.

Contamination is not confined to the United States. More than 100 different pharmaceuticals have been detected in lakes, rivers, reservoirs and streams throughout the world. Studies have detected pharmaceuticals in waters throughout Asia, Australia, Canada, and Europe — even in Swiss lakes and the North Sea. For example, in Canada, a study of twenty Ontario drinking water treatment plants by a national research institute found