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The contamination resulted in a $333 million settlement in 1996. The clean-up process is ongoing as of 2022, with monthly monitoring reports submitted by PG&E. [69] This case has led to California being the only state in the US to adopt an MCL of 10 ppb specifically for hexavalent chromium instead of relying on an overall total chromium count. [70]
Hexavalent chromium (chromium(VI), Cr(VI), chromium 6) is any chemical compound that contains the element chromium in the +6 oxidation state (thus hexavalent). [1] It has been identified as carcinogenic, which is of concern since approximately 136,000 tonnes (150,000 tons) of hexavalent chromium were produced in 1985. [ 2 ]
Hexavalent chromium is a toxic metal, known to cause several health problems and is a carcinogen. Exposure to hexavalent chromium can cause irritation and problems in the respiratory tract, stomach, and small intestine. It is linked to several cancers, such as lung cancer, oral cancer, and intestinal cancer. [11]
Despite the nearly 15,000 Per- and Polyfluoroalkyl Substances (PFAS) known, the EPA singled out six in the first-ever federal limits for these chemicals in drinking water. PFAS, dubbed "forever ...
A news release from the EPA estimates that between about 6% and 10% of 66,000 drinking water systems subject to the new rules may have to take action to reduce PFAS to meet the new standards.
California was the first state to put into effect an MCL for hexavalent chromium (chromium 6) in drinking water in July 2014, setting a limit of 10 ppb. A 2015 United States Geological Survey (USGS) report, based on the EPA's 2010 review of the health effects of chromium 6 in drinking water, re-examined related federal regulations.
The EPA has proposed the first-ever drinking water standards for two “forever chemicals” and a mixture of four others that the agency says mark a milestone in its effort to protect public ...
The type of PFAS remediation technology selected is often a reflection of the PFAS contamination levels and the PFAS signature (i.e. the combination of short- and long-chain PFAS substances present) in conjunction with the site-specific water chemistry and cross contaminants present in the liquid stream.
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