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These U.S. cities have the lowest levels of detected contaminants in their drinking water. Based on EPA testing data, these communities enjoy some of the purest municipal tap water available anywhere in the country.
Clean tap water has minimal detectable contaminants - including heavy metals, disinfection byproducts, organic chemicals, and microorganisms - all well below EPA safety thresholds. These cities achieve this through excellent source water, modern treatment, and well-maintained infrastructure.
Ranked by overall water purity based on contaminant testing. Click any city for detailed water quality report.
| Rank | City | State | Purity Score | Grade | Population |
|---|---|---|---|---|---|
| 1 | Payson | Arizona | 98/100 | A+ | 15,929 |
| 2 | Anaheim | California | 98/100 | A+ | 346,824 |
| 3 | Romeoville | Illinois | 98/100 | A+ | 39,983 |
| #4 | Cumberland | Maryland | 98/100 | A+ | 19,495 |
| #5 | Pine Bluff | Arkansas | 97/100 | A+ | 41,253 |
| #6 | Palm Desert | California | 97/100 | A+ | 51,988 |
| #7 | San Clemente | California | 97/100 | A+ | 65,040 |
| #8 | West Haven | Connecticut | 97/100 | A+ | 54,666 |
| #9 | Naperville | Illinois | 97/100 | A+ | 149,013 |
| #10 | Greenwood | Indiana | 97/100 | A+ | 63,830 |
| #11 | Salina | Kansas | 97/100 | A+ | 46,994 |
| #12 | Radcliff | Kentucky | 97/100 | A+ | 24,046 |
| #13 | El Paso | Texas | 97/100 | A+ | 1,821 |
| #14 | Prichard | Alabama | 96/100 | A+ | 19,322 |
| #15 | Hanford | California | 96/100 | A+ | 57,232 |
| #16 | Inglewood | California | 96/100 | A+ | 109,398 |
| #17 | Lodi | California | 96/100 | A+ | 67,539 |
| #18 | Monterey Park | California | 96/100 | A+ | 60,105 |
| #19 | San Diego | California | 96/100 | A+ | 1,386,932 |
| #20 | Santa Barbara | California | 96/100 | A+ | 88,665 |
| #21 | Simi Valley | California | 96/100 | A+ | 126,181 |
| #22 | Longmont | Colorado | 96/100 | A+ | 98,885 |
| #23 | Dunedin | Florida | 96/100 | A+ | 36,068 |
| #24 | Lakeland | Florida | 96/100 | A+ | 112,641 |
| #25 | Miami Beach | Florida | 96/100 | A+ | 92,307 |
| #26 | Alpharetta | Georgia | 96/100 | A+ | 65,818 |
| #27 | Statesboro | Georgia | 96/100 | A+ | 33,438 |
| #28 | Council Bluffs | Iowa | 96/100 | A+ | 62,799 |
| #29 | Mason City | Iowa | 96/100 | A+ | 27,338 |
| #30 | West Des Moines | Iowa | 96/100 | A+ | 68,723 |
| #31 | Peoria | Illinois | 96/100 | A+ | 113,150 |
| #32 | Franklin | Indiana | 96/100 | A+ | 26,211 |
| #33 | Ashland | Kentucky | 96/100 | A+ | 21,625 |
| #34 | Hammond | Louisiana | 96/100 | A+ | 21,359 |
| #35 | Everett | Massachusetts | 96/100 | A+ | 49,075 |
| #36 | Framingham | Massachusetts | 96/100 | A+ | 72,362 |
| #37 | Lowell | Massachusetts | 96/100 | A+ | 115,554 |
| #38 | Taunton | Massachusetts | 96/100 | A+ | 59,408 |
| #39 | Weymouth Town | Massachusetts | 96/100 | A+ | 57,213 |
| #40 | Enterprise | Alabama | 95/100 | A+ | 28,711 |
| #41 | Montgomery | Alabama | 95/100 | A+ | 200,603 |
| #42 | Paragould | Arkansas | 95/100 | A+ | 29,908 |
| #43 | West Memphis | Arkansas | 95/100 | A+ | 24,656 |
| #44 | Bullhead City | Arizona | 95/100 | A+ | 41,348 |
| #45 | Chandler | Arizona | 95/100 | A+ | 275,987 |
| #46 | San Luis | Arizona | 95/100 | A+ | 35,257 |
| #47 | Show Low | Arizona | 95/100 | A+ | 11,229 |
| #48 | Laguna Hills | California | 95/100 | A+ | 31,573 |
| #49 | Yorba Linda | California | 95/100 | A+ | 68,103 |
| #50 | Steamboat Springs | Colorado | 95/100 | A+ | 13,932 |
These cities have the fewest contaminants detected in their water supply, with most tests showing levels well below detection limits.
Trihalomethanes (TTHMs) and haloacetic acids (HAA5) - byproducts of chlorine treatment - are significantly below EPA limits.
Lead and arsenic levels are at or below detection limits, indicating excellent source water quality and well-maintained infrastructure.
Clean aquifers or protected reservoirs provide naturally pure water that requires minimal treatment to meet safety standards.