Groups release findings on arsenic, TCE
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The National Institutes of Health National Toxicology Program has also concluded that trichloroethylene (TCE) should be listed as a known human carcinogen, "based on sufficient evidence of carcinogenicity...in humans." TCE is currently listed as a probable human carcinogen and is already regulated in drinking water, so the immediate effect of the change may be muted. But calling it a known human carcinogen could increase public pressure and concern in those systems that must manage TCE in their source water.