You might want to think twice about filling your glass from the sink. There may be cancer-causing products in tap water.

That's according to a new report from the Environmental Working Group (EWG).

Researchers say they found 22 carcinogens -- including arsenic, uranium and radium -- in tap water.

The watchdog group says there may be a health risk even though most tap water meets the legal standards put in place by the federal government.

The study was published Thursday in the journal Heliyon.