San Marcos, Texas Water Quality Report
Water quality data for 11 water systems serving 137,378 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 11.3 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 113% | Above guideline |
| PFBA | 0.011 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxS | 0.003 | 0.010 ug/L | 0.001 ug/L(EWG) | 34% | Within limit |
| PFPeA | 0.004 | 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
Resolved Violations (500)
27
Feb 1, 2021 — Feb 28, 2021
27
Feb 1, 2021 — Feb 28, 2021
27
Feb 1, 2021 — Feb 28, 2021
27
Feb 1, 2021 — Feb 28, 2021
66
Dec 30, 2019
+ 495 more resolved violations
Frequently Asked Questions
Is San Marcos tap water safe to drink?
San Marcos's water meets all EPA maximum contaminant levels. However, 4 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in San Marcos tap water?
4 contaminants have been detected in San Marcos's water supply across 11 water systems. See the full contaminant table above for details.
How can I improve my water quality in San Marcos?
Install a water filter rated for the specific contaminants found in San Marcos's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does San Marcos have any water quality violations?
Yes, San Marcos currently has 35 active violations. See the violations section above for details.