Loading water data...
US tap water ranked by city and state from EPA data — Safe Drinking Water Act compliance, Lead and Copper Rule results and UCMR5 PFAS monitoring. See the highest and lowest-rated cities below, then pick your state for the full A–F ranking of every city we track.
Every city is scored 0–100 and graded A–F from EPA records: health-based violations in the last five years, the latest lead 90th-percentile result, UCMR5 PFAS detections, and 2012–2019 compliance samples. The highest-rated cities right now are Los Angeles, CA, San Diego, CA and Seattle, WA. Pick any state below for its full city-by-city ranking.
Each city starts at 100 and loses points for real EPA findings about its water system: health-based violations in the last five years (SDWIS), its latest Lead and Copper Rule 90th-percentile lead result, PFAS detected in EPA UCMR5 monitoring, and 2012–2019 compliance samples that averaged near or above a limit. Letter grades follow fixed bands: A ≥90, B ≥80, C ≥70, D ≥60, F below 60.
In the current ranking, the highest-rated cities are Los Angeles, CA, San Diego, CA and Seattle, WA — each earns a Grade A with no health-based EPA violations in five years, low lead results, and no PFAS above federal limits. See the full top-10 list above and every state's ranking below.
A high city ranking describes the water leaving the treatment plant, not your faucet. Lead can still enter from household plumbing in homes built before 1986, and some people filter for chlorine taste. Our water filter guide matches certified filters to the contaminants found in your area.
Highest tap water scores in our EPA-based ranking.
Cities with the most concerning EPA records.
The 30 largest water systems we track, ranked best to worst by EPA-based score. Tap a city for its full contaminant report.
| Rank | City | Score | Grade |
|---|---|---|---|
| #1 | Los Angeles, CA | 100/100 | A |
| #2 | San Diego, CA | 100/100 | A |
| #3 | Seattle, WA | 100/100 | A |
| #4 | Lawrenceville, GA | 100/100 | A |
| #5 | Cleveland, OH | 99/100 | A |
| #6 | St Louis, MO | 98/100 | A |
| #7 | Nashville, TN | 97/100 | A |
| #8 | Laurel, MD | 96/100 | A |
| #9 | Las Vegas, NV | 96/100 | A |
| #10 | Oakland, CA | 96/100 | A |
| #11 | Charlotte, NC | 96/100 | A |
| #12 | San Antonio, TX | 94/100 | A |
| #13 | Atlanta, GA | 94/100 | A |
| #14 | Jacksonville, FL | 94/100 | A |
| #15 | Phoenix, AZ | 91/100 | A |
| #16 | Indianapolis, IN | 91/100 | A |
| #17 | Denver, CO | 90/100 | A |
| #18 | Chicago, IL | 88/100 | B |
| #19 | Cincinnati, OH | 86/100 | B |
| #20 | Louisville, KY | 84/100 | B |
| #21 | San Jose, CA | 78/100 | C |
| #22 | Houston, TX | 75/100 | C |
| #23 | Dallas, TX | 74/100 | C |
| #24 | Columbus, OH | 74/100 | C |
| #25 | Austin, TX | 74/100 | C |
| #26 | Fort Worth, TX | 73/100 | C |
| #27 | Baltimore, MD | 72/100 | C |
| #28 | New York, NY | 70/100 | C |
| #29 | Philadelphia, PA | 69/100 | D |
| #30 | Miami, FL | 68/100 | D |
Pick a state to see every city ranked best to worst, with contaminant detail and filter picks for each.