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Naturally occurring carcinogen linked to multiple cancers. Below are US cities ranked by their measured Arsenic levels compared to EPA limits. Higher percentages indicate greater concern.
Vulnerable Populations: Even levels below the EPA limit increase cancer risk. Pregnant women and young children most vulnerable.
Ranked by percentage of the EPA limit, using one real EPA measurement per water system (2012–2019 (SYR4)). Click any city for its full report.
Historical data. Figure shown is the average of the system's 2012–2019 finished-water compliance samples (EPA Six-Year Review 4), non-detects counted as zero. Treat as history, not today's tap water.
| Rank | City | State | Level | Period | EPA Limit | % of Limit | Status | Population |
|---|---|---|---|---|---|---|---|---|
| #1 | Kenai | Alaska | 19.84 ppbAverage of 12 samples | 2012–2019 | 10.00 ppb | 198.4% | Exceeds Limit | 5,700 |
| #2 | Sahuarita | Arizona | 8.19 ppbAverage of 35 samples | 2012–2019 | 10.00 ppb | 81.9% | Elevated | 18,178 |
| #3 | Dunedin | Florida | 7.89 ppbAverage of 16 samples | 2012–2019 | 10.00 ppb | 78.9% | Elevated | 46,161 |
| #4 | El Mirage | Arizona | 7.86 ppbAverage of 49 samples | 2012–2019 | 10.00 ppb | 78.6% | Elevated | 39,884 |
| #5 | Paradise Valley | Arizona | 7.63 ppbAverage of 33 samples | 2012–2019 | 10.00 ppb | 76.3% | Elevated | 14,107 |
| #6 | Maricopa | Arizona | 7.31 ppbAverage of 129 samples | 2012–2019 | 10.00 ppb | 73.1% | Elevated | 84,000 |
| #7 | Show Low | Arizona | 6.97 ppbAverage of 176 samples | 2012–2019 | 10.00 ppb | 69.8% | Elevated | 17,139 |
| #8 | Twin Falls | Idaho | 6.81 ppbAverage of 120 samples | 2012–2019 | 10.00 ppb | 68.1% | Elevated | 56,121 |
| #9 | Wasilla | Alaska | 6.73 ppbAverage of 47 samples | 2012–2019 | 10.00 ppb | 67.3% | Elevated | 18,492 |
| #10 | Goodyear | Arizona | 6.55 ppbAverage of 106 samples | 2012–2019 | 10.00 ppb | 65.5% | Elevated | 50,001 |
| #11 | Apache Junction | Arizona | 6.38 ppbAverage of 65 samples | 2012–2019 | 10.00 ppb | 63.8% | Elevated | 62,055 |
| #12 | St. George | Utah | 6.32 ppbAverage of 198 samples | 2012–2019 | 10.00 ppb | 63.2% | Elevated | 105,240 |
| #13 | Prescott Valley | Arizona | 6.05 ppbAverage of 42 samples | 2012–2019 | 10.00 ppb | 60.5% | Elevated | 57,048 |
| #14 | Gilbert | Arizona | 5.84 ppbAverage of 203 samples | 2012–2019 | 10.00 ppb | 58.4% | Elevated | 247,600 |
| #15 | Nogales | Arizona | 5.83 ppbAverage of 80 samples | 2012–2019 | 10.00 ppb | 58.3% | Elevated | 22,000 |
| #16 | Coeur d'Alene | Idaho | 5.73 ppbAverage of 278 samples | 2012–2019 | 10.00 ppb | 57.3% | Elevated | 54,115 |
| #17 | Paramount | California | 5.71 ppbAverage of 564 samples | 2012–2019 | 10.00 ppb | 57.1% | Elevated | 55,200 |
| #18 | Davis | California | 5.70 ppbAverage of 1 samples | 2012–2019 | 10.00 ppb | 57.0% | Elevated | 67,457 |
| #19 | Surprise | Arizona | 5.59 ppbAverage of 128 samples | 2012–2019 | 10.00 ppb | 55.9% | Elevated | 40,007 |
| #20 | Buckeye | Arizona | 5.53 ppbAverage of 151 samples | 2012–2019 | 10.00 ppb | 55.3% | Elevated | 30,377 |
| #21 | Prescott | Arizona | 5.50 ppbAverage of 76 samples | 2012–2019 | 10.00 ppb | 55.0% | Elevated | 42,217 |
