Chromium-6 (hexavalent chromium)
Detectable across most of LA. California PHG: 0.02 ppb.
California's Office of Environmental Health Hazard Assessment set the public health goal at 0.02 ppb. LADWP regularly reports 0.1-0.4 ppb in many service areas.
Reference: EWG Tap Water Database - chromium-6 entry
Chromium-6 (hexavalent chromium), briefly.
An industrial heavy metal made famous by the Hinkley contamination case. Enters water through industrial discharge, natural geology, and corrosion of city pipes.
Not removed by standard activated carbon. Requires zero-valent iron + strong-base anion exchange.
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