FILE - The San Francisco skyline is visible on April 26, 2023. 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.
“This really leaves a lot of California communities unprotected from that really potent carcinogen,” said Tasha Stoiber, senior scientist with the Environmental Working Group. Cástulo Estrada, board vice president of the Coachella Valley Water District and utilities manager for Coachella city, said the limit would have “unprecedented” impacts on residents and customers. He said all six of the city of Coachella's wells have chromium-6 above 10 parts per billion and that installing technology to lower levels to the limit would cost an estimated $90 million. “That would increase monthly bills.
While scientists have known for decades that inhaling chromium-6 can cause lung cancer, it was uncertain for a long time whether ingestion could cause cancer, too.
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