Every year, more than 286 million Americans receive their drinking water from a community water system regulated by the U.S. Environmental Protection Agency (EPA). But "regulated" doesn't automatically mean "perfectly safe." Violations happen, aging infrastructure leaches contaminants, and private well owners have no federal oversight at all.
So: is your tap water safe? Here's how to find out.
Start with the Consumer Confidence Report (CCR)
All community water systems serving more than 25 people must send customers an annual Consumer Confidence Report (CCR), also called a water quality report, by July 1 each year. The report lists every regulated contaminant detected, the level found, the EPA's Maximum Contaminant Level (MCL), and the likely source.
You can find your CCR on your utility's website or at the EPA's CCR database. If a contaminant is listed below the MCL, it meets federal standards, but "meets standards" and "zero risk" are not the same thing. Some MCLs, like lead (action level 15 ppb) and arsenic (MCL 10 ppb), are set by feasibility and cost, not purely by health science.
Check the EPA Violation Database
The EPA's Safe Drinking Water Information System (SDWIS) tracks every violation reported by every public water system in the country. SafeWater pulls this data and makes it searchable. You can look up your water system and see the full violation history, including health-based violations (contaminant exceeded an MCL) and reporting violations (utility didn't submit required testing on time).
Utilities that repeatedly fail to report are sometimes hiding problems. Treat reporting violations as a yellow flag.
Know the Red-Flag Contaminants
Not all contaminants carry equal risk. Pay closest attention to:
- Lead: no safe level for children; comes from your home's plumbing, not the treatment plant. See lead data →
- PFAS ("forever chemicals"): the EPA set new MCLs of 4 ppt for PFOA and PFOS in April 2024. See PFAS tracker →
- Nitrates: MCL is 10 mg/L; dangerous for infants under 6 months ("blue baby syndrome").
- Arsenic: MCL 10 ppb; long-term exposure linked to cancer.
Test Your Water Directly
If you're on a private well, or if you're concerned about lead from your home's pipes (which a utility test at the plant won't catch), order a certified lab test. The EPA recommends testing well water at minimum once a year for bacteria and nitrates, and more frequently if you live near agriculture or industrial sites.
Certified labs in your state can be found through the EPA Lab Certification program.
Compare Your State
Water quality varies enormously across the country. Some states have far more utilities with health-based violations than others. Check how your state ranks on SafeWater's state rankings page →
What to Do If You Find a Problem
If your water system has active violations or your test results are above safe levels: run cold water for 30–60 seconds before using it (reduces lead from pipes), use an NSF-certified filter appropriate to the contaminant, and contact your water utility or local health department. For urgent situations like a boil-water notice, follow utility instructions immediately.