Houston Water Quality
Texas
Health Violations
According to EPA SDWIS, Houston, Texas is served by 734 community water systems covering about 5,960,800 people. The same extract lists 694 health-based violation records, most recently coded 8000 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
734
Water Systems
5,960,800
Population Served
694
Health-Based Violation Records
17
Distinct Contaminant Codes
Drinking water in Houston, Texas is delivered through 734 EPA-regulated community water systems serving an estimated 5,960,800 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 694 violation records across the 734 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 17 distinct EPA contaminant codes: Revised Total Coliform Rule, Long Term 2 Enhanced Surface Water Treatment Rule, Nitrate, TTHM, Interim Enhanced Surface Water Treatment Rule and 12 others. 251 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Texas drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| CITY OF HOUSTON | 2,970,543 | 2 | Health |
| CLEAR LAKE CITY WATER AUTHORITY | 89,702 | 0 | Clean |
| CITY OF HOUSTON UD 5 - KINGWOOD | 80,073 | 0 | Clean |
| HARRIS COUNTY MUD 165 | 40,503 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 5 | 25,425 | 0 | Clean |
| BRIDGESTONE MUD | 24,528 | 0 | Clean |
| TIMBER LANE UTILITY DISTRICT | 24,507 | 0 | Clean |
| HARRIS COUNTY FWSD 51 | 19,671 | 0 | Clean |
| CIMARRON MUD | 19,338 | 0 | Clean |
| HARRIS COUNTY MUD 82 | 18,990 | 0 | Clean |
| NORTHWEST PARK MUD | 18,168 | 0 | Clean |
| CLEAR BROOK CITY MUD | 18,108 | 0 | Clean |
| HARRIS MONTGOMERY COUNTIES MUD 386 | 18,018 | 0 | Clean |
| HARRIS COUNTY MUD 53 | 17,856 | 0 | Clean |
| HARRIS COUNTY MUD 26 | 17,178 | 0 | Clean |
| HARRIS COUNTY MUD 71 | 17,079 | 0 | Clean |
| FORT BEND COUNTY MUD 30 | 16,794 | 1 | Health |
| HARRIS COUNTY MUD 167 | 16,761 | 0 | Clean |
| HARRIS COUNTY MUD 55 HERITAGE PARK | 16,392 | 0 | Clean |
| HARRIS COUNTY FWSD 61 | 15,400 | 0 | Clean |
| HARRIS COUNTY MUD 105 | 14,925 | 0 | Clean |
| PECAN GROVE MUD | 14,913 | 0 | Clean |
| HARRIS COUNTY MUD 200 CRANBROOK | 14,868 | 0 | Clean |
| HARRIS COUNTY MUD 24 | 14,796 | 3 | Health |
| CNP UTILITY DISTRICT | 14,718 | 0 | Clean |
| HARRIS COUNTY MUD 285 | 14,268 | 0 | Clean |
| CITY OF HOUSTON WILLOW CHASE | 14,169 | 0 | Clean |
| MEADOWHILL REGIONAL MUD | 13,863 | 0 | Clean |
| REMINGTON MUD 1 | 13,746 | 0 | Clean |
| FORT BEND COUNTY MUD 23 | 13,695 | 0 | Clean |
| SOUTHERN MONTGOMERY COUNTY MUD | 13,372 | 0 | Clean |
| HARRIS COUNTY MUD 120 | 13,197 | 0 | Clean |
| NEWPORT MUD | 13,191 | 0 | Clean |
| HARRIS COUNTY MUD 157 | 13,062 | 8 | Health |
| HARRIS COUNTY MUD 1 | 12,342 | 0 | Clean |
| NORTHAMPTON MUD | 12,162 | 0 | Clean |
| HARRIS COUNTY MUD 368 | 11,835 | 0 | Clean |
| HARRIS COUNTY MUD 153 | 11,781 | 0 | Clean |
| FORT BEND COUNTY MUD 142 | 11,595 | 0 | Clean |
| RAYFORD ROAD MUD | 11,550 | 0 | Clean |
| HARRIS COUNTY MUD 81 | 11,514 | 0 | Clean |
| MEMORIAL VILLAGES WATER AUTHORITY | 11,382 | 4 | Health |
| HARRIS COUNTY UD 6 | 11,262 | 0 | Clean |
| HARRIS COUNTY WCID 36 | 11,073 | 0 | Clean |
| CYPRESS HILL MUD 1 | 11,052 | 0 | Clean |
| HARRIS COUNTY MUD 49 | 10,893 | 0 | Clean |
| FORT BEND COUNTY MUD 58 | 10,629 | 0 | Clean |
| HARRIS COUNTY MUD 278 | 10,584 | 0 | Clean |
| HARRIS COUNTY WCID 96 | 10,530 | 0 | Clean |
| GREENWOOD UTILITY DISTRICT | 10,527 | 0 | Clean |
| FORT BEND COUNTY MUD 182 | 10,498 | 0 | Clean |
| HARRIS COUNTY MUD 489 | 10,476 | 0 | Clean |
| HARRIS COUNTY MUD 230 | 10,404 | 0 | Clean |
| HARRIS COUNTY MUD 102 | 10,401 | 0 | Clean |
| LANGHAM CREEK UTILITY DISTRICT | 10,377 | 0 | Clean |
| FORT BEND COUNTY MUD 151 | 10,233 | 0 | Clean |
| MISSION BEND MUD 2 | 10,155 | 4 | Health |
| HARRIS COUNTY WCID 109 | 10,134 | 0 | Clean |
| PONDEROSA FOREST UTILITY DISTRICT | 10,101 | 0 | Clean |
| HARRIS COUNTY WCID 110 | 9,807 | 0 | Clean |
| HARRIS COUNTY MUD 109 | 9,501 | 0 | Clean |
| TRAIL OF THE LAKES MUD | 9,480 | 26 | Health |
| HARRIS COUNTY MUD 188 | 9,453 | 0 | Clean |
| HUNTERS GLEN MUD | 9,405 | 0 | Clean |
| HARRIS-FORT BEND COUNTIES MUD 3 | 9,297 | 0 | Clean |
| HARRIS COUNTY WCID 119 | 9,150 | 0 | Clean |
| NORTH MISSION GLEN MUD | 9,096 | 0 | Clean |
| HARRIS COUNTY WCID 89 | 9,033 | 0 | Clean |
| BARKER CYPRESS MUD | 8,976 | 0 | Clean |
| SUNBELT FWSD HIGH MEADOWS SUBDIVISION | 8,946 | 0 | Clean |
| CHELFORD CITY MUD | 8,917 | 0 | Clean |
| HARRIS COUNTY MUD 391 | 8,835 | 0 | Clean |
| GALVESTON COUNTY WCID 12 | 8,721 | 0 | Clean |
| HARRIS COUNTY MUD 132 | 8,682 | 0 | Clean |
| KINGSBRIDGE MUD | 8,663 | 3 | Health |
| RICE UNIVERSITY | 8,415 | 2 | Health |
| JACKRABBIT ROAD PUD | 8,346 | 0 | Clean |
| HARRIS COUNTY MUD 154 | 8,289 | 0 | Clean |
| HARRIS COUNTY MUD 290 | 8,259 | 0 | Clean |
| WEST HARRIS COUNTY MUD 11 | 8,205 | 0 | Clean |
| BISSONNET MUD | 8,160 | 0 | Clean |
| WEST PARK MUD | 8,106 | 0 | Clean |
| ADDICKS UTILITY DISTRICT | 8,076 | 0 | Clean |
| HARRIS COUNTY MUD 468 | 7,944 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 9 | 7,848 | 0 | Clean |
| SIENNA MUD 10 | 7,824 | 0 | Clean |
| FIRST COLONY MUD 9 | 7,818 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 12 | 7,764 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 10 | 7,671 | 0 | Clean |
