Round Rock, TX 78664
3 water systems • 130,872 residents
Moderate water quality - consider filtration
Score: 49/100
Graded on EPA violations, contaminants, severity, compliance, and enforcement history. See methodology.
Data updated June 2026 • Sources: EPA ECHO and EPA Envirofacts
11
Contaminants Detected
265
Violations on Record
31
Health-Based Violations
0
Recent Violations
Grade Breakdown
49 / 100 points
Recommended Water Filters
- ✓Point-of-Use Carbon Filter (NSF-certified for lead)
- ✓Reverse Osmosis or Ion Exchange Filter
- ✓Ultraviolet (UV) Purification
- ✓Activated Carbon Filter (disinfection byproducts)
Consult a water quality specialist for personalized recommendations.
Round Rock vs TX & National Average
Detected Contaminants
11 contaminants detected across water systems serving this ZIP code
| Contaminant | Category |
|---|---|
| Nitrate | Agricultural |
| Total Haloacetic Acids (HAA5) | Disinfection Byproduct |
| Lead and Copper Rule | Heavy Metal |
| LEAD AND COPPER RULE REVISIONS | Heavy Metal |
| Coliform (TCR) | Microorganism |
| Revised Total Coliform Rule | Microorganism |
| Chlorine | Other |
| Consumer Confidence Rule | Other |
| Interim Enhanced Surface Water Treatment Rule | Other |
| Public Notice | Other |
| Surface Water Treatment Rule | Other |
Water System Information
- Systems Serving This ZIP:
- NAMELESS HOLLOW CONDOMINIUMS, CITY OF ROUND ROCK, BRUSHY CREEK REGIONAL UTILITY AUTHORITY
- Population Served:
- 130,872
- Systems With Violations:
- 3 of 3
- Major Violations:
- 15
- Enforcement Actions:
- 264
Frequently Asked Questions
What does the grade mean?
Our A–F grade ranks this ZIP code's water quality against every other analyzed ZIP in the country, based on EPA data. A = among the best, F = among the most troubled.
Is my tap water safe to drink?
Water systems regulated by the EPA must comply with Safe Drinking Water Act standards. However, if you're concerned about water quality, consider a water filter appropriate for your contaminants.
How often is the data updated?
We update our data quarterly with the latest EPA ECHO and Envirofacts data. Historical violations are tracked to identify patterns.
What filters do you recommend?
Filter recommendations are based on detected contaminants in your area. See our Filter Guide for detailed information about different filter types.