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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.
A map of Superfund sites as of October 2013. Red indicates currently on final National Priority List, yellow is proposed, green is deleted (usually meaning having been cleaned up).
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 ...
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The well was found to be contaminated with chromium(VI). The Midland groundwater reached higher levels of contamination than the EPA mandated maximum contaminant level (MCL) of 100 parts per billion. The current groundwater plume of chromium lies under approximately 260 acres of land at the West County Road 112 Groundwater Site.
Water levels in wells across Texas are running low because of the extreme drought, groundwater experts say. Drought conditions in the state are getting worse by the week.
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