Round Rock Tap Water Quality: Is It Safe to Drink? (2026 Report)

Round Rock, Texas tap water receives a grade of A (80/100), which is considered excellent. Out of 70 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 3 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.

Of the 70 contaminants tested in Round Rock's water supply, the most notable include Copper (90th percentile), Lead (90th percentile), chlorate. 1 contaminant(s) exceed EPA legal limits (MCLs). 3 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.

Yes, Round Rock has 55 EPA violation(s) on record, with the most recent in 2025. Violation types include MR, Other, RPT. 11 of these are health-based violations, which are the most serious category.

Based on EPA data, using a water filter in Round Rock is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.

Round Rock's drinking water is sourced from purchased surface water and supplied by HEADWATERS AT BARTON CREEK and 5 other water system(s). The system serves approximately 159,982 people. Surface water sources include rivers, lakes, and reservoirs.

Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Round Rock's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.

Round Rock's water quality score of 80/100 earns a grade of A, which is considered excellent. This places Round Rock among the better-performing water systems in Texas. Visit our Texas state page to see how all cities in the state compare.

If you have concerns about Round Rock's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (HEADWATERS AT BARTON CREEK) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.