Tap Water Database Lists Toxins by Zip Code

Tap water is seen in this photo illustration in Washington on Aug. 19, 2019. Alastair Pike/AFP via Getty Images

The Environmental Working Group (EWG) has updated its database on tap water in the United States, revealing where testing has detected potentially deadly pollutants in the nation’s water systems.

First published in 2005, the database was most recently updated in 2018.