Browse by state
Drinking water systems by state
Each state page lists its counties and the community water systems that serve them, with each system's health-based violations from the last 10 years of EPA records. County pages go on to the cities and towns.
States and territories
56 listed| State | Community water systems | People served | With a health-based violation, 10 years | With one unresolved |
|---|---|---|---|---|
| Alabama | 502 | 6,299,246 | 77 (15%) | 67 |
| Alaska | 407 | 702,746 | 250 (61%) | 141 |
| American Samoa | 10 | 48,601 | 6 (60%) | 3 |
| Arizona | 921 | 7,382,931 | 424 (46%) | 411 |
| Arkansas | 664 | 3,050,790 | 221 (33%) | 122 |
| California | 2,931 | 44,167,025 | 942 (32%) | 633 |
| Colorado | 1,058 | 7,187,560 | 379 (36%) | 198 |
| Connecticut | 476 | 2,753,022 | 188 (39%) | 183 |
| Delaware | 207 | 1,022,142 | 28 (14%) | 34 |
| District of Columbia | 4 | 667,325 | 2 (50%) | 1 |
| Florida | 1,596 | 22,022,996 | 344 (22%) | 849 |
| Georgia | 1,742 | 10,595,212 | 160 (9%) | 475 |
| Guam | 5 | 186,886 | 3 (60%) | 0 |
| Hawaii | 118 | 1,507,181 | 5 (4%) | 8 |
| Idaho | 777 | 1,572,203 | 257 (33%) | 344 |
| Illinois | 1,788 | 12,123,368 | 404 (23%) | 644 |
| Indiana | 770 | 5,230,262 | 209 (27%) | 214 |
| Iowa | 1,079 | 3,011,102 | 95 (9%) | 107 |
| Kansas | 859 | 2,872,812 | 283 (33%) | 360 |
| Kentucky | 375 | 5,055,284 | 171 (46%) | 29 |
| Louisiana | 911 | 5,227,096 | 563 (62%) | 333 |
| Maine | 385 | 691,451 | 90 (23%) | 121 |
| Maryland | 463 | 5,529,402 | 158 (34%) | 38 |
| Massachusetts | 527 | 10,050,818 | 106 (20%) | 32 |
| Michigan | 1,392 | 7,459,127 | 299 (21%) | 172 |
| Minnesota | 997 | 4,732,439 | 102 (10%) | 57 |
| Mississippi | 1,016 | 3,222,348 | 300 (30%) | 111 |
| Missouri | 1,431 | 5,654,367 | 332 (23%) | 356 |
| Montana | 848 | 822,886 | 167 (20%) | 100 |
| Nebraska | 593 | 1,714,128 | 134 (23%) | 83 |
| Nevada | 219 | 3,135,244 | 90 (41%) | 47 |
| New Hampshire | 706 | 907,476 | 220 (31%) | 46 |
| New Jersey | 555 | 8,893,633 | 166 (30%) | 231 |
| New Mexico | 660 | 2,089,733 | 447 (68%) | 312 |
| New York | 2,249 | 18,550,901 | 339 (15%) | 386 |
| North Carolina | 1,986 | 9,582,190 | 478 (24%) | 81 |
| North Dakota | 320 | 743,318 | 36 (11%) | 65 |
| Northern Mariana Islands | 36 | 63,952 | 12 (33%) | 10 |
| Ohio | 1,127 | 10,455,228 | 274 (24%) | 810 |
| Oklahoma | 900 | 3,673,659 | 668 (74%) | 316 |
| Oregon | 946 | 3,754,183 | 322 (34%) | 254 |
| Pennsylvania | 1,851 | 11,469,806 | 752 (41%) | 441 |
| Puerto Rico | 401 | 3,277,432 | 315 (79%) | 239 |
| Rhode Island | 89 | 1,060,624 | 28 (31%) | 7 |
| South Carolina | 563 | 4,688,299 | 95 (17%) | 87 |
| South Dakota | 508 | 926,761 | 178 (35%) | 33 |
| Tennessee | 447 | 7,856,931 | 97 (22%) | 204 |
| Texas | 4,742 | 32,507,687 | 1,765 (37%) | 1,859 |
| U.S. Virgin Islands | 77 | 82,463 | 64 (83%) | 44 |
| Utah | 521 | 3,711,993 | 217 (42%) | 100 |
| Vermont | 404 | 465,317 | 77 (19%) | 115 |
| Virginia | 1,059 | 7,445,350 | 150 (14%) | 66 |
| Washington | 2,377 | 9,469,178 | 254 (11%) | 172 |
| West Virginia | 417 | 1,550,599 | 248 (59%) | 313 |
| Wisconsin | 1,050 | 4,263,550 | 380 (36%) | 321 |
| Wyoming | 327 | 545,539 | 116 (35%) | 64 |
A system that serves more than one state is counted in each. People served is the sum of each system's own figure.
Tribal systems with no county on record
9 systemsEPA or the Navajo Nation regulates these systems. They have no EPA service area map, and their mailing address does not reliably place them in a county: it matches no county, or it is an office shared by many systems.
| System | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|
| Alabama Coushatta #1 (Eastside) | 4,104 | Groundwater | 1 | 0 | 0 |
| Cattaraugus CWS | 4,999 | Purchased surface water | 0 | 0 | 0 |
| Jimmersontown WS | 296 | Groundwater | 0 | 0 | 0 |
| Mohegan Tribal Utility Authority | 31,961 | Purchased surface water | 1 | 0 | 0 |
| Shelton Trailer Park | 40 | Groundwater | 0 | 3 | No inventory |
| Steamburg WS | 288 | Groundwater | 0 | 0 | 0 |
| Sullivan Hollow | 64 | Groundwater | 2 | 0 | 0 |
| Village of Thurston | 120 | Groundwater | 0 | 0 | No inventory |
| Village of Walthill | 780 | Groundwater | 0 | 0 | No inventory |