States ranked by number of public water systems
Active systems in EPA SDWIS records. Wisconsin leads with 11,056 active systems.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
| # | State | Active systems | Community systems | Population served |
|---|---|---|---|---|
| 1 | Wisconsin | 11,056 | 1,053 | 5.2M |
| 2 | Michigan | 10,599 | 1,332 | 9M |
| 3 | New York | 8,167 | 2,281 | 19.4M |
| 4 | California | 7,479 | 2,997 | 42.7M |
| 5 | Pennsylvania | 7,217 | 1,762 | 12.6M |
| 6 | Texas | 7,078 | 4,594 | 33.9M |
| 7 | Minnesota | 6,465 | 987 | 5.3M |
| 8 | Florida | 5,197 | 1,640 | 22.6M |
| 9 | North Carolina | 5,087 | 2,031 | 10M |
| 10 | Washington | 4,705 | 2,392 | 10.2M |
| 11 | Indiana | 3,969 | 770 | 5.8M |
| 12 | Illinois | 3,872 | 1,773 | 12.4M |
| 13 | Ohio | 3,854 | 1,028 | 10.7M |
| 14 | New Jersey | 3,496 | 582 | 9.6M |
| 15 | Maryland | 2,992 | 422 | 5.8M |
| 16 | Missouri | 2,943 | 1,612 | 6M |
| 17 | Oregon | 2,536 | 940 | 4M |
| 18 | New Hampshire | 2,450 | 706 | 1.2M |
| 19 | Virginia | 2,420 | 844 | 7.6M |
| 20 | Montana | 2,378 | 853 | 1.2M |
| 21 | Georgia | 2,375 | 1,724 | 10.7M |
| 22 | Connecticut | 2,363 | 481 | 2.9M |
| 23 | Colorado | 2,207 | 1,068 | 7.5M |
| 24 | Idaho | 1,961 | 765 | 1.8M |
| 25 | Maine | 1,862 | 386 | 937.2K |
| 26 | Iowa | 1,828 | 1,084 | 3.1M |
| 27 | Arizona | 1,769 | 936 | 7.7M |
| 28 | Massachusetts | 1,636 | 531 | 10.3M |
| 29 | South Carolina | 1,392 | 567 | 4.9M |
| 30 | Tennessee | 1,383 | 450 | 8M |
| 31 | Vermont | 1,357 | 405 | 647.1K |
| 32 | Alaska | 1,322 | 406 | 862.9K |
| 33 | Oklahoma | 1,254 | 864 | 3.6M |
| 34 | Nebraska | 1,226 | 599 | 1.8M |
| 35 | New Mexico | 1,165 | 645 | 2.2M |
| 36 | Mississippi | 1,133 | 947 | 3.2M |
| 37 | Utah | 1,133 | 540 | 3.9M |
| 38 | Louisiana | 1,121 | 815 | 5.3M |
| 39 | Kansas | 1,041 | 863 | 2.9M |
| 40 | Arkansas | 853 | 660 | 3.1M |
| 41 | West Virginia | 791 | 427 | 1.6M |
| 42 | Wyoming | 775 | 332 | 649.6K |
| 43 | South Dakota | 699 | 510 | 969.2K |
| 44 | Nevada | 643 | 224 | 3.5M |
| 45 | Alabama | 576 | 505 | 6.4M |
| 46 | Delaware | 494 | 219 | 1.1M |
| 47 | Rhode Island | 465 | 89 | 1.2M |
| 48 | Kentucky | 437 | 371 | 5.1M |
| 49 | North Dakota | 403 | 317 | 751.4K |
| 50 | Hawaii | 136 | 119 | 1.5M |
| 51 | District of Columbia | 12 | 4 | 697.4K |