A California Water Utility experiencing elevated levels of hexavalent chromium [Cr(VI)] in their drinking water supply is the first commercial application to use the MetalGuard™ Cr(VI) real-time water quality monitor developed by AMS. The monitor was installed to provide high frequency, reliable, and accurate data on hexavalent and total chromium levels during the pilot test of a Reduction/Coagulation/Oxidation/Filtration (RCOF) process.