| State | Public water systems |
|---|---|
| Texas | 1,133 |
| California | 523 |
| Illinois | 408 |
| Alabama | 294 |
| Florida | 286 |
| Michigan | 284 |
| Tennessee | 276 |
| New York | 266 |
| Pennsylvania | 259 |
| Massachusetts | 254 |
| Ohio | 243 |
| Georgia | 242 |
| North Carolina | 237 |
| Washington | 211 |
| New Jersey | 205 |
| Missouri | 200 |
| Kentucky | 190 |
| Louisiana | 190 |
| Minnesota | 185 |
| Wisconsin | 185 |
| Indiana | 176 |
| Colorado | 167 |
| Arkansas | 157 |
| South Carolina | 143 |
| Oklahoma | 142 |
| Virginia | 142 |
| Utah | 116 |
| Iowa | 112 |
| Oregon | 111 |
| Mississippi | 107 |
| Kansas | 88 |
| West Virginia | 82 |
| Maryland | 69 |
| Arizona | 63 |
| New Mexico | 53 |
| Idaho | 43 |
| Nebraska | 43 |
| New Hampshire | 38 |
| Hawaii | 34 |
| Montana | 32 |
| Vermont | 32 |
| Maine | 31 |
| South Dakota | 31 |
| Connecticut | 30 |
| Nevada | 28 |
| Wyoming | 28 |
| Rhode Island | 26 |
| Delaware | 20 |
| North Dakota | 18 |
| Alaska | 16 |
| District of Columbia | 3 |
Source: U.S. Environmental Protection Agency, Safe Drinking Water Information System (SDWIS/Fed), community water systems. Data captured October 2, 2026.
Largest public water systems
| Public water system | State | Population served |
|---|---|---|
| NEW YORK CITY SYSTEM | NY | 8,271,000 |
| LOS ANGELES-CITY, DEPT. OF WATER & POWER | CA | 3,875,566 |
| CITY OF HOUSTON | TX | 2,970,543 |
| CHICAGO | IL | 2,721,308 |
| SAN ANTONIO WATER SYSTEM | TX | 2,643,729 |
| MWRA | MA | 2,580,000 |
| MDWASA - MAIN SYSTEM | FL | 2,377,460 |
| WASHINGTON SUBURBAN SANITARY COMMISSION | MD | 1,900,000 |
| PHOENIX CITY OF | AZ | 1,695,000 |
| CITY OF BALTIMORE | MD | 1,600,000 |
Source: U.S. Environmental Protection Agency, Safe Drinking Water Information System (SDWIS/Fed), community water systems. Data captured October 2, 2026.