Water Quality by County
3,254 counties with public water systems.
| County | State | Systems | Population | Violations |
|---|---|---|---|---|
| County 09003 | 09 | 3 | 695 | 752 |
| Hyde | South Dakota | 1 | 682 | 143 |
| Sully | South Dakota | 1 | 658 | 139 |
| County 09049 | 09 | 4 | 648 | 464 |
| Campbell | South Dakota | 2 | 645 | 55 |
| Glasscock | Texas | 3 | 640 | 217 |
| Taliaferro | Georgia | 1 | 621 | 84 |
| Wibaux | Montana | 2 | 577 | 209 |
| Mellette | South Dakota | 1 | 533 | 58 |
| Prairie | Montana | 7 | 523 | 1,532 |
| Kenedy | Texas | 4 | 516 | 378 |
| Golden Valley | Montana | 4 | 514 | 1,939 |
| Wheeler | Nebraska | 5 | 498 | 159 |
| Ziebach | South Dakota | 1 | 494 | 37 |
| Roberts | Texas | 2 | 494 | 89 |
| Jones | South Dakota | 1 | 488 | 33 |
| County 09033 | 09 | 1 | 487 | 5 |
| Sheridan | North Dakota | 2 | 478 | 103 |
| Thomas | Nebraska | 8 | 475 | 196 |
| Hooker | Nebraska | 3 | 465 | 27 |
| Highland | Virginia | 2 | 415 | 52 |
| Ceiba Municipio | Puerto Rico | 1 | 414 | 250 |
| County 06071 | 06 | 1 | 400 | 1 |
| Sioux | Nebraska | 4 | 381 | 95 |
| Harding | South Dakota | 1 | 346 | 229 |
| Loup | Nebraska | 4 | 345 | 57 |
| County 10051 | 10 | 1 | 330 | 66 |
| Logan | Nebraska | 2 | 330 | 66 |
| Arthur | Nebraska | 4 | 315 | 115 |
| Borden | Texas | 2 | 300 | 724 |
| King | Texas | 1 | 291 | 566 |
| Hayes | Nebraska | 2 | 255 | 171 |
| County 09051 | 09 | 1 | 222 | 254 |
| McPherson | Nebraska | 4 | 215 | 80 |
| Keya Paha | Nebraska | 1 | 200 | 57 |
| County 10049 | 10 | 1 | 198 | 61 |
| Grant | Nebraska | 2 | 193 | 71 |
| County 09035 | 09 | 1 | 190 | 35 |
| Petroleum | Montana | 1 | 187 | 1,002 |
| Banner | Nebraska | 2 | 182 | 39 |
| County 10039 | 10 | 4 | 167 | 205 |
| Trujillo Alto Municipio | Puerto Rico | 2 | 157 | 1,463 |
| Thurston | Nebraska | 1 | 156 | 111 |
| County 10025 | 10 | 1 | 155 | 407 |
| Canovanas Municipio | Puerto Rico | 1 | 150 | 1,064 |
| Boone | West Virginia | 3 | 140 | 279 |
| Slope | North Dakota | 1 | 136 | 48 |
| Buffalo | South Dakota | 1 | 130 | 5 |
| Blaine | Nebraska | 1 | 103 | 49 |
| County 06017 | 06 | 1 | 100 | 10 |
| Monroe | Florida | 2 | 75 | 73 |
| County 05125 | 05 | 1 | 50 | 0 |
| County 04075 | 04 | 1 | 25 | 0 |
| County PA135 | Pennsylvania | 1 | 25 | 18 |
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