National directory
Water quality, state by state
49,279
Water systems
19,267
Cities
56
States & territories
Alabama545 systems · 357 cities › Alaska405 systems · 187 cities › Arizona954 systems · 194 cities › Arkansas666 systems · 401 cities › California3,071 systems · 911 cities › Colorado1,113 systems · 313 cities › Connecticut504 systems · 151 cities › Delaware209 systems · 40 cities › Florida1,516 systems · 443 cities › Georgia1,718 systems · 480 cities › Hawaii117 systems · 34 cities › Idaho774 systems · 216 cities › Illinois1,785 systems · 1,043 cities › Indiana718 systems · 425 cities › Iowa1,078 systems · 602 cities › Kansas856 systems · 553 cities › Kentucky375 systems · 254 cities › Louisiana819 systems · 329 cities › Maine359 systems · 186 cities › Maryland467 systems · 155 cities › Massachusetts559 systems · 344 cities › Michigan1,429 systems · 601 cities › Minnesota995 systems · 727 cities › Mississippi990 systems · 359 cities › Missouri1,679 systems · 681 cities › Montana813 systems · 218 cities › Nebraska594 systems · 449 cities › Nevada232 systems · 68 cities › New Hampshire677 systems · 180 cities › New Jersey620 systems · 338 cities › New Mexico592 systems · 254 cities › New York2,202 systems · 844 cities › North Carolina1,963 systems · 458 cities › North Dakota318 systems · 235 cities › Ohio1,130 systems · 597 cities › Oklahoma884 systems · 488 cities › Oregon941 systems · 287 cities › Pennsylvania1,782 systems · 776 cities › Rhode Island93 systems · 41 cities › South Carolina557 systems · 204 cities › South Dakota513 systems · 231 cities › Tennessee453 systems · 285 cities › Texas4,617 systems · 1,239 cities › Utah560 systems · 260 cities › Vermont377 systems · 178 cities › Virginia1,052 systems · 310 cities › Washington2,403 systems · 367 cities › West Virginia430 systems · 209 cities › Wisconsin977 systems · 564 cities › Wyoming317 systems · 115 cities › District of Columbia12 systems · 1 cities › Puerto Rico401 systems · 70 cities › Guam4 systems · 2 cities › U.S. Virgin Islands18 systems · 8 cities › American Samoa10 systems · 1 cities › Northern Mariana Islands36 systems · 4 cities ›