Houston, TX water quality

Houston, TX is served by 724 public water systems, serving 5,249,575 people combined. Across those systems, we count 180 health-based violations in the last 5 years. The worst Tap Grade among them is D.

Water systems serving Houston

Showing the 100 largest by population served, of 724 systems serving Houston.

CITY OF HOUSTON

HOUSTON, TX · 2,970,543 served

CLEAR LAKE CITY WATER AUTHORITY

HOUSTON, TX · 89,702 served

CITY OF HOUSTON UD 5 - KINGWOOD

HOUSTON, TX · 80,073 served

HARRIS COUNTY MUD 165

HOUSTON, TX · 40,503 served

NORTHWEST HARRIS COUNTY MUD 5

HOUSTON, TX · 25,425 served

BRIDGESTONE MUD

HOUSTON, TX · 24,528 served

TIMBER LANE UTILITY DISTRICT

HOUSTON, TX · 24,507 served

HARRIS COUNTY FWSD 51

HOUSTON, TX · 19,671 served

CIMARRON MUD

HOUSTON, TX · 19,338 served

HARRIS COUNTY MUD 82

HOUSTON, TX · 18,990 served

NORTHWEST PARK MUD

HOUSTON, TX · 18,168 served

CLEAR BROOK CITY MUD

HOUSTON, TX · 18,108 served

HARRIS MONTGOMERY COUNTIES MUD 386

HOUSTON, TX · 18,018 served

HARRIS COUNTY MUD 53

HOUSTON, TX · 17,856 served

HARRIS COUNTY MUD 26

HOUSTON, TX · 17,178 served

HARRIS COUNTY MUD 71

HOUSTON, TX · 17,079 served

HARRIS COUNTY MUD 167

HOUSTON, TX · 16,761 served

HARRIS COUNTY MUD 55 HERITAGE PARK

HOUSTON, TX · 16,392 served

HARRIS COUNTY FWSD 61

HOUSTON, TX · 15,400 served

HARRIS COUNTY MUD 105

HOUSTON, TX · 14,925 served

HARRIS COUNTY MUD 200 CRANBROOK

HOUSTON, TX · 14,868 served

HARRIS COUNTY MUD 24

HOUSTON, TX · 14,796 served

CNP UTILITY DISTRICT

HOUSTON, TX · 14,718 served

HARRIS COUNTY MUD 285

HOUSTON, TX · 14,268 served

CITY OF HOUSTON WILLOW CHASE

HOUSTON, TX · 14,169 served

MEADOWHILL REGIONAL MUD

HOUSTON, TX · 13,863 served

REMINGTON MUD 1

HOUSTON, TX · 13,746 served

HARRIS COUNTY MUD 120

HOUSTON, TX · 13,197 served

NEWPORT MUD

HOUSTON, TX · 13,191 served

HARRIS COUNTY MUD 157

HOUSTON, TX · 13,062 served

HARRIS COUNTY MUD 1

HOUSTON, TX · 12,342 served

NORTHAMPTON MUD

HOUSTON, TX · 12,162 served

HARRIS COUNTY MUD 368

HOUSTON, TX · 11,835 served

HARRIS COUNTY MUD 153

HOUSTON, TX · 11,781 served

HARRIS COUNTY MUD 81

HOUSTON, TX · 11,514 served

MEMORIAL VILLAGES WATER AUTHORITY

HOUSTON, TX · 11,382 served

HARRIS COUNTY UD 6

HOUSTON, TX · 11,262 served

HARRIS COUNTY WCID 36

HOUSTON, TX · 11,073 served

CYPRESS HILL MUD 1

HOUSTON, TX · 11,052 served

HARRIS COUNTY MUD 49

HOUSTON, TX · 10,893 served

HARRIS COUNTY MUD 278

HOUSTON, TX · 10,584 served

HARRIS COUNTY WCID 96

HOUSTON, TX · 10,530 served

GREENWOOD UTILITY DISTRICT

HOUSTON, TX · 10,527 served

HARRIS COUNTY MUD 489

HOUSTON, TX · 10,476 served

HARRIS COUNTY MUD 230

HOUSTON, TX · 10,404 served

HARRIS COUNTY MUD 102

HOUSTON, TX · 10,401 served

LANGHAM CREEK UTILITY DISTRICT

HOUSTON, TX · 10,377 served

MISSION BEND MUD 2

HOUSTON, TX · 10,155 served

HARRIS COUNTY WCID 109

HOUSTON, TX · 10,134 served

PONDEROSA FOREST UTILITY DISTRICT

HOUSTON, TX · 10,101 served

HARRIS COUNTY WCID 110

HOUSTON, TX · 9,807 served

HARRIS COUNTY MUD 109

HOUSTON, TX · 9,501 served

TRAIL OF THE LAKES MUD

HOUSTON, TX · 9,480 served

HARRIS COUNTY MUD 188

HOUSTON, TX · 9,453 served

HUNTERS GLEN MUD

HOUSTON, TX · 9,405 served

HARRIS-FORT BEND COUNTIES MUD 3

HOUSTON, TX · 9,297 served

HARRIS COUNTY WCID 119

