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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.
The event had political implications, because the Virginia General Assembly had to recess until Monday, January 13; they had originally been scheduled to start their session on Wednesday. Governor Glenn Youngkin activated the Virginia National Guard, which was made easier because of the state of emergency that had been declared earlier in the ...
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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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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Over half of the U.S. population relies on groundwater for drinking water [1] However, residential, municipal, commercial, industrial, and agricultural activities can all contaminate groundwater. [2]: C-2 In the event of contamination, a community's drinking water supply can develop poor quality or be lost altogether. Groundwater contamination ...