What’s in Your Water?
Explore 329 substances found in American drinking water. Evidence-based data from EWG, PubChem, and the EPA — organized for everyone from concerned parents to researchers.
329
Substances
297
With CAS #
18
Health Effects
3
Data Sources
Common Contaminants
Arsenic
CAS 7440-38-2
Arsenic is a potent carcinogen and common contaminant in drinking water. Arsenic causes thousands of cases of cancer eac…
Lead
CAS 7439-92-1
Lead contaminates drinking water when it leaches from pipes and plumbing fixtures. Lead exposure during childhood perman…
Chloroform
CAS 67-66-3
Atrazine
CAS 1912-24-9
Atrazine is a herbicide commonly detected in drinking water that comes from cornfield and other agricultural runoff. It …
Benzene
CAS 71-43-2
Chromium (hexavalent)
CAS 7440-47-3