State drinking water records
Texas drinking water systems
4,742 community water systems serve Texas and are listed below under 254 counties and on the pages of 1,714 cities and towns. Their own population figures add up to 32,507,687 people, a sum that counts people twice where one system sells water to another.
1,765 of them (37%) had at least one health-based violation in the last 10 years. 1,859 systems still have one unresolved.
3,388 rely mainly on groundwater and 1,353 on surface water, counting water bought from other systems.
4,264 systems filed a lead service line inventory listing 4,623 lead lines, 108,661 galvanized lines that must be replaced and 2,216,151 lines of unknown material.
262 systems are placed by mailing address or by the county their records name: EPA has no service area map for 223 of them, and 39 have one that does not line up with their own records.
- Community water systems
- 4,742
- People served, sum of each system's own figure
- 32,507,687
- Systems with a health-based violation, last 10 years
- 1,765
- Systems with one unresolved
- 1,859
- Lead service lines in inventories
- 4,623
Counties
254 countiesEach county counts the systems whose service area map reaches it. Systems placed only by a mailing address are listed on the county pages but not counted here.
| County | Systems | People served | With a health-based violation, 10 years | With one unresolved |
|---|---|---|---|---|
| Anderson County | 26 | 97,059 | 10 | 11 |
| Andrews County | 2 | 14,331 | 2 | 1 |
| Angelina County | 20 | 102,580 | 12 | 14 |
| Aransas County | 9 | 18,752 | 4 | 3 |
| Archer County | 8 | 17,191 | 2 | 0 |
| Armstrong County | 2 | 1,450 | 1 | 1 |
| Atascosa County | 8 | 45,000 | 3 | 4 |
| Austin County | 21 | 20,458 | 8 | 12 |
| Bailey County | 2 | 5,188 | 1 | 1 |
| Bandera County | 24 | 15,479 | 5 | 10 |
| Bastrop County | 14 | 129,322 | 6 | 4 |
| Baylor County | 2 | 5,414 | 0 | 0 |
| Bee County | 7 | 21,211 | 5 | 3 |
| Bell County | 31 | 626,058 | 14 | 13 |
| Bexar County | 40 | 2,394,486 | 14 | 13 |
| Blanco County | 7 | 8,046 | 3 | 4 |
| Borden County | 1 | 275 | 1 | 0 |
| Bosque County | 28 | 24,377 | 6 | 11 |
| Bowie County | 18 | 95,239 | 5 | 14 |
| Brazoria County | 153 | 373,112 | 61 | 62 |
| Brazos County | 11 | 294,340 | 5 | 4 |
| Brewster County | 5 | 8,560 | 2 | 1 |
| Briscoe County | 4 | 1,150 | 4 | 2 |
| Brooks County | 2 | 4,698 | 2 | 2 |
| Brown County | 7 | 46,453 | 4 | 3 |
| Burleson County | 20 | 79,451 | 10 | 8 |
| Burnet County | 41 | 72,055 | 19 | 17 |
| Caldwell County | 9 | 101,513 | 3 | 2 |
| Calhoun County | 10 | 21,079 | 8 | 9 |
| Callahan County | 6 | 21,358 | 5 | 4 |
| Cameron County | 20 | 437,276 | 12 | 7 |
| Camp County | 6 | 18,492 | 1 | 3 |
| Carson County | 4 | 4,144 | 2 | 2 |
| Cass County | 15 | 25,603 | 12 | 8 |
| Castro County | 4 | 5,844 | 3 | 3 |
| Chambers County | 27 | 49,799 | 20 | 7 |
| Cherokee County | 28 | 59,688 | 15 | 15 |
| Childress County | 9 | 7,797 | 6 | 2 |
| Clay County | 9 | 10,430 | 5 | 7 |
| Cochran County | 3 | 2,044 | 2 | 1 |
| Coke County | 4 | 2,484 | 2 | 0 |
| Coleman County | 3 | 10,226 | 3 | 2 |
