States ranked by number of public water systems
Active systems in EPA SDWIS records. Wisconsin leads with 11,053 active systems.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
| # | State | Active systems | Community systems | Population served |
|---|---|---|---|---|
| 1 | Wisconsin | 11,053 | 1,053 | 5.2M |
| 2 | Michigan | 10,597 | 1,331 | 9M |
| 3 | New York | 8,164 | 2,277 | 19.6M |
| 4 | California | 7,892 | 3,008 | 46.6M |
| 5 | Pennsylvania | 7,243 | 1,762 | 12.6M |
| 6 | Texas | 7,076 | 4,593 | 33.2M |
| 7 | Minnesota | 6,534 | 984 | 5.3M |
| 8 | North Carolina | 5,325 | 2,034 | 9.9M |
| 9 | Florida | 5,199 | 1,640 | 22.5M |
| 10 | Washington | 4,705 | 2,392 | 10.1M |
| 11 | Illinois | 4,585 | 1,794 | 12.6M |
| 12 | Ohio | 4,028 | 1,070 | 11.1M |
| 13 | Indiana | 3,975 | 774 | 5.8M |
| 14 | New Jersey | 3,505 | 582 | 9.6M |
| 15 | Maryland | 3,074 | 442 | 6M |
| 16 | Missouri | 2,938 | 1,607 | 6M |
| 17 | Virginia | 2,733 | 1,043 | 7.9M |
| 18 | Oregon | 2,527 | 938 | 4M |
| 19 | New Hampshire | 2,443 | 706 | 1.2M |
| 20 | Montana | 2,382 | 847 | 1.2M |
| 21 | Georgia | 2,370 | 1,723 | 10.7M |
| 22 | Connecticut | 2,362 | 482 | 2.9M |
| 23 | Colorado | 2,209 | 1,072 | 7.5M |
| 24 | Idaho | 1,950 | 767 | 1.8M |
| 25 | Maine | 1,866 | 385 | 937.4K |
| 26 | Iowa | 1,824 | 1,083 | 3.1M |
| 27 | Arizona | 1,771 | 939 | 7.7M |
| 28 | Massachusetts | 1,631 | 529 | 10.3M |
| 29 | South Carolina | 1,392 | 568 | 4.8M |
| 30 | Tennessee | 1,390 | 448 | 8M |
| 31 | Vermont | 1,356 | 404 | 646.2K |
| 32 | Nebraska | 1,328 | 597 | 1.8M |
| 33 | Alaska | 1,321 | 405 | 864.3K |
| 34 | Oklahoma | 1,276 | 882 | 3.7M |
| 35 | New Mexico | 1,189 | 647 | 2.2M |
| 36 | Mississippi | 1,181 | 988 | 3.3M |
| 37 | Utah | 1,139 | 544 | 3.9M |
| 38 | Louisiana | 1,124 | 819 | 5.2M |
| 39 | Kansas | 1,034 | 864 | 2.9M |
| 40 | Arkansas | 865 | 666 | 3.1M |
| 41 | West Virginia | 801 | 431 | 1.6M |
| 42 | Wyoming | 776 | 332 | 649.9K |
| 43 | South Dakota | 706 | 510 | 967K |
| 44 | Nevada | 649 | 225 | 3.5M |
| 45 | Alabama | 579 | 505 | 6.3M |
| 46 | Delaware | 494 | 220 | 1.1M |
| 47 | Rhode Island | 465 | 89 | 1.2M |
| 48 | Kentucky | 437 | 372 | 5.1M |
| 49 | North Dakota | 403 | 317 | 751.1K |
| 50 | Hawaii | 137 | 119 | 1.5M |
| 51 | District of Columbia | 14 | 4 | 696.5K |