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A 2007 toxicity report for the National Toxicology Program provided evidence that high doses of chromium 6 caused cancers of the gastrointestinal tract in rats and mice at levels higher than 5 mg/L of water, (5 ppm, or 5,000 ppb). [41] [42] Average hexavalent chromium levels in Hinkley were recorded at 1.19 ppb, with an estimated peak of 20 ppb.
In 2008 the Vermont legislature revised statute "Title 10, Chapter 048: Groundwater Protection" saying "the groundwater resources of the State are held in trust for the public" and "the groundwater resources of the State shall be managed to minimize the risks of groundwater quality deterioration by regulating human activities that present risks ...
An example of this chemical causing adverse health issues is through a well-known hexavalent chromium (chromium 6) pollution event in Hinkley, California. Groundwater contamination in Hinkley was caused by water containing hexavalent chromium being dumped on the ground by Pacific Gas and Electric (PG&E) from 1952 to 1966. PG&E used this ...
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The 580 ppb chromium(VI) in the groundwater in Hinkley exceeded the 100-ppb total chromium maximum contaminant level (MCL) set by the United States Environmental Protection Agency (EPA). [60] It also exceeded the California MCL of 50 ppb (as of November 2008 [update] ) for all types of chromium. [ 61 ]
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Groundwater pollution (also called groundwater contamination) occurs when pollutants are released to the ground and make their way into groundwater.This type of water pollution can also occur naturally due to the presence of a minor and unwanted constituent, contaminant, or impurity in the groundwater, in which case it is more likely referred to as contamination rather than pollution.
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