| Collin County | 39 | 1,530,110 | 6 | 12 |
| Collingsworth County | 4 | 2,383 | 3 | 1 |
| Colorado County | 14 | 13,853 | 2 | 6 |
| Comal County | 32 | 229,815 | 11 | 9 |
| Comanche County | 6 | 10,950 | 6 | 4 |
| Concho County | 3 | 6,272 | 2 | 2 |
| Cooke County | 20 | 54,126 | 8 | 6 |
| Coryell County | 14 | 111,592 | 8 | 5 |
| Cottle County | 4 | 1,819 | 4 | 1 |
| Crane County | 1 | 3,150 | 1 | 1 |
| Crockett County | 1 | 3,800 | 0 | 1 |
| Crosby County | 5 | 4,967 | 3 | 5 |
| Culberson County | 2 | 2,098 | 1 | 1 |
| Dallam County | 2 | 8,704 | 1 | 1 |
| Dallas County | 34 | 3,020,837 | 9 | 14 |
| Dawson County | 5 | 11,017 | 4 | 2 |
| DeWitt County | 4 | 17,684 | 1 | 3 |
| Deaf Smith County | 2 | 16,298 | 2 | 0 |
| Delta County | 4 | 6,725 | 1 | 2 |
| Denton County | 90 | 1,218,332 | 14 | 34 |
| Dickens County | 5 | 1,647 | 1 | 2 |
| Dimmit County | 7 | 9,467 | 4 | 6 |
| Donley County | 4 | 2,893 | 1 | 0 |
| Duval County | 6 | 12,404 | 5 | 5 |
| Eastland County | 12 | 20,028 | 12 | 7 |
| Ector County | 7 | 142,802 | 5 | 4 |
| Edwards County | 2 | 2,136 | 1 | 2 |
| El Paso County | 21 | 954,404 | 9 | 8 |
| Ellis County | 35 | 283,759 | 11 | 11 |
| Erath County | 18 | 32,016 | 9 | 7 |
| Falls County | 13 | 29,878 | 7 | 7 |
| Fannin County | 23 | 43,512 | 5 | 11 |
| Fayette County | 10 | 22,296 | 6 | 3 |
| Fisher County | 5 | 7,519 | 5 | 5 |
| Floyd County | 4 | 4,179 | 2 | 3 |
| Foard County | 3 | 1,357 | 3 | 0 |
| Fort Bend County | 159 | 895,540 | 14 | 21 |
| Franklin County | 5 | 22,071 | 2 | 3 |
| Freestone County | 22 | 30,186 | 7 | 8 |
| Frio County | 4 | 14,594 | 2 | 3 |
| Gaines County | 3 | 10,103 | 3 | 3 |
| Galveston County | 23 | 397,601 | 10 | 14 |
| Garza County | 3 | 6,247 | 3 | 2 |
| Gillespie County | 15 | 14,800 | 8 | 5 |
| Glasscock County | 1 | 450 | 0 | 1 |
| Goliad County | 4 | 2,774 | 1 | 4 |
| Gonzales County | 6 | 23,529 | 2 | 4 |
| Gray County | 5 | 20,129 | 2 | 1 |
| Grayson County | 42 | 273,279 | 9 | 17 |
| Gregg County | 16 | 148,241 | 8 | 8 |
| Grimes County | 19 | 23,933 | 10 | 8 |
| Guadalupe County | 14 | 334,766 | 9 | 5 |
| Hale County | 12 | 29,337 | 8 | 10 |
| Hall County | 8 | 3,448 | 6 | 3 |
| Hamilton County | 4 | 8,331 | 2 | 2 |
| Hansford County | 3 | 4,402 | 1 | 2 |
| Hardeman County | 8 | 4,173 | 4 | 3 |
| Hardin County | 21 | 62,661 | 6 | 7 |
| Harris County | 668 | 5,926,426 | 122 | 149 |
| Harrison County | 28 | 83,290 | 18 | 16 |
| Hartley County | 3 | 8,896 | 1 | 2 |
| Haskell County | 9 | 5,495 | 6 | 6 |
| Hays County | 52 | 329,848 | 13 | 20 |
| Hemphill County | 1 | 2,300 | 0 | 0 |
| Henderson County | 63 | 145,017 | 28 | 32 |
| Hidalgo County | 24 | 903,410 | 11 | 12 |
| Hill County | 41 | 60,923 | 16 | 18 |
| Hockley County | 7 | 16,183 | 6 | 5 |
| Hood County | 51 | 66,436 | 10 | 15 |
| Hopkins County | 14 | 45,340 | 5 | 6 |
| Houston County | 10 | 31,880 | 6 | 2 |
| Howard County | 3 | 31,062 | 3 | 2 |
| Hudspeth County | 5 | 5,014 | 4 | 4 |
| Hunt County | 32 | 146,111 | 11 | 14 |
| Hutchinson County | 7 | 22,160 | 3 | 7 |
| Irion County | 2 | 931 | 1 | 1 |
| Jack County | 3 | 5,274 | 3 | 2 |
| Jackson County | 11 | 12,350 | 4 | 9 |
