Public Water Systems
143,076 active public water systems, tracked from EPA's Safe Drinking Water Information System (SDWIS) across all 50 states. See our methodology.
| System Name | Location | Population | Violations | PFAS |
|---|---|---|---|---|
| New York City System | Valhalla, NY | 8,271,000 | 47 | Clean |
| Los Angeles-City, Dept. of Water & Power | Los Angeles, CA | 3,875,566 | 33 | Clean |
| City of Houston | Houston, TX | 2,970,543 | 29 | Detected |
| Chicago | Chicago, IL | 2,746,388 | 212 | Clean |
| Mwra | Chelsea, MA | 2,660,000 | 6 | - |
| Mdwasa - Main System | Miami, FL | 2,377,460 | 26 | Detected |
| San Antonio Water System | San Antonio, TX | 2,113,151 | 38 | Detected |
| Washington Suburban Sanitary Commission | Laurel, MD | 1,900,000 | 2 | Detected |
| Phoenix City Of | Phoenix, AZ | 1,695,000 | 84 | Detected |
| Philadelphia Water Department | Philadelphia, PA | 1,600,000 | 130 | Detected |
| City of Baltimore | Baltimore, MD | 1,600,000 | 73 | Detected |
| Las Vegas Valley Water District | Las Vegas, NV | 1,539,277 | 193 | Detected |
| East Bay MUD | Oakland, CA | 1,442,800 | 14 | Detected |
| San Diego, City Of | San Diego, CA | 1,385,379 | 33 | Clean |
| Dallas Water Utility | Dallas, TX | 1,356,479 | 4 | Detected |
| Cleveland Public Water System | Cleveland, OH | 1,308,955 | 195 | Clean |
| Columbus Public Water System | Columbus, OH | 1,305,946 | 33 | Detected |
| Denver Water Board | Denver, CO | 1,287,000 | 383 | Clean |
| Charlotte Water | Charlotte, NC | 1,163,701 | 43 | Detected |
| Fairfax County Water Authority | Herndon, VA | 1,121,613 | 1 | Detected |
| City of Austin Water & Wastewater | Austin, TX | 1,115,323 | 29 | Detected |
| MO American St Louis St Charles Counties | Chesterfield, MO | 1,111,000 | 9 | Detected |
| Suffolk County Water Authority | Hauppauge, NY | 1,100,000 | 42 | Detected |
| Seattle Public Utilities | Seattle, WA | 1,091,904 | 29 | Clean |
| Atlanta | Atlanta, GA | 1,089,893 | 59 | Detected |
| Metropolitano | San Juan, PR | 1,077,332 | 1,673 | Detected |
| San Jose Water | San Jose, CA | 1,039,920 | 14 | Detected |
| Gwinnett Co. Dept. of Water Resources | Lawrenceville, GA | 975,000 | 19 | Clean |
| City of Fort Worth | Fort Worth, TX | 955,900 | 27 | Detected |
| Citizens Water - Indianapolis | Indianapolis, IN | 880,345 | 37 | Detected |
| Sfpuc City Distribution Division | Burlingame, CA | 848,019 | 0 | Clean |
| Jea Major Grid | Jacksonville, FL | 826,664 | 73 | Detected |
| Aqua PA Main System | Bryn Mawr, PA | 822,600 | 453 | Detected |
| Veolia Water New Jersey Hackensack | Haworth, NJ | 792,713 | 164 | Detected |
| Metro Water Services | Nashville, TN | 778,153 | 36 | Clean |
| Louisville Water Company | Louisville, KY | 764,769 | 660 | Detected |
| Cincinnati Public Water System | Cincinnati, OH | 750,200 | 0 | Detected |
| El Paso Water Utilities Public Service B | El Paso, TX | 747,168 | 246 | Detected |
| Dekalb County | Decatur, GA | 743,000 | 8 | Clean |
| City of Tampa Water Department | Tampa, FL | 733,886 | 34 | Detected |
| Tucson City Of | Tucson, AZ | 732,906 | 2,267 | Detected |
| Cobb County | Marietta, GA | 695,000 | 6 | Detected |
| PA Amer Water Co-Pittsburgh | McMurray, PA | 686,000 | 28 | Clean |
| Boston Water and Sewer Commission (Mwra) | Boston, MA | 675,647 | 8 | Clean |
| Eastern Municipal WD | Perris, CA | 666,581 | 6 | Clean |
| Portland Water Bureau | Portland, OR | 666,200 | 32 | Clean |
| Metropolitan Utilities District | Omaha, NE | 660,000 | 12 | Clean |
| Memphis Light, Gas, & Water | Memphis, TN | 659,500 | 7 | Clean |
| Oklahoma City | Oklahoma City, OK | 644,000 | 34 | Detected |
| Raleigh, City Of | Raleigh, NC | 640,000 | 24 | Detected |
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