Houston

Houston, TX receives a water quality score of 95/100 (Grade A) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 530 public water systems serving the area.

Houston's water quality is above the national average, with strong compliance records and low contaminant levels. Residents generally receive clean, safe tap water that meets EPA standards.

Houston's score of 95 is 19 points above the Texas state average of 76, and above the nationwide average of roughly 78/100 across all U.S. states.

Families moving to the Houston major metro area can be encouraged by the highly favorable water quality ratings achieved across this Texas region's hundreds of individual public water systems. Because this South-central community is situated among large urban centers with varied geology and a prominent oil and gas industry, local water managers must navigate complex environmental and industrial influences. The excellent collective performance across these utilities indicates that treatment protocols are successfully safeguarding household tap water throughout the metropolitan area.

Water quality data is sourced from the U.S. EPA SDWIS database and updated quarterly. Learn about our scoring methodology → Read our Texas water quality rankings report →