| Jasper County | 18 | 31,263 | 9 | 14 |
| Jeff Davis County | 4 | 1,654 | 2 | 2 |
| Jefferson County | 18 | 259,998 | 10 | 5 |
| Jim Hogg County | 1 | 5,397 | 1 | 1 |
| Jim Wells County | 7 | 25,117 | 5 | 6 |
| Johnson County | 58 | 256,144 | 19 | 22 |
| Jones County | 6 | 17,313 | 3 | 4 |
| Karnes County | 5 | 19,007 | 5 | 2 |
| Kaufman County | 28 | 203,294 | 13 | 12 |
| Kendall County | 17 | 46,577 | 7 | 5 |
| Kenedy County | 2 | 256 | 1 | 1 |
| Kent County | 2 | 738 | 2 | 2 |
| Kerr County | 73 | 50,644 | 24 | 30 |
| Kimble County | 2 | 2,793 | 2 | 1 |
| King County | 2 | 369 | 2 | 1 |
| Kinney County | 3 | 3,620 | 0 | 3 |
| Kleberg County | 8 | 32,603 | 2 | 4 |
| Knox County | 7 | 3,417 | 5 | 3 |
| La Salle County | 4 | 7,287 | 3 | 4 |
| Lamar County | 9 | 59,149 | 6 | 5 |
| Lamb County | 8 | 11,432 | 5 | 4 |
| Lampasas County | 4 | 28,676 | 4 | 2 |
| Lavaca County | 4 | 11,532 | 1 | 2 |
| Lee County | 6 | 26,250 | 4 | 5 |
| Leon County | 15 | 21,541 | 10 | 10 |
| Liberty County | 61 | 92,090 | 11 | 22 |
| Limestone County | 21 | 28,999 | 12 | 12 |
| Lipscomb County | 4 | 2,554 | 2 | 2 |
| Live Oak County | 7 | 15,000 | 2 | 1 |
| Llano County | 19 | 36,966 | 10 | 10 |
| Loving County | 1 | 165 | 1 | 0 |
| Lubbock County | 31 | 305,118 | 24 | 22 |
| Lynn County | 5 | 4,629 | 4 | 4 |
| Madison County | 8 | 13,528 | 2 | 2 |
| Marion County | 10 | 15,752 | 9 | 8 |
| Martin County | 3 | 2,956 | 3 | 3 |
| Mason County | 1 | 2,228 | 1 | 1 |
| Matagorda County | 25 | 36,401 | 11 | 13 |
| Maverick County | 2 | 56,600 | 1 | 1 |
| McCulloch County | 7 | 8,826 | 7 | 5 |
| McLennan County | 58 | 290,509 | 19 | 25 |
| McMullen County | 3 | 5,346 | 2 | 3 |
| Medina County | 29 | 75,224 | 9 | 7 |
| Menard County | 1 | 1,471 | 1 | 0 |
| Midland County | 13 | 166,705 | 11 | 6 |
| Milam County | 12 | 40,216 | 7 | 6 |
| Mills County | 3 | 2,114 | 2 | 2 |
| Mitchell County | 4 | 8,328 | 2 | 3 |
| Montague County | 10 | 12,720 | 6 | 2 |
| Montgomery County | 289 | 723,707 | 81 | 99 |
| Moore County | 5 | 19,451 | 3 | 2 |
| Morris County | 6 | 11,124 | 2 | 4 |
| Motley County | 4 | 1,047 | 3 | 0 |
| Nacogdoches County | 15 | 82,256 | 10 | 6 |
| Navarro County | 23 | 68,782 | 10 | 11 |
| Newton County | 8 | 11,315 | 4 | 4 |
| Nolan County | 5 | 17,238 | 3 | 4 |
| Nueces County | 12 | 368,683 | 9 | 5 |
| Ochiltree County | 3 | 8,652 | 3 | 2 |
| Oldham County | 4 | 1,734 | 1 | 3 |
| Orange County | 29 | 73,657 | 13 | 11 |
| Palo Pinto County | 13 | 40,566 | 13 | 9 |
| Panola County | 21 | 28,454 | 16 | 14 |
| Parker County | 69 | 146,477 | 29 | 33 |
| Parmer County | 4 | 8,055 | 2 | 3 |
| Pecos County | 5 | 14,133 | 4 | 3 |
| Polk County | 59 | 66,174 | 26 | 21 |
| Potter County | 4 | 201,828 | 1 | 2 |
| Presidio County | 5 | 7,554 | 4 | 4 |
| Rains County | 8 | 23,907 | 5 | 6 |
| Randall County | 16 | 221,163 | 9 | 11 |
| Reagan County | 2 | 2,965 | 1 | 1 |
| Real County | 9 | 4,599 | 2 | 4 |
| Red River County | 8 | 17,157 | 5 | 7 |
| Reeves County | 4 | 15,412 | 2 | 3 |
| Refugio County | 5 | 5,098 | 2 | 3 |
| Roberts County | 1 | 494 | 0 | 0 |
| Robertson County | 11 | 40,255 | 1 | 6 |
