The Environmental Protection Agency has called on water utilities across the U.S. to test their supplies for hexavalent chromium, the Washington Post reports, following the release of a study that found the chemical in the tap water of 31 out of 35 cities tested.
Hexavalent chromium, or chromium 6, is a probable human carcinogen that gained notoriety as the contaminant in the water supply of Hinkley, Calif., in the film “Erin Brockovich.”
The EPA announcement followed the Monday release of a study by the Environmental Working Group, a non-profit advocacy organization. The study measured chromium 6 concentrations in water supplies of big and mid-sized cities, from Chicago to Honolulu to Bethesda, Md.
The EPA is not requiring the chromium-6 tests yet, but it is offering instructions to local utilities on how to conduct them.
“The first step is to understand the prevalence of this problem,” said EPA chief Lisa Jackson. “While the EWG study was informative, it only provided a snapshot in time. EPA will work with local and state officials to get a better picture of exactly how widespread this problem is.”
There is no federal regulation on the amount of chromium-6 that can be present in drinking water, but California authorities have recommended a limit of .06 parts per billion.
Of the 31 cities where chromium-6 was detected by the study, 25 were above that proposed California cap. Norman, Okla., notched the highest total with 12.9 parts per billion, or 215 times the limit suggested by California.
The cities that did not register any chromium-6 were Indianapolis, San Antonio, Plano, Tx., and Reno, Nev.
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