Drinking water
Tap water quality by city
EPA records for the main water system in each of the 10 largest US cities we cover. In EPA's nationwide PFAS testing, 2 of these systems had PFOA or PFOS above the 4 ng/L limit that takes effect in 2029.
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| City | PFAS | Lead (90th percentile) | Health violations since 2016 |
|---|---|---|---|
| New York, NY | None detected | 10 ppb | 1 |
| Los Angeles, CA | None detected | 3.9 ppb | 2 |
| Chicago, IL | None detected | 6.4 ppb | 0 |
| Houston, TX | 4 PFAS detected | 5 ppb | 1 |
| Phoenix, AZ | 2 PFAS detected | 2.74 ppb | 1 |
| Philadelphia, PA | Above EPA limit | 2 ppb | 0 |
| San Antonio, TX | 3 PFAS detected | 1.6 ppb | 0 |
| San Diego, CA | None detected | 0 ppb | 0 |
| Dallas, TX | Above EPA limit | 1.09 ppb | 0 |
| Jacksonville, FL | 2 PFAS detected | 1.5 ppb | 0 |
Cities are listed by population and come from 7 states. Sources and limits are explained in the methodology. Updated October 2026.