| Rockwall County | 8 | 134,275 | 3 | 3 |
| Runnels County | 5 | 10,357 | 5 | 4 |
| Rusk County | 38 | 81,617 | 23 | 18 |
| Sabine County | 10 | 19,005 | 6 | 5 |
| San Augustine County | 15 | 7,790 | 10 | 6 |
| San Jacinto County | 31 | 31,887 | 14 | 8 |
| San Patricio County | 14 | 67,844 | 10 | 8 |
| San Saba County | 5 | 6,874 | 2 | 2 |
| Schleicher County | 1 | 1,951 | 0 | 1 |
| Scurry County | 4 | 12,654 | 1 | 1 |
| Shackelford County | 3 | 5,389 | 2 | 1 |
| Shelby County | 20 | 27,532 | 14 | 11 |
| Sherman County | 3 | 2,322 | 1 | 1 |
| Smith County | 39 | 281,095 | 18 | 22 |
| Somervell County | 6 | 7,178 | 2 | 2 |
| Starr County | 8 | 65,879 | 7 | 6 |
| Stephens County | 2 | 10,616 | 1 | 0 |
| Sterling County | 1 | 888 | 0 | 0 |
| Stonewall County | 3 | 956 | 3 | 2 |
| Sutton County | 1 | 2,766 | 1 | 1 |
| Swisher County | 4 | 6,282 | 3 | 4 |
| Tarrant County | 78 | 2,340,535 | 19 | 23 |
| Taylor County | 14 | 166,512 | 10 | 4 |
| Terrell County | 1 | 800 | 1 | 1 |
| Terry County | 3 | 9,444 | 3 | 3 |
| Throckmorton County | 2 | 4,028 | 2 | 1 |
| Titus County | 6 | 37,412 | 0 | 3 |
| Tom Green County | 18 | 127,598 | 14 | 12 |
| Travis County | 89 | 1,642,192 | 27 | 35 |
| Trinity County | 17 | 20,973 | 14 | 9 |
| Tyler County | 19 | 23,386 | 10 | 16 |
| Upshur County | 16 | 68,002 | 6 | 9 |
| Upton County | 3 | 2,731 | 3 | 2 |
| Uvalde County | 10 | 26,352 | 4 | 3 |
| Val Verde County | 14 | 44,099 | 7 | 9 |
| Van Zandt County | 25 | 72,066 | 4 | 6 |
| Victoria County | 12 | 73,688 | 9 | 7 |
| Walker County | 24 | 72,526 | 14 | 9 |
| Waller County | 32 | 77,278 | 13 | 8 |
| Ward County | 6 | 11,150 | 1 | 4 |
| Washington County | 10 | 25,957 | 6 | 6 |
| Webb County | 7 | 273,041 | 6 | 5 |
| Wharton County | 13 | 26,858 | 4 | 10 |
| Wheeler County | 4 | 4,162 | 3 | 3 |
| Wichita County | 9 | 151,116 | 2 | 5 |
| Wilbarger County | 8 | 12,769 | 8 | 2 |
| Willacy County | 5 | 187,588 | 3 | 5 |
| Williamson County | 39 | 741,682 | 8 | 12 |
| Wilson County | 16 | 57,573 | 4 | 8 |
| Winkler County | 3 | 14,500 | 2 | 2 |
| Wise County | 42 | 73,228 | 14 | 19 |
| Wood County | 20 | 68,896 | 4 | 9 |
| Yoakum County | 2 | 6,855 | 1 | 1 |
| Young County | 6 | 21,300 | 4 | 4 |
| Zapata County | 4 | 17,075 | 4 | 2 |
| Zavala County | 4 | 11,003 | 1 | 3 |
Largest systems
| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| City of Houston | Harris County | 2,970,543 | Surface water | 1 | 0 | 0 |
| San Antonio Water System | Bexar County | 2,113,151 | Purchased surface water | 0 | 0 | 0 |
| Dallas Water Utility | Dallas County | 1,356,479 | Surface water | 0 | 0 | 0 |
| City of Austin Water & Wastewater | Travis County | 1,115,323 | Surface water | 5 | 0 | 0 |
| City of Fort Worth | Tarrant County | 955,900 | Surface water | 1 | 0 | 0 |
| El Paso Water Utilities Public Service B | El Paso County | 747,168 | Surface water | 0 | 0 | 0 |
| City of Arlington | Tarrant County | 413,955 | Surface water | 0 | 0 | 0 |
| City of Corpus Christi | Nueces County | 318,387 | Surface water | 2 | 0 | 0 |
| City of Plano | Collin County | 292,059 | Purchased surface water | 0 | 0 | 0 |
