The new rules require that water systems monitor for six toxic chemicals known as PFAS. The manmade chemicals, officially called per-and polyfluoroalkyl substances, are notoriously hard to destroy. They build up in the body and don't break down in the environment.
Manufacturers began phasing out production of two PFAS chemicals, known as PFOA and PFOS, decades ago but they are still prevalent in the environment.
The federal agency estimates that as many as 100 million Americans are using and drinking tap water contaminated with the chemicals.
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