| WESTON MUD | 7,647 | 0 | Clean |
| BLUE RIDGE WEST MUD | 7,545 | 12 | Health |
| HARRIS COUNTY MUD 151 | 7,464 | 0 | Clean |
| CY CHAMP PUD | 7,428 | 0 | Clean |
| HARRIS COUNTY MUD 419 | 7,389 | 0 | Clean |
| SIENNA MUD 3 | 7,365 | 0 | Clean |
| FORT BEND COUNTY MUD 133 | 7,362 | 0 | Clean |
| FORT BEND COUNTY MUD 134B | 7,356 | 0 | Clean |
| EMERALD FOREST UTILITY DISTRICT | 7,326 | 0 | Clean |
| PARKWAY UTILITY DISTRICT | 7,323 | 2 | Health |
| HARRIS COUNTY MUD 152 | 7,314 | 0 | Clean |
| FORT BEND COUNTY MUD 134C | 7,260 | 0 | Clean |
| FORT BEND COUNTY MUD 143 WATER VIEW ESTA | 7,245 | 0 | Clean |
| HARRIS COUNTY MUD 504 | 7,242 | 0 | Clean |
| MALCOMSON ROAD UTILITY DISTRICT | 7,231 | 0 | Clean |
| HARRIS COUNTY MUD 449 | 7,179 | 0 | Clean |
| WINDFERN FOREST UTILITY DISTRICT | 7,170 | 1 | Health |
| LAKE FOREST UTILITY DISTRICT | 7,106 | 0 | Clean |
| NOTTINGHAM COUNTRY MUD | 7,089 | 1 | Health |
| HARRIS COUNTY MUD 196 | 7,026 | 2 | Health |
| DOWDELL PUD | 7,002 | 0 | Clean |
| HARRIS COUNTY MUD 96 | 6,993 | 0 | Clean |
| SAGEMEADOW UTILITY DISTRICT | 6,975 | 0 | Clean |
| REID ROAD MUD 1 | 6,969 | 0 | Clean |
| BRAZORIA COUNTY MUD 6 | 6,926 | 0 | Clean |
| WEST HARRIS COUNTY MUD 2 CHASE | 6,921 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 15 | 6,915 | 0 | Clean |
| HARRIS COUNTY MUD 189 | 6,906 | 0 | Clean |
| FORT BEND COUNTY MUD 2 | 6,819 | 0 | Clean |
| SUNBELT FWSD OAKWILDE SUBDIVISION | 6,819 | 0 | Clean |
| HARRIS COUNTY MUD 158 | 6,798 | 0 | Clean |
| HARRIS COUNTY MUD 150 | 6,786 | 0 | Clean |
| HARRIS COUNTY MUD 367 | 6,759 | 0 | Clean |
| HARRIS COUNTY MUD 64 | 6,726 | 0 | Clean |
| FALLBROOK UTILITY DISTRICT | 6,720 | 0 | Clean |
| MILLS ROAD MUD | 6,717 | 0 | Clean |
| NORTH PARK PUD | 6,708 | 0 | Clean |
| WEST HARRIS COUNTY MUD 10 | 6,697 | 4 | Health |
| HARRIS COUNTY MUD 118 | 6,678 | 0 | Clean |
| GRAND MISSION MUD 1 | 6,663 | 0 | Clean |
| HARRIS COUNTY MUD 433 | 6,651 | 0 | Clean |
| MONTGOMERY COUNTY MUD 119 SPRING TRAILS | 6,621 | 0 | Clean |
| HEATHERLOCH MUD | 6,612 | 0 | Clean |
| HORSEPEN BAYOU MUD | 6,597 | 0 | Clean |
| INTERSTATE MUD | 6,591 | 0 | Clean |
| HARRIS COUNTY MUD 354 | 6,588 | 4 | Health |
| MONTGOMERY COUNTY MUD 15 | 6,564 | 0 | Clean |
| HARRIS COUNTY WCID 84 | 6,552 | 0 | Clean |
| MISSION BEND MUD 1 | 6,546 | 0 | Clean |
| BIG OAKS MUD | 6,450 | 0 | Clean |
| SIENNA MUD 4 | 6,435 | 0 | Clean |
| MONTGOMERY COUNTY MUD 95 | 6,435 | 0 | Clean |
| HARRIS COUNTY MUD 65 | 6,330 | 0 | Clean |
| FORT BEND COUNTY MUD 35 | 6,297 | 0 | Clean |
| GRAND MISSION MUD 2 | 6,285 | 0 | Clean |
| FORT BEND COUNTY MUD 50 | 6,234 | 0 | Clean |
| CINCO MUD 14 | 6,192 | 0 | Clean |
| HARRIS COUNTY MUD 364 | 6,168 | 0 | Clean |
| HARRIS COUNTY MUD 222 | 6,129 | 0 | Clean |
| CITY OF HOUSTON DISTRICT 73 | 6,105 | 0 | Clean |
| CINCO SOUTHWEST MUD 4 | 6,093 | 0 | Clean |
| HARRIS COUNTY UD 16 | 6,069 | 0 | Clean |
| HARRIS COUNTY MUD 400 - EAST | 6,066 | 0 | Clean |
| LAKE MUD | 6,048 | 0 | Clean |
| FORT BEND COUNTY FWSD 1 | 6,030 | 0 | Clean |
| FORT BEND COUNTY MUD 146 | 5,985 | 0 | Clean |
| HARRIS COUNTY MUD 16 | 5,982 | 0 | Clean |
| HARRIS COUNTY MUD 457 | 5,967 | 0 | Clean |
| WEST HARRIS COUNTY MUD 9 | 5,961 | 4 | Health |
| MONTGOMERY COUNTY MUD 9 | 5,949 | 0 | Clean |
| PRESTONWOOD FOREST UTILITY DISTRICT | 5,940 | 0 | Clean |
| BRAZORIA COUNTY MUD 29 | 5,898 | 0 | Clean |
| HARRIS COUNTY MUD 180 | 5,892 | 2 | Health |
| HARRIS COUNTY WCID 74 | 5,886 | 0 | Clean |
| CHARTERWOOD MUD | 5,832 | 0 | Clean |
| FORT BEND COUNTY MUD 134D | 5,796 | 0 | Clean |
| HARRIS COUNTY MUD 70 | 5,763 | 0 | Clean |
| HARRIS COUNTY MUD 319 | 5,751 | 0 | Clean |
| CINCO MUD 8 | 5,613 | 0 | Clean |
| SPENCER ROAD PUD | 5,607 | 0 | Clean |
| HARRIS COUNTY MUD 239 | 5,583 | 0 | Clean |
| FORT BEND COUNTY MUD 162 | 5,553 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 19 | 5,535 | 0 | Clean |
| HARRIS COUNTY MUD 374 CYPRESS CREEK LAKE | 5,526 | 0 | Clean |
| MONTGOMERY COUNTY MUD 139 | 5,523 | 0 | Clean |
| CINCO SOUTHWEST MUD 2 | 5,496 | 0 | Clean |
| HARRIS COUNTY MUD 5 | 5,487 | 0 | Clean |
| HARRIS COUNTY MUD 163 | 5,487 | 0 | Clean |
| HARRIS COUNTY MUD 502 | 5,487 | 0 | Clean |
| MONTGOMERY COUNTY MUD 8 | 5,472 | 2 | Health |
| MONTGOMERY COUNTY MUD 112 | 5,454 | 0 | Clean |
| HARRIS COUNTY MUD 148 KINGSLAKE | 5,448 | 0 | Clean |
| FORT BEND COUNTY MUD 26 QUAIL GREEN WEST | 5,424 | 0 | Clean |
| FULSHEAR MUD 3A | 5,421 | 0 | Clean |
| HARRIS COUNTY MUD 46 | 5,418 | 1 | Health |
| CHIMNEY HILL MUD | 5,409 | 0 | Clean |
| TATTOR ROAD MUD | 5,400 | 0 | Clean |
| BILMA PUD | 5,397 | 2 | Health |
| HARRIS COUNTY MUD 86 | 5,397 | 0 | Clean |
| ROLLING CREEK UTILITY DISTRICT | 5,388 | 0 | Clean |
| FORT BEND COUNTY MUD 34 | 5,367 | 0 | Clean |
| FORT BEND COUNTY MUD 118 | 5,346 | 0 | Clean |
| MOUNT HOUSTON ROAD MUD | 5,346 | 0 | Clean |
| KAUFMAN COUNTY FWSD 1C | 5,346 | 0 | Clean |
| WESTADOR MUD | 5,337 | 0 | Clean |
| FORT BEND COUNTY MUD 57 | 5,335 | 0 | Clean |
| CORNERSTONES MUD | 5,331 | 0 | Clean |
| BRAZORIA COUNTY MUD 22 | 5,310 | 0 | Clean |
| MAYDE CREEK MUD | 5,301 | 1 | Health |
| FORT BEND COUNTY MUD 155 | 5,292 | 0 | Clean |
| WEST HARRIS COUNTY MUD 7 | 5,289 | 0 | Clean |
| BRAZORIA COUNTY MUD 25 | 5,250 | 0 | Clean |