| Lubbock Public Water System | Lubbock County | 275,041 | Surface water | 0 | 0 | 0 |
| City of Irving | Dallas County | 264,546 | Purchased surface water | 0 | 0 | 0 |
| City of Laredo | Webb County | 260,046 | Surface water | 5 | 0 | 0 |
| City of Garland | Dallas County | 248,822 | Purchased surface water | 0 | 0 | 0 |
| City of Frisco | Collin County and 1 other county | 231,910 | Purchased surface water | 0 | 0 | 0 |
| City of McKinney | Collin County | 224,043 | Purchased surface water | 0 | 0 | 0 |
Systems with unresolved health-based violations
1859 systemsThe 100 with the most unresolved violations are listed. The county pages list the other 1759.
| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| Lee Limas Mobile Home Park | El Paso County | 39 | Groundwater | 1 | 243 | No inventory |
| Leroys Mobile Home Park | Bowie County | 60 | Groundwater | 1 | 214 | No inventory |
| Moores Water System | McLennan County | 285 | Purchased groundwater | 6 | 110 | No inventory |
| Country View MHP | Lubbock County | 54 | Groundwater | 111 | 110 | No inventory |
| Valley Estates | Lubbock County | 68 | Groundwater | 148 | 104 | No inventory |
| Key Road Subdivision Water System | Victoria County | 54 | Purchased groundwater | 3 | 71 | No inventory |
| Nico Tyme Water Coop | Bexar County | 96 | Groundwater | 4 | 68 | No inventory |
| Catalpa Villa | Randall County | 114 | Groundwater | 1 | 64 | No inventory |
| Skywater WSC | Castro County | 140 | Groundwater | 2 | 57 | No inventory |
| Denton Estates Mobile Home Park | Denton County | 156 | Groundwater | 2 | 46 | No inventory |
| Rockwell Acres Water System | Randall County | 250 | Groundwater | 4 | 44 | No inventory |
| Warren Road Subdivision Water Supply | Midland County | 195 | Groundwater | 24 | 44 | No inventory |
| Houston Suburban Heights MHP | Harris County | 60 | Groundwater | 5 | 44 | No inventory |
| Los Botines WSC | Webb County | 54 | Groundwater | 0 | 41 | 0 |
| Eola WSC | Concho County | 165 | Groundwater | 39 | 39 | No inventory |
| Seaport Lakes Subdivision | Calhoun County | 42 | Groundwater | 17 | 39 | No inventory |
| Woodland Shores Subdivision | Shelby County | 75 | Groundwater | 1 | 38 | 0 |
| Whispering Pines Lake Water | Walker County | 108 | Groundwater | 1 | 33 | No inventory |
| City of Forsan | Howard County | 228 | Groundwater | 1 | 32 | No inventory |
| Silverwoods Subdivision | Harris County | 90 | Groundwater | 1 | 31 | No inventory |
| Rolling Hills Water Supply | McLennan County | 186 | Groundwater | 1 | 28 | No inventory |
| South Midland County Water System | Midland County | 165 | Groundwater | 59 | 28 | No inventory |
| Cypress Brook Estates | Harris County | 81 | Groundwater | 3 | 27 | No inventory |
| Stormlight Mobile Home Park | Lubbock County | 76 | Groundwater | 150 | 26 | 0 |
| Grassland WSC | Lynn County | 55 | Groundwater | 120 | 26 | No inventory |
| Loma Linda Water Supply | Jim Wells County | 216 | Groundwater | 1 | 25 | No inventory |
| Cuney Rural Water Supply | Cherokee County | 115 | Groundwater | 3 | 25 | No inventory |
| Cotton Center WSC | Hale County | 250 | Groundwater | 4 | 24 | No inventory |
