32,500+ zip codes · EPA + EWG + PFAS data · 172M Americans covered
EWG vs EPA Standards
The EPA sets legally enforceable limits, but these are often based on economic and political factors, not just health. EWG's health-based limits reflect what scientists say is truly safe for long-term exposure. Many contaminants are "legal" but not healthy.
What You Can Do
If your water has concerning contaminants, options include: high-quality filtration (reverse osmosis for most contaminants), switching to verified bottled water for drinking, or a combination. The solution depends on your specific contaminants.
Most Common Contaminants
Disinfection Byproducts
95%+Formed when chlorine reacts with organic matter. Found in almost all treated water.
Chromium-6
89%The 'Erin Brockovich' chemical. Carcinogenic, found in 250M+ Americans' water.
PFAS
45%+'Forever chemicals' from non-stick coatings and firefighting foam. Don't break down.
Arsenic
40%Naturally occurring carcinogen. Higher in groundwater-fed systems.
Lead
33%From aging pipes. No safe level. Causes developmental damage in children.
Nitrate
30%From agricultural runoff. Linked to cancer and blue baby syndrome.
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