Safest Drinking Water in Texas 2026
Texas has 5 public water systems serving 4,242,421 people. The safest system is Dallas Water Utility in Dallas with a score of 100/100.
Top 5 Water Systems in Texas
| # | Water System | City | Pop. Served | Source | Violations | Score |
|---|---|---|---|---|---|---|
| 1 | Dallas Water Utility | Dallas | 1,356,479 | Surface water | 0 | A (100) |
| 2 | City of Plano | Plano | 292,059 | Surface water | 0 | A (100) |
| 3 | City of Frisco | Frisco | 231,910 | Surface water | 0 | A (100) |
| 4 | San Antonio Water System | San Antonio | 2,113,151 | Surface water | 0 | B (80) |
| 5 | City of Garland | Garland | 248,822 | Surface water | 0 | B (80) |
Water quality data for Texas is sourced from the EPA Safe Drinking Water Information System (SDWIS), which tracks compliance for all public water systems.
Frequently Asked Questions
Dallas Water Utility in Dallas has the highest Water Safety Score in Texas at 100/100 (Grade A), serving 1,356,479 people.
Texas has 5 public water systems serving 4,242,421 people. The average Water Safety Score is 92/100.
The Water Safety Score (0-100) is based on health violations (40%), contaminant exceedances (30%), enforcement history (20%), and monitoring violations (10%). Higher scores mean cleaner, safer water.
Water Safety Score: health violations (40%), contaminant exceedances (30%), enforcement history (20%), monitoring violations (10%).
The this entity category groups every U.S. public drinking-water safety entity sharing this attribute. The list above is the data; the paragraphs below explain what the grouping means against the broader the EPA Safe Drinking Water Information System (SDWIS) distribution and how to read the relative rankings within the category.
For readers using this category as a starting point, the per-entity detail pages linked from the table above carry the underlying the EPA Safe Drinking Water Information System (SDWIS) data in full. The category-level view is the filter; the per-entity pages are the actual answer.
Source: EPA Ground Water and Drinking Water, 2026.