Drinking water quality by state
Across all 50 states and the District of Columbia, 142,155 active public water systems serve 346.1 million people. 65,678 of them, 46%, had at least one EPA violation in the past three years, 3,008 are designated serious violators, and 4,554 carry a health flag.
Active systems
142,155
48,811 community systems serve 328.3M
People served
346.1M
by public water systems
Violations, past 3 years
65,678
46% of active systems
Serious violators
3,008
4,554 systems carry a health flag
Highest share with violations
Lowest share with violations
Most serious violators
About the data
Each state is refreshed separately from EPA ECHO; the table shows the retrieval date. Counts cover active systems only.
All states and the District of Columbia
Alphabetical| State | Active systems | People served | With violations, 3 yr | Serious violators | Retrieved |
|---|---|---|---|---|---|
| Alabama | 560 | 6,435,302 | 6 | Oct 11, 2026 | |
| Alaska | 1,327 | 864,871 | 100 | Oct 11, 2026 | |
| Arizona | 1,721 | 7,727,107 | 66 | Oct 11, 2026 | |
| Arkansas | 998 | 3,098,019 | 8 | Oct 11, 2026 | |
| California | 7,384 | 42,099,750 | 43 | Oct 11, 2026 | |
| Colorado | 2,218 | 7,501,712 | 33 | Oct 11, 2026 | |
| Connecticut | 2,334 | 2,940,461 | 37 | Oct 11, 2026 | |
| Delaware | 455 | 1,090,175 | 0 | Oct 11, 2026 | |
| District of Columbia | 14 | 672,446 | 5 | Oct 11, 2026 | |
| Florida | 5,116 | 22,557,275 | 402 | Oct 11, 2026 | |
| Georgia | 2,389 | 10,763,783 | 27 | Oct 11, 2026 | |
| Hawaii | 135 | 1,520,488 | 0 | Oct 11, 2026 | |
| Idaho | 2,020 | 1,773,539 | 90 | Oct 11, 2026 | |
| Illinois | 5,097 | 12,553,792 | 180 | Oct 11, 2026 | |
| Indiana | 3,935 | 5,780,720 | 82 | Oct 11, 2026 | |
| Iowa | 1,804 | 3,158,425 | 12 | Oct 11, 2026 | |
| Kansas | 956 | 2,898,931 | 47 | Oct 11, 2026 | |
| Kentucky | 423 | 5,068,252 | 3 | Oct 11, 2026 | |
| Louisiana | 1,216 | 5,335,944 | 119 | Oct 11, 2026 | |
| Maine | 1,869 | 939,177 | 42 | Oct 11, 2026 | |
| Maryland | 3,216 | 6,083,270 | 16 | Oct 11, 2026 | |
| Massachusetts | 1,613 | 11,114,318 | 7 | Oct 11, 2026 | |
| Michigan | 11,156 | 9,130,660 | 131 | Oct 11, 2026 | |
| Minnesota | 6,574 | 5,325,899 | 20 | Oct 11, 2026 | |
| Mississippi | 1,196 | 3,315,491 | 7 | Oct 11, 2026 | |
| Missouri | 2,835 | 5,917,562 | 32 | Oct 11, 2026 | |
| Montana | 2,353 | 1,158,253 | 18 | Oct 11, 2026 | |
| Nebraska | 1,211 | 1,802,940 | 7 | Oct 11, 2026 | |
| Nevada | 610 | 3,470,703 | 32 | Oct 11, 2026 | |
| New Hampshire | 2,451 | 1,243,292 | 18 | Oct 11, 2026 | |
| New Jersey | 3,411 | 9,591,500 | 92 | Oct 11, 2026 | |
| New Mexico | 1,157 | 2,239,605 | 71 | Oct 11, 2026 | |
| New York | 8,076 | 19,320,902 | 47 | Oct 11, 2026 | |
| North Carolina | 5,009 | 10,072,878 | 0 | Oct 11, 2026 | |
| North Dakota | 388 | 743,712 | 1 | Oct 11, 2026 | |
| Ohio | 4,165 | 11,156,658 | 81 | Oct 11, 2026 | |
| Oklahoma | 1,291 | 3,748,166 | 73 | Oct 11, 2026 | |
| Oregon | 2,555 | 4,027,748 | 85 | Oct 11, 2026 | |
| Pennsylvania | 7,658 | 12,627,142 | 148 | Oct 11, 2026 | |
| Rhode Island | 439 | 1,159,616 | 4 | Oct 11, 2026 | |
| South Carolina | 1,406 | 4,851,140 | 2 | Oct 11, 2026 | |
| South Dakota | 703 | 977,514 | 4 | Oct 11, 2026 | |
| Tennessee | 761 | 8,013,651 | 15 | Oct 11, 2026 | |
| Texas | 7,430 | 34,094,513 | 362 | Oct 11, 2026 | |
| Utah | 1,080 | 3,926,190 | 14 | Oct 11, 2026 | |
| Vermont | 1,346 | 645,153 | 16 | Oct 11, 2026 | |
| Virginia | 2,832 | 7,918,738 | 7 | Oct 11, 2026 | |
| Washington | 4,692 | 10,199,609 | 37 | Oct 11, 2026 | |
| West Virginia | 771 | 1,604,208 | 326 | Oct 11, 2026 | |
| Wisconsin | 11,026 | 5,187,482 | 23 | Oct 11, 2026 | |
| Wyoming | 773 | 651,435 | 10 | Oct 11, 2026 |
Share with violations counts any violation in the past three years, including monitoring and reporting lapses, so it reflects how strictly a state reports as much as water quality itself.
under 30% 30 to 59% 60% and over