Hexavalent chromium (“Cr6”) is an element that is found in drinking water from natural sources and from historical industrial uses. At present, there is no separate drinking water standard for Cr6. There is a federal and state drinking water standard for total chromium (all valences of chromium including Cr6). The federal drinking water standard for total chromium is 100 micrograms per liter of water (“ug/L”) and the California drinking water standard for total chromium is...

On February 10, 2012, the U.S. Environmental Protection Agency (EPA) posted the agency’s final toxicological review of tetrachloroethylene. Tetrachloroethylene – also known as PERC, or PCE – is a solvent widely used in the dry cleaning industry. The review characterizes PERC as a “likely human carcinogen” and provides estimates for both cancer and non-cancer effects of exposure to the chemical. EPA's new calculated cancer risks for PCE are lower than the current values used by EPA,...