California Toughens Drinking Water MCL For Cr6 As Stakeholders Clash

California water regulators have again strengthened the state’s existing drinking water maximum contaminant level (MCL) for hexavalent chromium (Cr6), lowering it from 50 parts per billion (ppb) to 10 ppb, after hearing clashing opposition from environmentalists and industry representatives. The Water Resources Control Board (WRCB) approved the measure during an April 17 meeting where industry and environmental groups each signaled they may challenge the rule, which seeks to replace a regulation the board adopted in 2017 but which was later...