| Tara Park Water System | Waller County | 113 | Groundwater | 1 | 24 | No inventory |
| Lakeside Estates Subdivision | Waller County | 378 | Groundwater | 2 | 23 | No inventory |
| Lakeside Water Supply 1 | Tyler County | 132 | Groundwater | 4 | 23 | No inventory |
| City of La Grulla | Starr County | 9,500 | Surface water | 12 | 22 | No inventory |
| City of Douglassville | Cass County | 211 | Groundwater | 1 | 22 | No inventory |
| Frost Mobile Home Park | Matagorda County | 84 | Groundwater | 1 | 22 | No inventory |
| Oaks Mobile Home Park | Blanco County | 75 | Groundwater | 1 | 22 | No inventory |
| Little Big Horn Services | Hardin County | 65 | Groundwater | 1 | 22 | No inventory |
| City of Dayton Lakes | Liberty County | 36 | Groundwater | 1 | 22 | No inventory |
| Woodland Estates | Bowie County | 165 | Groundwater | 1 | 21 | No inventory |
| Hamilton Estates Water System | Harris County | 123 | Groundwater | 2 | 21 | No inventory |
| Green Lake Estates Water Supply | Limestone County | 66 | Groundwater | 2 | 20 | No inventory |
| 114th Street Mobile Home Park | Lubbock County | 42 | Groundwater | 38 | 20 | No inventory |
| Maple WSC | Bailey County | 30 | Groundwater | 1 | 20 | No inventory |
| City of Gladewater | Gregg County and 1 other county | 6,441 | Surface water | 25 | 19 | No inventory |
| American Legion Mia Post 231 | Grayson County | 141 | Purchased surface water | 1 | 19 | No inventory |
| T L Water Jones Acres | Wise County | 120 | Groundwater | 1 | 19 | 0 |
| Carol Norra Mobile Home Park | Harris County | 63 | Groundwater | 1 | 19 | No inventory |
| Margies MHP | Midland County | 60 | Groundwater | 29 | 19 | No inventory |
| SLC WSC | Limestone County | 1,749 | Surface water | 33 | 17 | No inventory |
| Tom Green County FWSD 2 Christoval | Tom Green County | 482 | Groundwater under direct influence | 0 | 17 | 0 |
| Nigton Wakefield WSC | Trinity County | 352 | Groundwater | 18 | 17 | No inventory |
| Slidell WSC | Wise County | 192 | Groundwater | 1 | 17 | No inventory |
| Shelby Water | Shelby County | 61 | Groundwater | 2 | 17 | No inventory |
| Pine Colony Mobile Home Park | Brazoria County | 450 | Groundwater | 1 | 16 | No inventory |
| City of Opdyke West | Hockley County | 220 | Groundwater | 47 | 15 | No inventory |
| Seven Estates | Lubbock County | 189 | Groundwater | 99 | 15 | 0 |
| Whispering Oaks Water Coop | Hunt County | 141 | Groundwater | 1 | 15 | No inventory |
| Lakeside Water Supply 2 | Tyler County | 84 | Groundwater | 1 | 15 | No inventory |
| Deer Run and White Rock City Marina | Trinity County | 226 | Purchased surface water | 1 | 14 | No inventory |
| South Haven | Hale County | 108 | Groundwater | 1 | 14 | No inventory |
| City of Toyah | Reeves County | 89 | Purchased groundwater | 14 | 14 | 0 |
| Oak Hill Acres Mobile Home Subdivision | Bexar County | 81 | Groundwater | 1 | 14 | No inventory |
| City of Mart | McLennan County | 1,846 | Surface water | 4 | 13 | 0 |
| Candelaria WSC | Presidio County | 138 | Groundwater | 35 | 13 | No inventory |
| Binford Place Subdivision | Harris County | 120 | Groundwater | 1 | 13 | No inventory |
