Chromium-6, Cr(VI), or Hexavalent Chromium

Chromium-6 in Drinking Water

Chromium-6 (hexavalent chromium) is a naturally occurring element found in rocks, plants, and groundwater. It can also result from industrial processes. While many communities in California and across the nation have trace levels of Chromium-6 in their water, regulatory agencies have set limits to ensure long-term health protection.

Federal and State Standards

The U.S. Environmental Protection Agency (EPA) currently regulates total chromium (which includes Chromium-6 and Chromium-3) at a maximum contaminant level (MCL) of 100 parts per billion (ppb). In California, as of October 1, 2024, the State Resources Water Control Board (SWRCB) authorities have set the MCL for Chromium-6 at 10 ppb. 

Our District’s Current Status

Recent testing has shown that Chromium-6 levels in our district's water are above the newest California standard of 10 ppb, but well within the federal EPA’s total chromium limit of 100 ppb.

It’s important to emphasize:
➡ Your water remains safe to drink.
➡ These levels do not pose an immediate health risk.

Our district is actively working toward a treatment solution to reduce Chromium-6 concentrations in our water system.

Our Commitment to You

We are currently evaluating treatment options and developing a plan to bring Chromium-6 levels well below any applicable future standards. We are also working closely with state regulators and water quality experts to ensure a robust and effective response.

We are committed to keeping you informed throughout this process and to maintaining the high quality of your water.