| HARRIS COUNTY MUD 127 | 5,247 | 0 | Clean |
| BRAZORIA COUNTY MUD 55 | 5,229 | 0 | Clean |
| HARRIS COUNTY MUD 400 - WEST | 5,217 | 0 | Clean |
| FORT BEND COUNTY MUD 194 | 5,211 | 0 | Clean |
| CINCO SOUTHWEST MUD 3 DAYCARE | 5,187 | 0 | Clean |
| SIENNA MUD 6 | 5,184 | 0 | Clean |
| MONTGOMERY COUNTY MUD 94 | 5,184 | 0 | Clean |
| HARRIS COUNTY MUD 33 | 5,181 | 0 | Clean |
| DENTON COUNTY FWSD 11-A | 5,160 | 0 | Clean |
| HARRIS COUNTY WCID 114 | 5,160 | 18 | Health |
| HARRIS COUNTY MUD 179 | 5,115 | 0 | Clean |
| HARRIS COUNTY MUD 276 | 5,094 | 0 | Clean |
| FORT BEND COUNTY MUD 119 | 5,088 | 0 | Clean |
| HARRIS COUNTY WCID 133 | 5,082 | 0 | Clean |
| FORT BEND COUNTY MUD 190 | 5,049 | 0 | Clean |
| HARRIS COUNTY IMPROVEMENT DISTRICT 18 | 5,025 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 32 | 5,016 | 0 | Clean |
| HARRIS COUNTY MUD 495 | 5,007 | 0 | Clean |
| MONTGOMERY COUNTY UD 4 | 4,980 | 0 | Clean |
| NORTH GREEN MUD | 4,941 | 0 | Clean |
| RICEWOOD MUD | 4,908 | 0 | Clean |
| HARRIS COUNTY MUD 383 | 4,881 | 0 | Clean |
| KLEINWOOD MUD | 4,872 | 4 | Health |
| HARRIS COUNTY MUD 104 | 4,854 | 0 | Clean |
| LOUETTA NORTH PUD | 4,848 | 0 | Clean |
| HARRIS COUNTY MUD 221 | 4,839 | 0 | Clean |
| BRAZORIA COUNTY MUD 21 | 4,833 | 0 | Clean |
| FORT BEND COUNTY MUD 116 CANYON GATE | 4,833 | 0 | Clean |
| HARRIS COUNTY MUD 432 | 4,782 | 0 | Clean |
| MONTGOMERY COUNTY MUD 89 | 4,761 | 0 | Clean |
| HARRIS COUNTY MUD 119 | 4,758 | 0 | Clean |
| HARRIS COUNTY WCID 92 | 4,752 | 0 | Clean |
| CINCO MUD 2 | 4,743 | 0 | Clean |
| HARRIS COUNTY MUD 501 | 4,740 | 0 | Clean |
| HARRIS COUNTY MUD 360 | 4,707 | 0 | Clean |
| HARRIS COUNTY MUD 106 | 4,668 | 0 | Clean |
| HARRIS FORT BEND COUNTIES MUD 5 | 4,641 | 0 | Clean |
| HARRIS COUNTY MUD 185 | 4,617 | 0 | Clean |
| FOUNTAINHEAD MUD | 4,614 | 0 | Clean |
| MONTGOMERY COUNTY MUD 115 | 4,599 | 0 | Clean |
| SUNBELT FWSD WOODLAND OAKS SUBDIVISION | 4,578 | 0 | Clean |
| FORT BEND COUNTY MUD 152 | 4,575 | 0 | Clean |
| HARRIS COUNTY MUD 130 | 4,572 | 0 | Clean |
| CHELFORD ONE MUD | 4,557 | 0 | Clean |
| HARRIS COUNTY MUD 344 | 4,518 | 0 | Clean |
| HARRIS COUNTY MUD 284 | 4,506 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 23 | 4,470 | 0 | Clean |
| WOODCREEK MUD | 4,464 | 0 | Clean |
| RENN ROAD MUD | 4,464 | 4 | Health |
| HARRIS COUNTY MUD 365 | 4,461 | 0 | Clean |
| HARRIS COUNTY MUD 370 | 4,452 | 0 | Clean |
| CLAY ROAD MUD | 4,443 | 0 | Clean |
| HARRIS COUNTY MUD 69 | 4,422 | 0 | Clean |
| MONTGOMERY COUNTY MUD 19 | 4,422 | 0 | Clean |
| HARRIS COUNTY MUD 397 | 4,413 | 0 | Clean |
| HARRIS COUNTY MUD 172 | 4,404 | 0 | Clean |
| FORT BEND COUNTY MUD 42 WAT PLAT | 4,395 | 0 | Clean |
| KINGS MANOR MUD | 4,377 | 0 | Clean |
| FORT BEND COUNTY MUD 165 | 4,314 | 0 | Clean |
| SIENNA MUD 12 | 4,311 | 0 | Clean |
| CYPRESSWOOD UTILITY DISTRICT | 4,305 | 3 | Health |
| HARRIS COUNTY MUD 322 | 4,266 | 0 | Clean |
| PLANTATION MUD | 4,260 | 0 | Clean |
| CINCO MUD 7 | 4,239 | 0 | Clean |
| HARRIS COUNTY MUD 166 | 4,239 | 0 | Clean |
| BRAZORIA COUNTY MUD 3 | 4,230 | 0 | Clean |
| CITY OF SPRING VALLEY VILLAGE | 4,229 | 0 | Clean |
| SPRING MEADOWS MUD | 4,200 | 0 | Clean |
| HARRIS COUNTY MUD 536 | 4,188 | 0 | Clean |
| FORT BEND COUNTY MUD 41 | 4,179 | 0 | Clean |
| SIENNA PLANTATION MANAGEMENT DISTRICT | 4,179 | 0 | Clean |
| BRAZORIA - FORT BEND COUNTIES MUD 3 | 4,149 | 0 | Clean |
| FORT BEND COUNTY MUD 123 | 4,143 | 0 | Clean |
| FORT BEND COUNTY MUD 81 WESTON LAKES | 4,107 | 0 | Clean |
| CHAMPIONS MUD | 4,098 | 0 | Clean |
| HARRIS-WALLER COUNTIES MUD 5 | 4,098 | 0 | Clean |
| HARRIS COUNTY MUD 18 HEATHERWOOD HUNTERS | 4,083 | 0 | Clean |
| VALLEY RANCH MUD 1 | 4,056 | 0 | Clean |
| HARRIS COUNTY MUD 423 | 4,044 | 0 | Clean |
| HARRIS COUNTY MUD 342 | 4,035 | 0 | Clean |
| EAST MONTGOMERY COUNTY MUD 7 | 4,035 | 0 | Clean |
| HARRIS COUNTY MUD 186 | 4,005 | 0 | Clean |
| HARRIS COUNTY MUD 183 | 3,981 | 0 | Clean |
| FORT BEND COUNTY MUD 48 | 3,969 | 0 | Clean |
| CYPRESS KLEIN UTILITY DISTRICT WIMBLETON | 3,960 | 0 | Clean |
| EAST MONTGOMERY COUNTY MUD 6 | 3,939 | 0 | Clean |
| HARRIS COUNTY MUD 6 CARRIAGE LANE | 3,936 | 0 | Clean |
| SOUTHERN WATER | 3,933 | 0 | Clean |
| CYPRESS FOREST PUD | 3,912 | 0 | Clean |
| WESTLAKE MUD 1 | 3,909 | 0 | Clean |
| NORTHGATE CROSSING MUD 1 | 3,906 | 0 | Clean |
| DENTON COUNTY FWSD 11-B | 3,897 | 0 | Clean |
| HARRIS COUNTY MUD 173 | 3,894 | 0 | Clean |
| GRAND LAKES MUD 4 | 3,867 | 0 | Clean |
| HARRIS COUNTY MUD 345 | 3,855 | 0 | Clean |
| CINCO MUD 9 | 3,828 | 0 | Clean |
| MONTGOMERY COUNTY UD 3 | 3,825 | 0 | Clean |
| HARRIS COUNTY MUD 534 | 3,822 | 0 | Clean |
| HARRIS FORT BEND COUNTIES MUD 1 | 3,812 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 30 | 3,804 | 0 | Clean |
| CITY OF BUNKER HILL VILLAGE | 3,771 | 0 | Clean |
| NORTHGATE CROSSING MUD 2 | 3,753 | 0 | Clean |
| HARRIS COUNTY MUD 401 | 3,750 | 0 | Clean |
| POSTWOOD MUD | 3,747 | 0 | Clean |
| ENCANTO REAL UTILITY DISTRICT | 3,717 | 0 | Clean |
| FRY ROAD MUD | 3,711 | 3 | Health |
| NORTHWEST FREEWAY MUD | 3,678 | 0 | Clean |
| MONTGOMERY COUNTY MUD 99 | 3,675 | 0 | Clean |
| FORT BEND COUNTY MUD 229 | 3,666 | 0 | Clean |
| FORT BEND COUNTY MUD 185 | 3,663 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 36 | 3,648 | 0 | Clean |