| #22 | Newton | Kansas | 5.50 ppbAverage of 3 samples | 2012–2019 | 10.00 ppb | 55.0% | Elevated | 18,433 |
| #23 | Peoria | Arizona | 5.45 ppbAverage of 274 samples | 2012–2019 | 10.00 ppb | 54.5% | Elevated | 187,676 |
| #24 | Lake Havasu City | Arizona | 5.34 ppbAverage of 35 samples | 2012–2019 | 10.00 ppb | 53.4% | Elevated | 54,610 |
| #25 | Chandler | Arizona | 5.24 ppbAverage of 267 samples | 2012–2019 | 10.00 ppb | 52.4% | Elevated | 247,328 |
| #26 | Seattle | Washington | 5.20 ppbAverage of 2 samples | 2012–2019 | 10.00 ppb | 52.0% | Elevated | 1,161,961 |
| #27 | Phoenix | Arizona | 5.10 ppbAverage of 464 samples | 2012–2019 | 10.00 ppb | 51.0% | Elevated | 1,695,000 |
| #28 | Caldwell | Idaho | 5.08 ppbAverage of 32 samples | 2012–2019 | 10.00 ppb | 50.8% | Elevated | 74,000 |
| #29 | Mesa | Arizona | 5.02 ppbAverage of 135 samples | 2012–2019 | 10.00 ppb | 50.2% | Elevated | 466,000 |
| #30 | Clearwater | Florida | 5.00 ppbAverage of 19 samples | 2012–2019 | 10.00 ppb | 50.0% | Elevated | 115,000 |
| #31 | Chino Hills | California | 4.93 ppbAverage of 179 samples | 2012–2019 | 10.00 ppb | 49.3% | Within Limit | 76,414 |
| #32 | El Paso | Texas | 4.88 ppbAverage of 146 samples | 2012–2019 | 10.00 ppb | 48.8% | Within Limit | 747,168 |
| #33 | Kuna | Idaho | 4.87 ppbAverage of 65 samples | 2012–2019 | 10.00 ppb | 48.7% | Within Limit | 32,038 |
| #34 | Nampa | Idaho | 4.74 ppbAverage of 29 samples | 2012–2019 | 10.00 ppb | 47.4% | Within Limit | 100,200 |
| #35 | Cottonwood | Arizona | 4.74 ppbAverage of 158 samples | 2012–2019 | 10.00 ppb | 47.4% | Within Limit | 11,023 |
| #36 | Avondale | Arizona | 4.59 ppbAverage of 96 samples | 2012–2019 | 10.00 ppb | 45.9% | Within Limit | 96,130 |
| #37 | Victorville | California | 4.55 ppbAverage of 1400 samples | 2012–2019 | 10.00 ppb | 45.5% | Within Limit | 135,983 |
| #38 | Salinas | California | 4.40 ppbAverage of 93 samples | 2012–2019 | 10.00 ppb | 44.0% | Within Limit | 123,679 |
| #39 | Augusta | Maine | 4.17 ppbAverage of 4 samples | 2012–2019 | 10.00 ppb | 41.8% | Within Limit | 13,750 |
| #40 | Manteca | California | 4.15 ppbAverage of 4690 samples | 2012–2019 | 10.00 ppb | 41.5% | Within Limit | 84,928 |
| #41 | Lakewood | California | 3.95 ppbAverage of 312 samples | 2012–2019 | 10.00 ppb | 39.5% | Within Limit | 66,135 |
| #42 | Merced | California | 3.83 ppbAverage of 111 samples | 2012–2019 | 10.00 ppb | 38.3% | Within Limit | 93,692 |
| #43 | Lancaster | California | 3.73 ppbAverage of 708 samples | 2012–2019 | 10.00 ppb | 37.3% | Within Limit | 208,129 |
| #44 | Eloy | Arizona | 3.63 ppbAverage of 41 samples | 2012–2019 | 10.00 ppb | 36.3% | Within Limit | 8,852 |
| #45 | Scottsdale | Arizona | 3.59 ppbAverage of 207 samples | 2012–2019 | 10.00 ppb | 35.9% | Within Limit | 241,361 |
| #46 | Spokane | Washington | 3.52 ppbAverage of 19 samples | 2012–2019 | 10.00 ppb | 35.2% | Within Limit | 346,138 |
| #47 | Tempe | Arizona | 3.43 ppbAverage of 94 samples | 2012–2019 | 10.00 ppb | 34.3% | Within Limit | 165,000 |
| #48 | Paso Robles | California | 3.38 ppbAverage of 180 samples | 2012–2019 | 10.00 ppb | 33.8% | Within Limit | 31,176 |
| #49 | Douglas | Arizona | 3.38 ppbAverage of 17 samples | 2012–2019 | 10.00 ppb | 33.8% | Within Limit | 16,656 |
