On May 31, 2017, the Superior Court of Sacramento County issued a judgment invalidating the hexavalent chromium maximum contaminant level (MCL) of 10 PPB for drinking water. The court ordered the State Water Resources Control Board (SWRCB) to take the necessary actions to delete the hexavalent chromium MCL from the California Code of Regulations and to file with the court by August 15 proof that it has done so. The change became effective with the Office of Administrative Law filing the change with the Secretary of State, on September 11, 2017. Thus, as of this date, the maximum contaminant level for hexavalent chromium is no longer in effect. The MCL for total chromium of 50 parts per billion (PPB) will remain in place.
However, despite the recent ruling the city continued and finalized its field testing and investigations and will continue to monitor for Chromium 6 on a quarterly basis. It is anticipated the SWRCB will adopt a new MCL for hexavalent chromium in the next 18 months that will be above or below the city's current levels of 17.1 to 24.2 PPB. When this is decided, the city will use previous studies and research on how to deal with the new MCL, if applicable.
**Please note units of measure differ from one report to another. The city uses parts per billion as the unit of measure for hexavalent chromium.