Hexavalent Chromium-6

Hexavalent Chromium-6 Information
Test bottlesOn April 15, the California Department of Public Health (CDPH) issued the nation's first drinking water standard for chromium-6. The standard – known as the Maximum Contaminant Level or MCL – is 10 parts per billion (ppb). This final MCL is a stringent standard that is determined to be both protective of public health over a lifetime of exposure and feasible for public water agencies to attain.

Western’s water supplies meet, and often exceed, all state and federal drinking water standards, including those set for chromium-6, which is widely detected in groundwater supplies throughout the United States; this is because chromium-6 can be naturally occurring in groundwater.

Water TestingOur agency conducts thorough testing to ensure its drinking water meets or exceeds all health and safety standards. Our agency is committed to ensuring high quality water for roughly 23,000 residential and business customers in western Riverside County and Murrieta. For more than 50 years, Western has proactively monitored and tested its groundwater and will vigilantly continue to do so.

Western’s potable water supplies are tested for total chromium, and our agency complies with the state regulatory level. We work with the Metropolitan Water District of Southern California, the CDPH and independent certified testing laboratories to continuously monitor the quality of water supplies.

Water TestingState law requires CDPH to set each MCL as close to the corresponding PHG as is economically and technically feasible and to place primary emphasis on the protection of public health. The cost of treatment to comply with potential limits and increased costs associated with new testing requirements are taken into consideration.

Metropolitan, the supplier of much of the water Western provides to its customers, has one of the most sophisticated water quality monitoring and treatment programs in the world. It performs continuous water monitoring and conducts several hundred water quality tests per day. Western then performs additional daily, weekly and monthly testing with more than 87 routine bacteriological samplings and more than 27 physical samplings taken from more than 40 different locations. These samples are compared to more than 175 state and federal standards.

Western’s number one priority is providing clean, safe, reliable water to our customers. Our agency supports the use of sound science in studies to determine potential health effects of water quality and the development of water quality technology to improve America’s most prevalent groundwater problems stemming from nitrate, perchlorate and volatile organic compounds.