A previously unidentified chemical has been discovered in the tap water of about one-third of U.S. homes, a new study has found, and scientists are actively investigating whether it's toxic.

Despite the identification of a new chemical and the presence of an old chemical, fluoride, in drinking water, experts said most tap water is safe to drink

Tap water for about 1 in 3 Americans could contain a byproduct from the decontamination process that may be toxic, according to a study published Thursday. For over a century, public water systems have used chemical compounds to kill pathogens that cause ...

Scientists discovered a chemical byproduct, chloronitramide anion, in chloraminated tap water across U.S. homes.

Researchers say they have identified a previously unknown, potentially toxic chemical in the treated drinking water consumed by millions of Americans. Chloronitramide anion is a byproduct of the decomposition of chloramine,

For more than four decades, scientists have noticed a mysterious chemical in the treated drinking water of millions of people in the United States, but no one’s been able to pinpoint exactly what it is – until now.

Scientists have identified the byproduct of a chemical used to disinfect tap water and prevent waterborne illnesses. Researchers urge testing for toxicity.

Scientists have discovered a chemical byproduct in treated drinking water that for years, they couldn’t isolate. More research is now on the horizon because the byproduct shares similarities with other toxic compounds,

A chemical byproduct found in some treated drinking water in the U.S. that remained a mystery for more than 40 years may have finally been identified by scientists. The authors of the study, published Thursday in the journal Science,

Researchers have identified a chemical in certain tap water across the United States as chloronitramide anion. Here's what to know.

A newly identified chemical byproduct may be present in drinking water in about a third of U.S. homes, a study found. Scientists think it might be toxic but do not yet know.