| HARRIS COUNTY MUD 11 | 3,645 | 0 | Clean |
| HARRIS COUNTY MUD 208 | 3,642 | 0 | Clean |
| HARRIS COUNTY WCID 116 | 3,627 | 0 | Clean |
| HARRIS COUNTY MUD 216 | 3,627 | 0 | Clean |
| EL DORADO UTILITY DISTRICT | 3,591 | 0 | Clean |
| WEST HARRIS COUNTY MUD 5 | 3,591 | 0 | Clean |
| FORT BEND COUNTY MUD 222 | 3,582 | 0 | Clean |
| HARRIS COUNTY MUD 264 | 3,573 | 0 | Clean |
| HARRIS COUNTY MUD 281 | 3,573 | 0 | Clean |
| BRAZORIA COUNTY MUD 2 | 3,567 | 0 | Clean |
| HARRIS COUNTY MUD 149 | 3,543 | 0 | Clean |
| HARRIS COUNTY MUD 62 | 3,519 | 0 | Clean |
| HARRIS COUNTY MUD 287 | 3,510 | 0 | Clean |
| KLEIN PUD | 3,504 | 0 | Clean |
| HARRIS COUNTY WCID 132 | 3,501 | 0 | Clean |
| HARRIS COUNTY MUD 257 | 3,501 | 0 | Clean |
| PINE VILLAGE PUD | 3,498 | 0 | Clean |
| HARRIS COUNTY UD 15 | 3,489 | 0 | Clean |
| HARRIS COUNTY MUD 412 | 3,480 | 0 | Clean |
| FORT BEND COUNTY MUD 121 | 3,477 | 0 | Clean |
| WILLOW CREEK FARMS MUD | 3,453 | 0 | Clean |
| OAKMONT PUD | 3,450 | 0 | Clean |
| WEST HARRIS COUNTY MUD 6 | 3,435 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 20 | 3,429 | 0 | Clean |
| HARRIS COUNTY MUD 249 | 3,420 | 0 | Clean |
| GRANT ROAD PUD | 3,393 | 0 | Clean |
| MONTGOMERY COUNTY UD 2 | 3,381 | 0 | Clean |
| FORT BEND COUNTY MUD 122 | 3,366 | 0 | Clean |
| WEST HARRIS COUNTY MUD 17 | 3,354 | 1 | Health |
| HARRIS COUNTY MUD 558 | 3,300 | 0 | Clean |
| MONTGOMERY COUNTY MUD 105 | 3,282 | 0 | Clean |
| HARRIS COUNTY MUD 8 | 3,271 | 0 | Clean |
| HARRIS COUNTY MUD 282 | 3,237 | 0 | Clean |
| POINT AQUARIUS MUD | 3,228 | 0 | Clean |
| SUNBELT FWSD NORTHLINE TERRACE | 3,225 | 0 | Clean |
| GRAND LAKES MUD 1 | 3,219 | 0 | Clean |
| HARRIS COUNTY MUD 144 | 3,219 | 2 | Health |
| HARRIS COUNTY MUD 136 | 3,201 | 0 | Clean |
| HARRIS COUNTY MUD 396 | 3,201 | 0 | Clean |
| HARRIS COUNTY WCID 136 | 3,192 | 0 | Clean |
| FORT BEND COUNTY MUD 24 | 3,177 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 22 | 3,156 | 0 | Clean |
| FORT BEND COUNTY MUD 130 | 3,150 | 0 | Clean |
| HARRIS COUNTY WCID FONDREN ROAD | 3,144 | 0 | Clean |
| HARRIS COUNTY WCID 161 | 3,129 | 0 | Clean |
| TERRANOVA WEST MUD | 3,120 | 0 | Clean |
| FORT BEND COUNTY MUD 131 | 3,114 | 0 | Clean |
| DENTON COUNTY FWSD 8-B | 3,090 | 0 | Clean |
| BAYBROOK MUD 1 | 3,087 | 16 | Health |
| WOOD TRACE MUD 1 | 3,084 | 0 | Clean |
| CINCO MUD 6 | 3,048 | 0 | Clean |
| BRAZORIA COUNTY MUD 39 | 3,036 | 0 | Clean |
| HARRIS COUNTY MUD 147 | 3,003 | 0 | Clean |
| HARRIS COUNTY WCID 91 | 3,000 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 29 | 3,000 | 1 | Health |
| CYPRESS CREEK UTILITY DISTRICT | 2,988 | 0 | Clean |
| GREEN TRAILS MUD | 2,982 | 0 | Clean |
| HARRIS COUNTY MUD 399 | 2,967 | 0 | Clean |
| HARRIS COUNTY MUD 480 | 2,964 | 0 | Clean |
| DENTON COUNTY FWSD 8-A | 2,955 | 0 | Clean |
| FOREST HILLS MUD | 2,955 | 0 | Clean |
| SUNBELT FWSD HEATHER GLEN SUBDIVISION | 2,943 | 0 | Clean |
| HARRIS COUNTY MUD 202 | 2,940 | 0 | Clean |
| GALVESTON COUNTY MUD 12 | 2,900 | 1 | Health |
| HARRIS COUNTY MUD 280 | 2,898 | 0 | Clean |
| FORT BEND COUNTY MUD 47 | 2,874 | 0 | Clean |
| HARRIS COUNTY MUD 434 | 2,859 | 0 | Clean |
| RANKIN ROAD WEST MUD | 2,838 | 0 | Clean |
| EAST MONTGOMERY COUNTY MUD 12 | 2,838 | 0 | Clean |
| HARRIS COUNTY MUD 155 | 2,829 | 6 | Health |
| MORTON ROAD MUD | 2,817 | 22 | Health |
| HARRIS COUNTY MUD 552 | 2,814 | 0 | Clean |
| FORT BEND COUNTY MUD 141 | 2,790 | 2 | Health |
| TIMBERLAKE IMPROVEMENT DISTRICT | 2,775 | 0 | Clean |
| NORTH BELT UTILITY DISTRICT | 2,775 | 0 | Clean |
| HARRIS COUNTY UD 14 | 2,769 | 0 | Clean |
| MONTGOMERY COUNTY MUD 98 | 2,766 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 16 | 2,742 | 0 | Clean |
| FORT BEND COUNTY MUD 134E | 2,733 | 0 | Clean |
| MONTGOMERY COUNTY MUD 138 | 2,712 | 0 | Clean |
| WEST HARRIS COUNTY MUD 14 | 2,688 | 0 | Clean |
| HARRIS COUNTY MUD 389 | 2,676 | 0 | Clean |
| HARRIS COUNTY MUD 162 | 2,661 | 0 | Clean |
| BRAZORIA COUNTY MUD 56 | 2,643 | 0 | Clean |
| HARRIS COUNTY FWSD 1A | 2,640 | 4 | Health |
| SPRING WEST MUD | 2,639 | 0 | Clean |
| HARRIS COUNTY MUD 372 | 2,619 | 0 | Clean |
| MONTGOMERY COUNTY MUD 24 | 2,613 | 0 | Clean |
| HARRIS COUNTY MUD 542 | 2,592 | 0 | Clean |
| CINCO MUD 10 | 2,583 | 0 | Clean |
| HARRIS COUNTY MUD 371 | 2,577 | 0 | Clean |
| PALMER PLANTATION MUD 2 | 2,559 | 0 | Clean |
| MONTGOMERY COUNTY MUD 84 | 2,553 | 0 | Clean |
| BAMMEL UTILITY DISTRICT | 2,550 | 0 | Clean |
| WOODRIDGE MUD | 2,550 | 0 | Clean |
| FORT BEND COUNTY MUD 124 | 2,544 | 0 | Clean |
| HARRIS COUNTY MUD 215 | 2,541 | 0 | Clean |
| HARRIS COUNTY MUD 217 | 2,538 | 0 | Clean |
| WHITE OAK BEND MUD | 2,520 | 0 | Clean |
| CINCO MUD 3 | 2,517 | 0 | Clean |
| CASTLEWOOD MUD | 2,505 | 0 | Clean |
| MONTGOMERY COUNTY MUD 111 | 2,502 | 0 | Clean |
| CHAMBERS COUNTY MUD 1 | 2,500 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 21 | 2,493 | 0 | Clean |
| MONTGOMERY COUNTY MUD 127 | 2,478 | 0 | Clean |
| SPRING CREEK FOREST PUD | 2,472 | 0 | Clean |
| HARRIS COUNTY IMPROVEMENT DISTRICT 14 | 2,469 | 0 | Clean |
| CINCO MUD 5 | 2,460 | 2 | Health |
| CITY OF SOUTHSIDE PLACE | 2,457 | 0 | Clean |
| BEECHNUT MUD | 2,451 | 0 | Clean |
| INVERNESS FOREST IMPROVEMENT DISTRICT | 2,448 | 0 | Clean |