| Pine Oak Forest Water | Harris County | 105 | Groundwater | 1 | 13 | No inventory |
| Shafter Mine | Presidio County | 32 | Groundwater | 1 | 13 | No inventory |
| City of Rotan | Fisher County | 1,983 | Purchased surface water | 10 | 12 | No inventory |
| Lakeside Water Supply 4 | Tyler County | 123 | Groundwater | 1 | 12 | No inventory |
| Pleasure Point | Angelina County | 110 | Groundwater | 10 | 12 | No inventory |
| English Acres | Jim Wells County | 90 | Groundwater | 3 | 12 | No inventory |
| Suburban Garden Trailer Park | Brazoria County | 63 | Groundwater | 1 | 12 | No inventory |
| Caro WSC | Nacogdoches County | 2,412 | Groundwater | 1 | 11 | No inventory |
| Woodlake Josserand WSC | Trinity County | 903 | Groundwater | 24 | 11 | No inventory |
| P & B Water System | Harris County | 660 | Groundwater | 1 | 11 | No inventory |
| Seaboard WSC | San Patricio County | 420 | Purchased surface water | 1 | 11 | No inventory |
| Big Thicket RV Park | Hardin County | 102 | Groundwater | 3 | 11 | 0 |
| Mullins Mobile Home Park | Denton County | 87 | Groundwater | 1 | 11 | No inventory |
| Rayburn Water Resources | Jasper County | 37 | Groundwater | 0 | 11 | No inventory |
| City of Santa Rosa | Cameron County | 2,883 | Surface water | 5 | 10 | No inventory |
| City of West Tawakoni | Hunt County | 1,931 | Surface water | 1 | 10 | No inventory |
| Ira WSC | Scurry County | 680 | Purchased surface water | 4 | 10 | No inventory |
| Forest WSC | Cherokee County | 651 | Groundwater | 88 | 10 | 0 |
| Town North Village Water System | Lubbock County | 360 | Groundwater | 44 | 10 | No inventory |
| Turkey Municipal Water System | Hall County | 317 | Groundwater | 39 | 10 | No inventory |
| Deys RV and Mobile Park | Andrews County | 222 | Groundwater | 15 | 10 | No inventory |
| City of Mertens | Hill County | 180 | Groundwater | 1 | 10 | No inventory |
| Lakeside Water Supply 5 | Tyler County | 135 | Groundwater | 1 | 10 | No inventory |
| Lakeside Water Supply 3 | Tyler County | 123 | Groundwater | 6 | 10 | No inventory |
| Cox Addition Water System | Lubbock County | 114 | Groundwater | 32 | 10 | No inventory |
| Fall Branch Estates | Kerr County | 60 | Groundwater | 1 | 10 | No inventory |
| A & S Water Services | Montgomery County | 52 | Groundwater | 20 | 10 | 0 |
| Straightway Training Center | Wharton County | 50 | Groundwater | 1 | 10 | No inventory |
| Quail Run Mobile Home Park | El Paso County | 45 | Groundwater | 1 | 10 | No inventory |
| City of Tenaha | Shelby County | 1,746 | Groundwater | 10 | 9 | No inventory |
| Terrell County WCID 1 | Terrell County | 800 | Groundwater | 1 | 9 | No inventory |
| Rosewood Water System | Upshur County | 639 | Groundwater | 0 | 9 | 0 |
| City of Petrolia | Clay County | 514 | Groundwater | 1 | 9 | No inventory |
| Mooreland Water Company | Hood County | 414 | Groundwater | 1 | 9 | No inventory |
| Grand Harbor WSC | Wise County | 360 | Purchased surface water | 47 | 9 | No inventory |
| Texhoma City Municipal Water System | Sherman County | 315 | Groundwater | 1 | 9 | No inventory |
Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations