Texas water quality
Texas has 7,169 active public water systems (16,244 on file total), 4,615 of them graded by TapGraded.
Grade distribution
Biggest water systems
CITY OF HOUSTON
HOUSTON, TX · 2,970,543 served
SAN ANTONIO WATER SYSTEM
SAN ANTONIO, TX · 2,643,729 served
DALLAS WATER UTILITY
DALLAS, TX · 1,356,479 served
CITY OF AUSTIN WATER & WASTEWATER
AUSTIN, TX · 1,115,323 served
CITY OF FORT WORTH
FORT WORTH, TX · 955,900 served
EL PASO WATER UTILITIES
EL PASO, TX · 747,168 served
CITY OF ARLINGTON
ARLINGTON, TX · 413,955 served
CITY OF CORPUS CHRISTI
CORPUS CHRISTI, TX · 318,387 served
CITY OF PLANO
PLANO, TX · 292,059 served
LUBBOCK PUBLIC WATER SYSTEM
LUBBOCK, TX · 275,041 served
Lowest-graded systems
Active, graded systems serving at least 10,000 people, ordered by lowest Tap Grade first.
CITY OF BIG SPRING
BIG SPRING, TX · 27,282 served
CITY OF PORT LAVACA
PORT LAVACA, TX · 12,000 served
HUDSON WSC
LUFKIN, TX · 10,907 served
CITY OF MIDLAND WATER PURIFICATION PLANT
MIDLAND, TX · 157,000 served
CITY OF BEEVILLE
BEEVILLE, TX · 13,664 served
MANVILLE WSC
COUPLAND, TX · 39,648 served
NUECES COUNTY WCID 3
ROBSTOWN, TX · 14,000 served
CITY OF BAY CITY
BAY CITY, TX · 18,061 served
MAXWELL SUD
MAXWELL, TX · 16,104 served
ORANGE COUNTY WCID 1
VIDOR, TX · 15,258 served
Cities in Texas
Source: EPA SDWIS/ECHO · Data as of 2026Q2