| HARRIS COUNTY MUD 341 | 2,421 | 1 | Health |
| HARRIS COUNTY MUD 531 | 2,421 | 0 | Clean |
| FORT BEND COUNTY MUD 218 | 2,412 | 0 | Clean |
| ROLLING FORK PUD | 2,397 | 0 | Clean |
| HARRIS MONTGOMERY COUNTIES MUD 386 MAY V | 2,364 | 0 | Clean |
| HARRIS COUNTY WCID 99 | 2,343 | 0 | Clean |
| MONTGOMERY COUNTY MUD 96 | 2,334 | 0 | Clean |
| SHASLA PUD | 2,310 | 0 | Clean |
| HARRIS COUNTY MUD 422 | 2,307 | 0 | Clean |
| HARRIS COUNTY MUD 44 | 2,301 | 0 | Clean |
| KIRKMONT MUD | 2,277 | 0 | Clean |
| CINCO MUD 12 | 2,274 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 6 | 2,256 | 0 | Clean |
| EAST MONTGOMERY COUNTY MUD 3 | 2,250 | 0 | Clean |
| FORT BEND COUNTY MUD 46 | 2,247 | 0 | Clean |
| FORT BEND COUNTY MUD 158 | 2,214 | 0 | Clean |
| MONTGOMERY COUNTY MUD 83 | 2,208 | 0 | Clean |
| HARRIS COUNTY MUD 465 | 2,168 | 0 | Clean |
| MONTGOMERY COUNTY MUD 144 | 2,106 | 0 | Clean |
| HARRIS COUNTY MUD 156 | 2,082 | 0 | Clean |
| GRAND LAKES MUD 2 | 2,076 | 0 | Clean |
| MONTGOMERY COUNTY MUD 164 | 2,076 | 0 | Clean |
| LAKE CONROE HILLS MUD | 2,058 | 0 | Clean |
| AUDUBON MUD 1 | 2,049 | 0 | Clean |
| HARRIS COUNTY MUD 530 | 2,034 | 0 | Clean |
| PALMER PLANTATION MUD 1 | 2,031 | 0 | Clean |
| FAR HILLS UTILITY DISTRICT | 2,030 | 0 | Clean |
| HARRIS COUNTY MUD 540 | 2,022 | 0 | Clean |
| HARRIS COUNTY MUD 61 | 2,016 | 0 | Clean |
| GRAND OAKS MUD | 2,013 | 0 | Clean |
| BRAZORIA COUNTY MUD 40 | 1,986 | 0 | Clean |
| SEDONA LAKES MUD 1 | 1,977 | 0 | Clean |
| DENTON COUNTY FWSD 11-C | 1,977 | 0 | Clean |
| HARRIS COUNTY FWSD 58 | 1,968 | 0 | Clean |
| HARRIS COUNTY MUD 494 | 1,944 | 0 | Clean |
| HARRIS COUNTY MUD 420 | 1,941 | 0 | Clean |
| MEMORIAL HILLS UTILITY DISTRICT | 1,929 | 0 | Clean |
| HARRIS COUNTY MUD 213-A | 1,926 | 0 | Clean |
| FORT BEND COUNTY MUD 184 | 1,884 | 3 | Health |
| NORTHEAST HARRIS COUNTY MUD 1 EDGEWOOD V | 1,842 | 0 | Clean |
| FORT BEND COUNTY MUD 206 VICTORIAN GARDE | 1,836 | 0 | Clean |
| MONTGOMERY COUNTY MUD 180 | 1,827 | 0 | Clean |
| ELLIS COUNTY FWSD 1 | 1,812 | 0 | Clean |
| FORT BEND COUNTY MUD 220 | 1,812 | 0 | Clean |
| LONGHORN TOWN UTILITY DISTRICT | 1,788 | 0 | Clean |
| NORTHEAST HARRIS COUNTY MUD 1 SHELDON RI | 1,788 | 0 | Clean |
| HARRIS COUNTY MUD 220 | 1,773 | 0 | Clean |
| FORT BEND COUNTY MUD 156 | 1,719 | 0 | Clean |
| HARRIS COUNTY MUD 572 | 1,698 | 0 | Clean |
| GENERATION PARK MANAGEMENT DISTRICT | 1,687 | 0 | Clean |
| WILLOW POINT MUD | 1,668 | 0 | Clean |
| FORT BEND COUNTY MUD 37 | 1,662 | 0 | Clean |
| HARRIS COUNTY MUD 559 | 1,629 | 0 | Clean |
| NORTHWEST HARRIS COUNTY MUD 28 | 1,605 | 0 | Clean |
| WEST HARRIS COUNTY MUD 1 | 1,581 | 0 | Clean |
| WEST HARRIS COUNTY MUD 4 | 1,581 | 0 | Clean |
| SOUTHWEST HARRIS COUNTY MUD 1 | 1,581 | 5 | Health |
| HARRIS COUNTY MUD 205 | 1,560 | 0 | Clean |
| NORTH FOREST MUD | 1,545 | 2 | Health |
| FORT BEND COUNTY MUD 216 | 1,521 | 0 | Clean |
| EAST MONTGOMERY COUNTY MUD 4 | 1,500 | 0 | Clean |
| FORT BEND COUNTY MUD 19 | 1,479 | 0 | Clean |
| MONTGOMERY COUNTY MUD 145 | 1,476 | 0 | Clean |
| HARRIS COUNTY MUD 36 | 1,464 | 0 | Clean |
| HARRIS COUNTY MUD 261 | 1,452 | 0 | Clean |
| MONTGOMERY COUNTY MUD 166 | 1,443 | 0 | Clean |
| PINEHURST DECKER PRAIRIE WSC | 1,437 | 0 | Clean |
| HARRIS COUNTY MUD 275 | 1,428 | 0 | Clean |
| HARRIS COUNTY MUD 537 | 1,416 | 0 | Clean |
| LOUETTA ROAD UTILITY DISTRICT | 1,410 | 0 | Clean |
| BEAVER CREEK WCID 1 | 1,407 | 6 | Health |
| WALLER COUNTY ROAD IMPROVEMENT DIST 1 | 1,400 | 0 | Clean |
| MONTGOMERY COUNTY MUD 152A | 1,344 | 0 | Clean |
| HARRIS COUNTY MUD 490 | 1,293 | 0 | Clean |
| MEMORIAL POINT UTILITIES DISTRICT | 1,285 | 0 | Clean |
| HARRIS COUNTY MUD 421 | 1,269 | 0 | Clean |
| HARRIS COUNTY MUD 551 | 1,269 | 0 | Clean |
| FORT BEND COUNTY MUD 145 RIO VISTA | 1,263 | 0 | Clean |
| HARRIS COUNTY WCID 113 ENCHANTED VILLAGE | 1,233 | 0 | Clean |
| CHARLESTON MUD | 1,212 | 0 | Clean |
| MONTGOMERY COUNTY MUD 199 | 1,203 | 0 | Clean |
| HARRIS COUNTY MUD 255 | 1,185 | 0 | Clean |
| HARRIS COUNTY MUD 122 | 1,158 | 0 | Clean |
| HARRIS COUNTY MUD 500 | 1,158 | 0 | Clean |
| HARRIS COUNTY WCID 156 | 1,116 | 0 | Clean |
| HARRIS COUNTY MUD 570C | 1,113 | 0 | Clean |
| CITY OF HOUSTON DISTRICT 82 | 1,104 | 0 | Clean |
| ROYALWOOD MUD | 1,101 | 4 | Health |
| CORINTHIAN POINT MUD 2 | 1,086 | 0 | Clean |
| LUCE BAYOU PUD | 1,083 | 0 | Clean |
| FORT BEND COUNTY MUD 49 | 1,080 | 0 | Clean |
| HARRIS COUNTY MUD 547 | 1,074 | 0 | Clean |
| BAKER ROAD MUD | 1,062 | 0 | Clean |
| SEQUOIA IMPROVEMENT DISTRICT | 1,038 | 0 | Clean |
| MONTGOMERY COUNTY MUD 141 | 978 | 2 | Health |
| MONTGOMERY COUNTY MUD 56 | 963 | 0 | Clean |
| CITY OF HILSHIRE VILLAGE | 945 | 3 | Health |
| TEXAS NATIONAL MUD | 931 | 1 | Health |
| HARRIS COUNTY MUD 250 | 930 | 0 | Clean |
| FIVE OAKS MOBILE HOME SUBDIVISION | 915 | 1 | Health |
| HARRIS COUNTY MUD 286 | 879 | 0 | Clean |
| HARRIS COUNTY MUD 539 | 870 | 0 | Clean |
| MOUNT HOUSTON SQUARE | 836 | 0 | Clean |
| WEST HARRIS COUNTY MUD 15 | 834 | 0 | Clean |
| HARRIS COUNTY MUD 576 | 822 | 0 | Clean |
| HARRIS COUNTY MUD 503 | 819 | 0 | Clean |
| BIG SKY MUD | 813 | 0 | Clean |
| HARRIS COUNTY MUD 321 | 807 | 0 | Clean |
| FORT BEND COUNTY MUD 132 | 795 | 0 | Clean |
| NORTHWOOD MUD 1 | 795 | 0 | Clean |
