Round Rock, Texas Water Quality Report
Water quality data for 11 water systems serving 161,539 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 16.3 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 163% | Above guideline |
| PFBA | 0.009 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFBS | 0.007 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHxA | 0.004 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxS | 0.004 | 0.010 ug/L | 0.001 ug/L(EWG) | 37% | Within limit |
| PFPeA | 0.007 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
Recommended Water Filters
Based on the contaminants detected in your water supply, these filtration systems are recommended:
Reverse Osmosis (RO)
Reverse osmosis systems remove up to 99% of PFAS compounds. Recommended for homes with detected PFAS.
Up to 99% PFAS removal
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Compliance & Violations
Active Violations (26)
66
Sep 29, 2025
66
Sep 29, 2025
75
May 1, 2025
75
May 1, 2025
75
May 1, 2025
2E
Oct 17, 2024
2E
Oct 17, 2024
4G
Oct 17, 2024
4G
Oct 17, 2024
4G
Oct 17, 2024
4G
Oct 17, 2024
4G
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
72
Jul 2, 2024
72
Jul 2, 2024
66
Dec 30, 2021
66
Dec 30, 2021
75
Oct 1, 2015
75
Oct 1, 2015
75
Oct 1, 2015
65
Dec 1, 2014
65
Dec 1, 2014
65
Dec 1, 2014
65
Dec 1, 2014
Resolved Violations (474)
52
Jan 1, 2025
52
Jan 1, 2025
52
Jan 1, 2025
75
Dec 1, 2024
75
Dec 1, 2024
+ 469 more resolved violations
Frequently Asked Questions
Is Round Rock tap water safe to drink?
Round Rock's water meets all EPA maximum contaminant levels. However, 6 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in Round Rock tap water?
6 contaminants have been detected in Round Rock's water supply across 11 water systems. See the full contaminant table above for details.
How can I improve my water quality in Round Rock?
Install a water filter rated for the specific contaminants found in Round Rock's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Round Rock have any water quality violations?
Yes, Round Rock currently has 58 active violations. See the violations section above for details.