San Francisco, California Water Quality Report
Water quality data for 17 water systems serving 7,885 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| PFBA | 0.006 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFBS | 0.005 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHpA | 0.003 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxA | 0.007 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxS | 0.005 | 0.010 ug/L | 0.001 ug/L(EWG) | 46% | Within limit |
| PFOA | 0.004 | 0.004 ug/L | 0.090 ug/L(EWG) | 100% | Near limit |
| PFPeA | 0.009 | 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 (7)
45
Dec 31, 2023
45
Dec 31, 2023
45
Dec 31, 2023
45
Dec 31, 2023
45
Dec 31, 2023
45
Dec 31, 2023
42
Jul 29, 2020
Resolved Violations (493)
3A
Jul 1, 2025 — Jul 31, 2025
3A
Jul 1, 2025 — Jul 31, 2025
12
Feb 1, 2025
12
Feb 1, 2025
12
Feb 1, 2025
+ 488 more resolved violations
Frequently Asked Questions
Is San Francisco tap water safe to drink?
San Francisco's water meets all EPA maximum contaminant levels. However, 7 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in San Francisco tap water?
7 contaminants have been detected in San Francisco's water supply across 17 water systems. See the full contaminant table above for details.
How can I improve my water quality in San Francisco?
Install a water filter rated for the specific contaminants found in San Francisco'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 Francisco have any water quality violations?
Yes, San Francisco currently has 45 active violations. See the violations section above for details.