Water Quality by County
3,254 counties with public water systems.
| County | State | Systems | Population | Violations |
|---|---|---|---|---|
| Etowah | Alabama | 17 | 124,954 | 963 |
| Wayne | North Carolina | 11 | 124,816 | 1,280 |
| Walton | Florida | 27 | 124,667 | 468 |
| Tom Green | Texas | 23 | 124,139 | 1,835 |
| Merrimack | New Hampshire | 247 | 124,101 | 14,635 |
| Rincon Municipio | Puerto Rico | 1 | 123,885 | 1,566 |
| Citrus | Florida | 149 | 123,566 | 5,589 |
| Paulding | Georgia | 3 | 123,096 | 76 |
| Story | Iowa | 21 | 121,108 | 1,299 |
| Faulkner | Arkansas | 14 | 120,979 | 560 |
| Parker | Texas | 105 | 120,277 | 15,813 |
| Chemung | New York | 78 | 120,205 | 4,249 |
| Greene | Arkansas | 7 | 119,804 | 164 |
| Sheboygan | Wisconsin | 215 | 119,678 | 5,035 |
| Chelan | Washington | 132 | 118,807 | 4,357 |
| Orange | North Carolina | 67 | 118,561 | 11,617 |
| Arecibo Municipio | Puerto Rico | 12 | 118,557 | 2,669 |
| Somerset | New Jersey | 93 | 118,171 | 2,716 |
| Rockwall | Texas | 7 | 117,934 | 284 |
| Litchfield | Connecticut | 345 | 117,396 | 27,780 |
| Cumberland | New Jersey | 126 | 117,254 | 9,453 |
| Columbia | New York | 202 | 116,249 | 14,204 |
| Bradley | Tennessee | 3 | 116,194 | 309 |
| Wood | Ohio | 55 | 116,066 | 3,536 |
| Cowlitz | Washington | 76 | 115,789 | 13,735 |
| Medina | Ohio | 63 | 115,354 | 3,445 |
| County 09013 | 09 | 23 | 114,768 | 2,232 |
| Yuba | California | 69 | 113,585 | 545 |
| Daviess | Kentucky | 5 | 112,731 | 830 |
| LaSalle | Illinois | 174 | 112,392 | 13,172 |
| St. Landry Parish | Louisiana | 29 | 111,945 | 2,173 |
| Allegan | Michigan | 318 | 110,806 | 5,441 |
| Elmore | Alabama | 10 | 110,629 | 608 |
| Douglas | Georgia | 1 | 110,219 | 6 |
| Warren | New Jersey | 225 | 109,996 | 9,973 |
| Clinton | New York | 164 | 109,907 | 17,406 |
| Limestone | Alabama | 4 | 109,826 | 664 |
| Robeson | North Carolina | 13 | 109,476 | 2,256 |
| Broomfield | Colorado | 3 | 108,783 | 24 |
| Spotsylvania | Virginia | 38 | 108,100 | 1,494 |
| Bartow | Georgia | 12 | 107,549 | 523 |
| Carroll | Georgia | 10 | 107,402 | 615 |
| Strafford | New Hampshire | 132 | 107,387 | 8,921 |
| Clark | Ohio | 92 | 106,745 | 9,196 |
| Andrew | Missouri | 10 | 106,510 | 578 |
| Flathead | Montana | 324 | 105,538 | 20,270 |
| Liberty | Texas | 94 | 105,526 | 4,736 |
| Dougherty | Georgia | 7 | 105,423 | 197 |
| Fayette | Georgia | 13 | 105,265 | 989 |
| Carver | Minnesota | 68 | 104,814 | 570 |
| Cleveland | North Carolina | 10 | 104,768 | 1,513 |
| Macon | Illinois | 25 | 104,510 | 886 |
| Garland | Arkansas | 28 | 104,240 | 1,034 |
| Cabell | West Virginia | 2 | 104,093 | 362 |
| Island | Washington | 308 | 104,049 | 25,141 |
| Richland | Ohio | 121 | 103,898 | 6,673 |
| San Juan | New Mexico | 22 | 103,721 | 5,118 |
| Nevada | California | 84 | 103,625 | 1,551 |
| Marathon | Wisconsin | 195 | 103,485 | 5,385 |
| Eagle | Colorado | 47 | 103,381 | 4,199 |
| Albemarle | Virginia | 73 | 103,266 | 3,000 |
| Angelina | Texas | 26 | 103,149 | 5,984 |
| Madison | Indiana | 49 | 103,123 | 2,880 |
| Tompkins | New York | 112 | 102,994 | 1,977 |
| Highlands | Florida | 71 | 102,486 | 2,009 |
| Pulaski | Kentucky | 8 | 102,144 | 931 |
| Blair | Pennsylvania | 53 | 101,979 | 8,263 |
| Florence | South Carolina | 24 | 101,758 | 194 |
| Grafton | New Hampshire | 269 | 101,638 | 20,540 |
| Lebanon | Pennsylvania | 109 | 101,380 | 8,644 |
| Moore | North Carolina | 65 | 101,362 | 16,035 |
| Putnam | Tennessee | 9 | 101,103 | 427 |
| DeKalb | Illinois | 57 | 100,590 | 2,730 |
| Boone | Kentucky | 9 | 100,541 | 1,345 |
| Fairfield | Ohio | 75 | 100,143 | 6,414 |
| Oswego | New York | 166 | 99,982 | 11,456 |
| Oconee | South Carolina | 56 | 99,852 | 837 |
| Woodbury | Iowa | 32 | 99,461 | 1,715 |
| Madison | Tennessee | 21 | 99,428 | 740 |
| Whitfield | Georgia | 1 | 99,315 | 11 |
| Mono | California | 93 | 99,269 | 2,450 |
| Navajo | Arizona | 63 | 99,221 | 9,952 |
| Bay | Michigan | 29 | 99,076 | 248 |
| La Crosse | Wisconsin | 125 | 98,968 | 3,426 |
| Mercer | Pennsylvania | 146 | 98,473 | 18,095 |
| Floyd | Georgia | 8 | 98,457 | 162 |
| Jackson | Alabama | 8 | 97,683 | 482 |
| Delaware | Indiana | 66 | 97,615 | 4,362 |
| Middlesex | Connecticut | 276 | 97,390 | 25,593 |
| Berkeley | West Virginia | 23 | 97,328 | 4,057 |
| Lancaster | South Carolina | 8 | 96,836 | 231 |
| Laramie | Wyoming | 51 | 96,725 | 2,478 |
| Cascade | Montana | 98 | 96,521 | 15,613 |
| Lafourche Parish | Louisiana | 2 | 96,471 | 191 |
| Lowndes | Georgia | 78 | 96,289 | 5,087 |
| Newton | Georgia | 13 | 95,877 | 575 |
| Anderson | Tennessee | 7 | 95,525 | 437 |
| Kankakee | Illinois | 65 | 95,216 | 17,039 |
| LaPorte | Indiana | 126 | 95,164 | 20,287 |
| Walworth | Wisconsin | 252 | 95,076 | 10,507 |