San Jose, California Water Quality Report
Water quality data for 87 water systems serving 3,392,750 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 81.3 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 813% | Above guideline |
| PFBA | 0.028 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFBS | 0.010 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHpA | 0.005 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxA | 0.015 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxS | 0.022 | 0.010 ug/L | 0.001 ug/L(EWG) | 221% | Above limit |
| PFNA | 0.005 | 0.010 ug/L | — | 47% | Within limit |
| PFOA | 0.009 | 0.004 ug/L | 0.090 ug/L(EWG) | 232% | Above limit |
| PFOS | 0.022 | 0.004 ug/L | 0.300 ug/L(EWG) | 563% | Above limit |
| PFPeA | 0.034 | 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 (10)
4H
Jul 2, 2025
4G
Oct 17, 2024
2E
Oct 17, 2024
4G
Oct 17, 2024
4G
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
52
Jul 1, 2024
51
Jul 1, 2019
51
Jan 1, 2018
Resolved Violations (990)
75
Jun 30, 2025
75
Jun 30, 2025
66
Dec 30, 2024
66
Dec 30, 2024
2E
Oct 17, 2024
+ 985 more resolved violations
Frequently Asked Questions
Is San Jose tap water safe to drink?
San Jose's water has 3 contaminants detected above EPA limits. While the water is treated, residents may want to consider additional filtration.
What contaminants are in San Jose tap water?
10 contaminants have been detected in San Jose's water supply across 87 water systems. See the full contaminant table above for details.
How can I improve my water quality in San Jose?
Install a water filter rated for the specific contaminants found in San Jose'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 Jose have any water quality violations?
Yes, San Jose currently has 110 active violations. See the violations section above for details.