| FORT BEND COUNTY MUD 192 | 758 | 0 | Clean |
| CITY OF KEMAH MMD 1 | 741 | 0 | Clean |
| SPORTSMANS WORLD MUD | 735 | 50 | Health |
| BRAZORIA COUNTY MUD 24 | 708 | 0 | Clean |
| SUNBELT FWSD OAKGLEN SUBDIVISION | 684 | 0 | Clean |
| FORT BEND COUNTY MUD 198 | 675 | 0 | Clean |
| LAZY RIVER IMPROVEMENT DISTRICT | 672 | 0 | Clean |
| CLOVERCREEK MUD | 662 | 0 | Clean |
| FORT BEND COUNTY MUD 134F | 661 | 0 | Clean |
| GALVESTON COUNTY WCID 19 | 660 | 13 | Health |
| HARRIS COUNTY MUD 405 | 657 | 0 | Clean |
| RICHEY ROAD MUD | 651 | 0 | Clean |
| FORT BEND COUNTY WCID 3 | 648 | 0 | Clean |
| BRAZORIA COUNTY MUD 44 | 630 | 0 | Clean |
| WHITE OAK MANOR MOBILE HOME PARK | 630 | 0 | Clean |
| WEST HOUSTON MHC | 630 | 1 | Health |
| MONTGOMERY COUNTY MUD 42 | 630 | 0 | Clean |
| MONTGOMERY COUNTY MUD 16 WHITE OAK PLANT | 627 | 0 | Clean |
| FORT BEND COUNTY MUD 189 | 624 | 0 | Clean |
| HUNTER PLACE | 606 | 0 | Clean |
| HOOKS MOBILE HOME PARK | 585 | 0 | Clean |
| WILDWOOD MOBILE HOME VILLAGE | 577 | 20 | Health |
| FORT BEND COUNTY MUD 250A | 576 | 0 | Clean |
| HARRIS COUNTY MUD 578 | 576 | 0 | Clean |
| HARRIS COUNTY MUD 569 | 549 | 0 | Clean |
| OAK MANOR MUD | 537 | 0 | Clean |
| CINCO SOUTHWEST MUD 1 | 513 | 0 | Clean |
| FORT BEND COUNTY MUD 195 | 513 | 0 | Clean |
| HARRIS COUNTY FWSD 45 | 504 | 1 | Health |
| HARRIS COUNTY MUD 458 | 501 | 0 | Clean |
| ORANGE GROVE WATER SUPPLY | 498 | 0 | Clean |
| FORT BEND COUNTY MUD 66 | 495 | 0 | Clean |
| HORSESHOE BEND | 492 | 1 | Health |
| CYPRESSWOOD SUBDIVISION WATER SYSTEM | 490 | 0 | Clean |
| HARRIS COUNTY MUD 48 | 483 | 0 | Clean |
| BURLESON COUNTY MUD 1 | 480 | 9 | Health |
| LAMAR IMPROVEMENT DISTRICT | 450 | 0 | Clean |
| PRESERVE AT HIGHWAY 6 | 450 | 0 | Clean |
| KINGMONT MOBILE HOME PARK | 420 | 1 | Health |
| SEVEN HILLS RANCH | 414 | 0 | Clean |
| RAMBLE RIDGE SUBDIVISION | 411 | 226 | Health |
| AIRPORT ROAD MUD | 411 | 0 | Clean |
| HARRIS COUNTY MUD 211 | 405 | 0 | Clean |
| CYPRESS FOREST WATER SYSTEM | 396 | 0 | Clean |
| HARRIS COUNTY MUD 233 | 390 | 0 | Clean |
| BRAZORIA COUNTY MUD 87 | 387 | 0 | Clean |
| FORT BEND COUNTY MUD 255 | 387 | 0 | Clean |
| RALSTON ACRES WATER SUPPLY CORPORATION | 385 | 0 | Clean |
| CITY OF HOUSTON BELLEAU WOODS | 381 | 0 | Clean |
| PROVENCE WATER SYSTEM | 366 | 0 | Clean |
| SPANISH COVE PUD | 357 | 0 | Clean |
| GREENLAND SQUARE SUBDIVISION WS | 357 | 0 | Clean |
| PIN OAK MOBILE HOME PARK | 345 | 0 | Clean |
| HARRIS COUNTY MUD 532 | 342 | 0 | Clean |
| BLAKETREE MUD 1 | 336 | 0 | Clean |
| BENDER CREEK APARTMENTS | 330 | 0 | Clean |
| MONTGOMERY COUNTY MUD 211 | 330 | 0 | Clean |
| ADVANCED RV PARK | 327 | 0 | Clean |
| WESTMONT MOBILE HOME COMMUNITY | 309 | 3 | Health |
| SAVANNAH PLANTATION SUBDIVISION | 300 | 0 | Clean |
| BAYOU FOREST VILLAGE MOBILE HOME PARK | 297 | 1 | Health |
| LAGO BELLO MUD 1A | 297 | 0 | Clean |
| LAKE HOUSTON STORAGE | 294 | 0 | Clean |
| KIRBY LANDING COMMUNITY | 285 | 0 | Clean |
| SUNDOWN MOBILE HOME PARK | 282 | 0 | Clean |
| NEW PROGRESS WATER SPRING VALLEY | 282 | 1 | Health |
| HARRIS COUNTY MUD 477 | 267 | 0 | Clean |
| HARRIS COUNTY MUD 544 | 264 | 0 | Clean |
| MONTGOMERY COUNTY MUD 172 | 264 | 0 | Clean |
| BRAZORIA COUNTY MUD 57 MCCOY PARKWAY | 255 | 0 | Clean |
| HARRIS COUNTY MUD 493 | 255 | 0 | Clean |
| MANVEL ROAD TERRACE SUBDIVISION | 240 | 1 | Health |
| HARRIS COUNTY MUD 525 | 237 | 0 | Clean |
| RIVER OAKS SUBDIVISION | 234 | 6 | Health |
| CHAMBERS COUNTY MUD 3 | 234 | 0 | Clean |
| PONDEROSA HILLS SUBDIVISION | 231 | 1 | Health |
| TIDWELL FOREST NEW SUBDIVISION | 225 | 1 | Health |
| RIVER RANCH MUD 3 | 225 | 0 | Clean |
| HARRIS COUNTY MUD 358 | 222 | 0 | Clean |
| NEW PROGRESS WSC ENCHANTED OAKS SUBDIVIS | 222 | 3 | Health |
| MONTGOMERY COUNTY MUD 158 | 219 | 0 | Clean |
| CASITAS DEL RIO | 216 | 0 | Clean |
| EAST MONTGOMERY COUNTY MUD 14 | 213 | 0 | Clean |
| KING RANCH SANTA GERTRUDIS DISTRICT | 212 | 0 | Clean |
| CARBY MOBILE HOME PARK | 210 | 0 | Clean |
| WALLER COUNTY MUD 37 | 207 | 0 | Clean |
| MONTGOMERY COUNTY MUD 185 | 195 | 0 | Clean |
| LINCOLN SQUARE SUBDIVISION PWS | 189 | 0 | Clean |
| HIGHLAND LAKES | 180 | 3 | Health |
| CHAMPION LAKES ESTATES WATER PLANT | 174 | 0 | Clean |
| SUGAR PINES MHP | 170 | 4 | Health |
| RIO VILLA WSC | 165 | 0 | Clean |
| MONTGOMERY COUNTY MUD 197 | 165 | 0 | Clean |
| WALLER COUNTY MUD 45 | 153 | 0 | Clean |
| ALDINE OAKS MHP | 150 | 0 | Clean |
| TEJAS TRAILS SUBDIVISION | 147 | 0 | Clean |
| TIMBER RIDGE SECTION 2 | 141 | 28 | Health |
| ALBURY MANOR UTILITY COMPANY | 141 | 4 | Health |
| WALLER COUNTY MUD 34C | 141 | 0 | Clean |
| MONTGOMERY COUNTY MUD 201 | 136 | 0 | Clean |
| CHANNEL OAKS WATER SYSTEM | 135 | 0 | Clean |
| HARRIS COUNTY MUD 514 | 129 | 0 | Clean |
| ALDINE GARDENS MOBILE HOME PARK | 128 | 1 | Health |
| FORT BEND COUNTY WCID 8 | 126 | 0 | Clean |
| SWEA GARDENS ESTATES | 126 | 0 | Clean |
| DEER TRAIL MOBILE HOME PARK | 126 | 1 | Health |
| HARRIS COUNTY MUD 538 | 126 | 0 | Clean |
| HARRIS COUNTY LEADERSHIP ACADEMY | 125 | 1 | Health |
| SUBURBAN MOBILE HOME PARK 2 | 120 | 0 | Clean |
| MCFARLAND VILLAGE APARTMENTS | 120 | 2 | Health |
| LAZY LANE MOBILE HOME PARK | 120 | 1 | Health |
| GATEWAY DEVELOPMENT | 108 | 0 | Clean |
