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.

"There must be something in the water!" is something many of us have probably observed at some point. To scientists, though, this suspicion was very real. For four decades, they have struggled to identify a mysterious "phantom" chemical found in almost all drinking water in the US.

The recent discovery of a new chemical in drinking water has alarmed scientists after a new study concluded it could potentially be toxic. The new research, published Nov. 21 in the Science journal, examines the potential impact of a previously unidentified chemical byproduct of chloramine

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.

A November 2024 study shows that nearly one-third of the U.S. drinking water contains the chemical choronitramide anion, which has never been studied.

According to a new study, there's a reason to beware of drinking tap water. A new toxic chemical in it has been identified -- but how dangerous is it, really?

A newly discovered compound in drinking water has raised questions about its potential health risks. The chemical, known as chloronitramide anion (Cl–N–NO₂⁻), was found in all samples from 10 US drinking water systems that use