176 million Americans have PFAS in their tap water. Here's what a countertop filter can actually do and not do.

Almost half of all tap water in the U.S. contains the toxic class of chemicals PFAS, with a significant concentration on the East Coast, according to a recent study from the U.S. Geological Survey.

Checking up on the claims of water filter makers can be a discomfiting maze. Here's how to verify independent water filter certifications. I don't say this to panic you. Your drinking water is ...