File photo: California regulators adopted a drinking water limit on toxic hexavalent chromium. The rule is the first in the nation to specifically target the heavy metal, commonly known as chromium-6, and is expected to reduce the number of cancer and kidney disease cases from long-term ingestion, state officials say.
Until now, California combined its drinking water standard for chromium-6 with the less toxic trivalent chromium, an essential nutrient. California’s new limit on chromium-6 is 10 parts per billion — about 10 drops of water in a swimming pool. The board is required by law to set a limit as close to the public health goal as is economically and technologically feasible.
Ana Maria Perez, a Monterey County resident, urged the board to set a lower limit that would protect communities with chronic water contamination. “We have been waiting for a chromium-6 limit that protects our health,” she said in Spanish. “It’s not fair that many people must get sick.” Studies by the National Toxicology Program changed that. Rodents that drank water with high levels of chromium–6 over two years developed intestinal and oral cancer, results showed.
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