California Regulates Third ‘Forever Chemical’ in Drinking Water

March 5, 2021, 8:24 PM

California water regulators are requiring water suppliers to shift wells offline, blend sources, or notify customers when they detect a third “forever chemical” at certain thresholds.

The State Water Resources Control Board issued an order Friday setting a response level of 5 parts per billion for perfluorobutane sulfonic acid (PFBS). Water suppliers will also be required to notify customers, the state, and others when samples of PFBS exceed 0.5 parts per billion.

PFBS are part of a family of thousands of chemicals known as per- and polyfluoroalkyl substances (PFAS), which are widely used in consumer products because they are grease-, ...

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