HOUSTON, TX · 9,150 served

HARRIS COUNTY WCID 89

HOUSTON, TX · 9,033 served

BARKER CYPRESS MUD

HOUSTON, TX · 8,976 served

SUNBELT FWSD HIGH MEADOWS SUBDIVISION

HOUSTON, TX · 8,946 served

CHELFORD CITY MUD

HOUSTON, TX · 8,917 served

HARRIS COUNTY MUD 391

HOUSTON, TX · 8,835 served

HARRIS COUNTY MUD 132

HOUSTON, TX · 8,682 served

LYNDON B JOHNSON SPACE CENTER

HOUSTON, TX · 8,530 served

RICE UNIVERSITY

HOUSTON, TX · 8,415 served

JACKRABBIT ROAD PUD

HOUSTON, TX · 8,346 served

HARRIS COUNTY MUD 154

HOUSTON, TX · 8,289 served

HARRIS COUNTY MUD 290

HOUSTON, TX · 8,259 served

WEST HARRIS COUNTY MUD 11

HOUSTON, TX · 8,205 served

BISSONNET MUD

HOUSTON, TX · 8,160 served

WEST PARK MUD

HOUSTON, TX · 8,106 served

ADDICKS UTILITY DISTRICT

HOUSTON, TX · 8,076 served

HARRIS COUNTY MUD 468

HOUSTON, TX · 7,944 served

NORTHWEST HARRIS COUNTY MUD 9

HOUSTON, TX · 7,848 served

NORTHWEST HARRIS COUNTY MUD 12

HOUSTON, TX · 7,764 served

NORTHWEST HARRIS COUNTY MUD 10

HOUSTON, TX · 7,671 served

WESTON MUD

HOUSTON, TX · 7,647 served

HARRIS COUNTY MUD 151

HOUSTON, TX · 7,464 served

CY CHAMP PUD

HOUSTON, TX · 7,428 served

HARRIS COUNTY MUD 419

HOUSTON, TX · 7,389 served

EMERALD FOREST UTILITY DISTRICT

HOUSTON, TX · 7,326 served

PARKWAY UTILITY DISTRICT

HOUSTON, TX · 7,323 served

HARRIS COUNTY MUD 152

HOUSTON, TX · 7,314 served

HARRIS COUNTY MUD 504

HOUSTON, TX · 7,242 served

MALCOMSON ROAD UTILITY DISTRICT

HOUSTON, TX · 7,231 served

HARRIS COUNTY MUD 449

HOUSTON, TX · 7,179 served

WINDFERN FOREST UTILITY DISTRICT

HOUSTON, TX · 7,170 served

LAKE FOREST UTILITY DISTRICT

HOUSTON, TX · 7,106 served

NOTTINGHAM COUNTRY MUD

HOUSTON, TX · 7,089 served

HARRIS COUNTY MUD 196

HOUSTON, TX · 7,026 served

DOWDELL PUD

HOUSTON, TX · 7,002 served

HARRIS COUNTY MUD 96

HOUSTON, TX · 6,993 served

SAGEMEADOW UTILITY DISTRICT

HOUSTON, TX · 6,975 served

REID ROAD MUD 1

HOUSTON, TX · 6,969 served

WEST HARRIS COUNTY MUD 2 CHASE

HOUSTON, TX · 6,921 served

NORTHWEST HARRIS COUNTY MUD 15

HOUSTON, TX · 6,915 served

HARRIS COUNTY MUD 189

HOUSTON, TX · 6,906 served

SUNBELT FWSD OAKWILDE SUBDIVISION

HOUSTON, TX · 6,819 served

HARRIS COUNTY MUD 158

HOUSTON, TX · 6,798 served

HARRIS COUNTY MUD 150

HOUSTON, TX · 6,786 served

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Frequently asked questions

Is Houston, TX tap water safe to drink?

724 public water systems serve Houston, TX, with 180 health-based violations in the last 5 years across them. The worst Tap Grade among them is D. A Tap Grade summarizes public EPA compliance records; it is not a determination that water is safe or unsafe to drink.

Does Houston's water have lead in it?

The most recent 90th-percentile lead sample is 43.8 ppb, versus the EPA action level of 15 ppb.

Has PFAS been detected in Houston's water?

Yes — at least one water system serving Houston has detected PFAS under UCMR5.

Other cities in Texas

San Antonio Dallas Austin Fort Worth El Paso Arlington Corpus Christi Plano

See all of Texas →

Source: EPA SDWIS/ECHO · Data as of 2026Q2

TapGraded presents public EPA data for information only — it is not health advice and not a determination that any water is safe or unsafe to drink. For health concerns, contact your water utility or local health department.