| #50 | Boise | Idaho | 3.37 ppbAverage of 306 samples | 2012–2019 | 10.00 ppb | 33.7% | Within Limit | 264,978 |
| #51 | Glendale | Arizona | 3.21 ppbAverage of 87 samples | 2012–2019 | 10.00 ppb | 32.1% | Within Limit | 234,766 |
| #52 | Delano | California | 3.18 ppbAverage of 1197 samples | 2012–2019 | 10.00 ppb | 31.8% | Within Limit | 51,428 |
| #53 | Dodge City | Kansas | 3.05 ppbAverage of 43 samples | 2012–2019 | 10.00 ppb | 30.5% | Within Limit | 27,104 |
| #54 | Florence | Arizona | 3.00 ppbAverage of 3 samples | 2012–2019 | 10.00 ppb | 30.0% | Within Limit | 15,900 |
| #55 | Queen Creek | Arizona | 2.96 ppbAverage of 24 samples | 2012–2019 | 10.00 ppb | 29.6% | Within Limit | 95,502 |
| #56 | Palm Desert | California | 2.89 ppbAverage of 857 samples | 2012–2019 | 10.00 ppb | 28.9% | Within Limit | 270,000 |
| #57 | Flagstaff | Arizona | 2.73 ppbAverage of 19 samples | 2012–2019 | 10.00 ppb | 27.3% | Within Limit | 79,796 |
| #58 | Junction City | Kansas | 2.70 ppbAverage of 2 samples | 2012–2019 | 10.00 ppb | 27.0% | Within Limit | 19,167 |
| #59 | Bakersfield | California | 2.69 ppbAverage of 580 samples | 2012–2019 | 10.00 ppb | 26.9% | Within Limit | 267,881 |
| #60 | Mountain Home | Idaho | 2.68 ppbAverage of 12 samples | 2012–2019 | 10.00 ppb | 26.8% | Within Limit | 14,651 |
| #61 | Clermont | Florida | 2.67 ppbAverage of 4 samples | 2012–2019 | 10.00 ppb | 26.7% | Within Limit | 39,279 |
| #62 | Chubbuck | Idaho | 2.67 ppbAverage of 3 samples | 2012–2019 | 10.00 ppb | 26.7% | Within Limit | 15,842 |
| #63 | Encinitas | California | 2.61 ppbAverage of 8 samples | 2012–2019 | 10.00 ppb | 26.1% | Within Limit | 86,458 |
| #64 | El Monte | California | 2.60 ppbAverage of 3 samples | 2012–2019 | 10.00 ppb | 26.0% | Within Limit | 248,000 |
| #65 | Tarpon Springs | Florida | 2.49 ppbAverage of 13 samples | 2012–2019 | 10.00 ppb | 24.9% | Within Limit | 28,875 |
| #66 | Lake Elsinore | California | 2.41 ppbAverage of 128 samples | 2012–2019 | 10.00 ppb | 24.1% | Within Limit | 169,455 |
| #67 | Manhattan | Kansas | 2.40 ppbAverage of 2 samples | 2012–2019 | 10.00 ppb | 24.0% | Within Limit | 54,763 |
| #68 | Liberal | Kansas | 2.34 ppbAverage of 24 samples | 2012–2019 | 10.00 ppb | 23.4% | Within Limit | 19,640 |
| #69 | Lubbock | Texas | 2.33 ppbAverage of 16 samples | 2012–2019 | 10.00 ppb | 23.3% | Within Limit | 275,041 |
| #70 | Tucson | Arizona | 2.25 ppbAverage of 353 samples | 2012–2019 | 10.00 ppb | 22.5% | Within Limit | 732,906 |
| #71 | Kingman | Arizona | 2.25 ppbAverage of 23 samples | 2012–2019 | 10.00 ppb | 22.5% | Within Limit | 45,000 |
| #72 | Azusa | California | 2.14 ppbAverage of 233 samples | 2012–2019 | 10.00 ppb | 21.4% | Within Limit | 110,044 |
| #73 | Omaha | Nebraska | 2.13 ppbAverage of 12 samples | 2012–2019 | 10.00 ppb | 21.3% | Within Limit | 660,000 |
| #74 | Houston | Texas | 2.04 ppbAverage of 159 samples | 2012–2019 | 10.00 ppb | 20.4% | Within Limit | 2,970,543 |
| #75 | Eagle | Idaho | 2.02 ppbAverage of 6 samples | 2012–2019 | 10.00 ppb | 20.2% | Within Limit | 6,108 |
| #76 | Temecula | California | 2.01 ppbAverage of 859 samples | 2012–2019 | 10.00 ppb | 20.1% | Within Limit | 146,147 |
| #77 | Elk Grove | California | 1.96 ppbAverage of 247 samples | 2012–2019 | 10.00 ppb | 19.6% | Within Limit | 43,813 |