| WALLER COUNTY MUD 55A | 108 | 0 | Clean |
| JOHNSONS WATER SERVICE | 105 | 0 | Clean |
| COUNTRY LIVING APARTMENTS | 105 | 0 | Clean |
| ROVING MEADOWS WATER SYSTEM | 105 | 2 | Health |
| LEANING OAK MOBILE HOME PARK | 105 | 3 | Health |
| CRYSTAL LAKE MHP, LLC | 100 | 0 | Clean |
| RENES WATER SYSTEM | 100 | 1 | Health |
| REED ESTATES WATER SYSTEM | 96 | 1 | Health |
| CYPRESSWOOD MHP | 96 | 0 | Clean |
| BLUEBONNET MOBILE HOME PARK | 93 | 1 | Health |
| PADOK TIMBERS SUBDIVISION WS | 92 | 1 | Health |
| VISTA UTILITIES | 90 | 1 | Health |
| HIGHLAND MEADOWS MOBILE HOME PARK | 87 | 0 | Clean |
| ZAM ZAM WATER SUPPLY | 87 | 1 | Health |
| HARRIS COUNTY MUD 171 | 87 | 0 | Clean |
| VILLA UTILITIES | 85 | 1 | Health |
| FAIRWAY MOBILE HOME VILLAGE | 84 | 1 | Health |
| FAIRVIEW MOBILE HOME COMMUNITY | 84 | 0 | Clean |
| BOULAIS MOBILE HOME PARK | 84 | 0 | Clean |
| CLEVELAND MH AND RV PARK | 84 | 0 | Clean |
| CYPRESS GARDENS MOBILE HOME SUBDIVISION | 81 | 0 | Clean |
| CNA PLAZA APARTMENTS | 80 | 1 | Health |
| OAK ACRES MOBILE HOME PARK | 80 | 1 | Health |
| SUNSET MOBILE HOME PARK 2 | 78 | 1 | Health |
| RIVERTON RANCH | 78 | 0 | Clean |
| NOBLE ESTATES MHP | 75 | 4 | Health |
| LA CASITA HOMES II | 75 | 1 | Health |
| LONE WILLOW MHP WEST | 75 | 7 | Health |
| FAIRVIEW GARDENS MHP | 75 | 0 | Clean |
| ARENOSA CREEK ESTATES | 75 | 0 | Clean |
| WESTFIELD MEADOWS | 72 | 0 | Clean |
| TALLOWS MOBILE HOME PARK | 72 | 1 | Health |
| COUNTRY LIVING MOBILE HOME PARK | 72 | 1 | Health |
| SIENNA MUD 7 | 69 | 0 | Clean |
| HARRIS COUNTY MUD 25 BROOK HOLLOW WEST S | 69 | 46 | Health |
| SATSUMA PARK VILLA MOBILE HOME PARK | 66 | 1 | Health |
| HORTON ESTATES CONDOMINIUM TRUST, INC. | 64 | 0 | Clean |
| WHITEWING SUBDIVISION | 64 | 1 | Health |
| PEEK ROAD MOBILE HOME PARK | 63 | 1 | Health |
| HAVENSHIRE WATER SYSTEM | 63 | 1 | Health |
| RILEY ROAD ESTATES WS | 63 | 0 | Clean |
| GRANGER SUBDIVISION | 60 | 0 | Clean |
| KING RANCH LAURELES DIVISION | 60 | 4 | Health |
| ESTATES WATER CORP | 58 | 2 | Health |
| BRAZORIA COUNTY MUD 92 | 57 | 0 | Clean |
| WINDCRESS MUD OF CHAMBERS COUNTY | 57 | 0 | Clean |
| FORT BEND COUNTY MUD 188 | 54 | 0 | Clean |
| K LAKE TERRACE | 54 | 1 | Health |
| HARRIS COUNTY MUD 560 | 54 | 0 | Clean |
| COLTON MUD 2 | 54 | 0 | Clean |
| BALABAN APARTMENTS 2 | 50 | 1 | Health |
| MAR LYNN SUBDIVISION | 48 | 6 | Health |
| FORT BEND COUNTY MUD 256 | 47 | 0 | Clean |
| FORT BEND COUNTY MUD 246 | 45 | 0 | Clean |
| NORTHWOODS MOBILE HOME PARK | 45 | 2 | Health |
| SUNSET MOBILE HOME PARK 1 | 45 | 1 | Health |
| K ESTATES WATER SYSTEM | 45 | 1 | Health |
| HARRIS COUNTY MUD 565 | 45 | 0 | Clean |
| LUCKY HOMES RV PARK | 45 | 0 | Clean |
| KENDALL COUNTY WCID 3A | 45 | 0 | Clean |
| AUDUBON MUD 2 | 45 | 0 | Clean |
| TEPATITLAN MOBILE HOME PARK | 42 | 1 | Health |
| PINE KNOB SUBDIVISION | 39 | 1 | Health |
| KING RANCH NORIAS | 34 | 0 | Clean |
| QUALITY MOBILE HOME PARK | 30 | 0 | Clean |
| NEW PROGRESS WSC ENCHANTED LAKES SUBDIVI | 30 | 0 | Clean |
| WALLER COUNTY MUD 19 | 27 | 0 | Clean |
| MEADOWS AT CYPRESS CREEK WATER PLANT | 25 | 0 | Clean |
| HARRIS COUNTY MUD 491 | 25 | 0 | Clean |
| EAST HOUSTON AT PINEY WOODS MHP | 25 | 0 | Clean |
| FORT BEND COUNTY MUD 134A | 0 | 0 | Clean |
| NORTH FORT BEND WATER AUTHORITY | 0 | 0 | Clean |
| FORT BEND COUNTY MUD 250 | 0 | 0 | Clean |
| NORTH CHANNEL WATER AUTHORITY | 0 | 1 | Health |
| NORTH HARRIS COUNTY REGIONAL WATER AUTHO | 0 | 0 | Clean |
| WEST HARRIS COUNTY REGIONAL WATER AUTHOR | 0 | 0 | Clean |
| HARRIS COUNTY MUD 418 | 0 | 0 | Clean |
| HARRIS COUNTY MUD 387 | 0 | 0 | Clean |
| HARRIS COUNTY IMPROVEMENT DISTRICT 13 | 0 | 0 | Clean |
| HARRIS COUNTY MUD 570D | 0 | 0 | Clean |
| HARRIS COUNTY MUD 478 WATER PLANT 1 | 0 | 0 | Clean |
| RIVER RANCH MUD 1 | 0 | 0 | Clean |
| EAST MONTGOMERY COUNTY MUD 5 | 0 | 0 | Clean |
| MONTGOMERY COUNTY MUD 157 | 0 | 0 | Clean |
| COLTON MUD 1 | 0 | 0 | Clean |
| MONTGOMERY COUNTY MUD 152C | 0 | 0 | Clean |
| MUNICIPAL GROUNDWATER SOLUTIONS | 0 | 1 | Health |
| HARRIS-WALLER COUNTIES MUD 4 | 0 | 0 | Clean |
| WALLER COUNTY MUD 55 | 0 | 0 | Clean |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| RICE UNIVERSITY | Revised Total Coliform Rule | 2025-11-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-11-01 |
| WILDWOOD MOBILE HOME VILLAGE | Nitrate | 2025-10-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-10-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-09-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-08-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-08-01 |
| WILDWOOD MOBILE HOME VILLAGE | Nitrate | 2025-07-01 |
| WILDWOOD MOBILE HOME VILLAGE | Nitrate | 2025-07-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-07-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-07-01 |
| TIMBER RIDGE SECTION 2 | TTHM | 2025-07-01 |
| TIMBER RIDGE SECTION 2 | TTHM | 2025-07-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-06-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-06-01 |
| CITY OF HOUSTON | Interim Enhanced Surface Water Treatment Rule | 2025-05-01 |
| CITY OF HOUSTON | Interim Enhanced Surface Water Treatment Rule | 2025-05-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-05-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-05-01 |