| #78 | Yuma | Arizona | 1.95 ppbAverage of 17 samples | 2012–2019 | 10.00 ppb | 19.5% | Within Limit | 103,264 |
| #79 | Post Falls | Idaho | 1.91 ppbAverage of 37 samples | 2012–2019 | 10.00 ppb | 19.1% | Within Limit | 20,285 |
| #80 | Monterey Park | California | 1.82 ppbAverage of 1397 samples | 2012–2019 | 10.00 ppb | 18.2% | Within Limit | 62,183 |
| #81 | Perris | California | 1.77 ppbAverage of 86 samples | 2012–2019 | 10.00 ppb | 17.7% | Within Limit | 666,581 |
| #82 | Brunswick | Maine | 1.76 ppbAverage of 6 samples | 2012–2019 | 10.00 ppb | 17.6% | Within Limit | 18,863 |
| #83 | Olathe | Kansas | 1.69 ppbAverage of 8 samples | 2012–2019 | 10.00 ppb | 16.9% | Within Limit | 143,014 |
| #84 | Pittsburg | California | 1.69 ppbAverage of 15 samples | 2012–2019 | 10.00 ppb | 16.9% | Within Limit | 62,500 |
| #85 | Owensboro | Kentucky | 1.68 ppbAverage of 4 samples | 2012–2019 | 10.00 ppb | 16.8% | Within Limit | 60,473 |
| #86 | Great Bend | Kansas | 1.64 ppbAverage of 28 samples | 2012–2019 | 10.00 ppb | 16.4% | Within Limit | 14,580 |
| #87 | Marana | Arizona | 1.63 ppbAverage of 4 samples | 2012–2019 | 10.00 ppb | 16.3% | Within Limit | 15,162 |
| #88 | Eustis | Florida | 1.62 ppbAverage of 9 samples | 2012–2019 | 10.00 ppb | 16.2% | Within Limit | 39,721 |
| #89 | Rexburg | Idaho | 1.60 ppbAverage of 9 samples | 2012–2019 | 10.00 ppb | 16.0% | Within Limit | 40,695 |
| #90 | Pompano Beach | Florida | 1.53 ppbAverage of 14 samples | 2012–2019 | 10.00 ppb | 15.3% | Within Limit | 99,400 |
| #91 | Pocatello | Idaho | 1.53 ppbAverage of 17 samples | 2012–2019 | 10.00 ppb | 15.3% | Within Limit | 58,231 |
| #92 | Las Vegas | Nevada | 1.52 ppbAverage of 23 samples | 2012–2019 | 10.00 ppb | 15.2% | Within Limit | 1,539,277 |
| #93 | Des Moines | Iowa | 1.50 ppbAverage of 2 samples | 2012–2019 | 10.00 ppb | 15.0% | Within Limit | 246,055 |
| #94 | Los Angeles | California | 1.49 ppbAverage of 569 samples | 2012–2019 | 10.00 ppb | 14.9% | Within Limit | 3,875,566 |
| #95 | Salina | Kansas | 1.49 ppbAverage of 8 samples | 2012–2019 | 10.00 ppb | 14.9% | Within Limit | 46,481 |
| #96 | Wichita | Kansas | 1.38 ppbAverage of 8 samples | 2012–2019 | 10.00 ppb | 13.8% | Within Limit | 395,699 |
| #97 | Cape Coral | Florida | 1.35 ppbAverage of 4 samples | 2012–2019 | 10.00 ppb | 13.5% | Within Limit | 172,693 |
| #98 | Riverside | California | 1.33 ppbAverage of 661 samples | 2012–2019 | 10.00 ppb | 13.3% | Within Limit | 298,398 |
| #99 | Hays | Kansas | 1.33 ppbAverage of 3 samples | 2012–2019 | 10.00 ppb | 13.3% | Within Limit | 21,040 |
| #100 | Somerton | Arizona | 1.30 ppbAverage of 4 samples | 2012–2019 | 10.00 ppb | 13.0% | Within Limit | 14,197 |
Most effective and reliable home treatment. Under-sink point-of-use systems.
Specialized ion exchange resins for arsenic. Professional installation required.
Adsorbent media that binds arsenic. Requires pH adjustment for best results.
No. Arsenic is colorless, tasteless, and odorless. Testing is the only way to know if it's present.
No. Public water supplies using groundwater sources can have elevated arsenic, especially in the Southwest US.
Standard carbon filters do NOT remove arsenic. You need reverse osmosis or specialized media filters.