| GALVESTON COUNTY WCID 19 | TTHM | 2025-04-01 |
| GALVESTON COUNTY WCID 19 | TTHM | 2025-04-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-04-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-04-01 |
| TIMBER RIDGE SECTION 2 | TTHM | 2025-04-01 |
| TIMBER RIDGE SECTION 2 | TTHM | 2025-04-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-03-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-03-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-03-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-02-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-02-01 |
| RAMBLE RIDGE SUBDIVISION | Long Term 2 Enhanced Surface Water Treatment Rule | 2025-02-01 |
| RAMBLE RIDGE SUBDIVISION | Surface Water Treatment Rule | 2025-02-01 |
| GALVESTON COUNTY WCID 19 | TTHM | 2025-01-01 |
| GALVESTON COUNTY WCID 19 | TTHM | 2025-01-01 |
| GALVESTON COUNTY WCID 19 | TTHM | 2025-01-01 |
| CINCO MUD 5 | TTHM | 2025-01-01 |
| CINCO MUD 5 | TTHM | 2025-01-01 |
| LEANING OAK MOBILE HOME PARK | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| MUNICIPAL GROUNDWATER SOLUTIONS | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| MAR LYNN SUBDIVISION | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| HIGHLAND LAKES | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| NEW PROGRESS WATER SPRING VALLEY | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| NEW PROGRESS WSC ENCHANTED OAKS SUBDIVIS | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| PONDEROSA HILLS SUBDIVISION | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| SPORTSMANS WORLD MUD | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| OAK ACRES MOBILE HOME PARK | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| HAVENSHIRE WATER SYSTEM | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| LAZY LANE MOBILE HOME PARK | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| TEXAS NATIONAL MUD | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| WHITEWING SUBDIVISION | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
What are Houston's health-based records for?
Houston's health-based violation records carry 8 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Long Term 2 Enhanced Surface Water Treatment Rule | 221 | 1 |
| Tthm | 131 | 12 |
| Gross Alpha, Excl. Radon and U | 100 | 6 |
| Lead and Copper Rule Revisions | 63 | 59 |
| Lead and Copper Rule | 60 | 22 |
| Arsenic | 43 | 7 |
| Nitrate | 20 | 1 |
| Revised Total Coliform Rule | 15 | 7 |
TRI Facilities in Houston
| Facility | Total Releases |
|---|---|
| Valero Refining - Texas L.P. Houston Refinery | 9.4M lbs |
| Sasol Chemicals (usa) LLC | 6.2M lbs |
| Huntsman International LLC | 2.9M lbs |
| Metalplate Galvanizing LP | 1.8M lbs |
| Metalplate Galvanizing LP | 1.8M lbs |
| Houston Refining LP | 1.6M lbs |
| Enduro Composites Inc.-Houston Central Green Facility | 1.3M lbs |
| Southwest Galvanizing Inc | 1.2M lbs |
| The Goodyear Tire & Rubber Co | 1.0M lbs |
| International Paint LLC | 652.2K lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Houston, Texas? ▼
Houston is listed with 734 EPA-regulated water systems covering approximately 5,960,800 people. 694 health-based violation records appear in the extract. A past registry row is not a current drinkability verdict; contact the local utility for current status.
How many water violations does Houston have in this EPA extract? ▼
Houston water systems have 694 health-based violation records in PlainEnviro's EPA SDWIS extract. This extract is filtered to EPA health-based records and does not include monitoring or reporting violations.
What contaminants were found in Houston water? ▼
Health-based records for Houston water systems carry the following EPA contaminant codes: Revised Total Coliform Rule, Long Term 2 Enhanced Surface Water Treatment Rule, Nitrate, TTHM, Interim Enhanced Surface Water Treatment Rule and 12 others. This source edition does not include authoritative contaminant names. Source: EPA SDWIS.
How many water systems serve Houston? ▼
734 EPA-regulated community water systems serve Houston, Texas, collectively covering approximately 5,960,800 people. Data is from the EPA Safe Drinking Water Information System (SDWIS).
Where does Houston get its drinking water? ▼
Houston's water supply comes from 734 EPA-regulated community water systems. Source type data is not available for all systems. For detailed supply information, contact your local water utility. Source: EPA SDWIS.
Are there pollution sources near Houston? ▼
Yes, 251 EPA Toxic Release Inventory (TRI) facilities are registered in Houston, Texas, reporting a combined 37.0M lbs of toxic chemical releases. TRI data reflects self-reported emissions; it does not measure exposure or health effects. Source: EPA TRI.
How does Houston compare in Texas?
Of the 1,232 Texas places with at least one community water system on file, Houston ranks #1 by number of systems (734).
About This Data
Figures here are the current EPA SDWIS extract joined to the 734 community water systems whose service area lists Houston, ranked against the 1,232 Texas places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from U.S. EPA environmental datasets. See our methodology for details. Retrieved and formatted by PlainEnviro