San Francisco, CA 94102 · Utility tests 2013–2023
San Francisco’s tap water has 27 contaminants, 13 above health guidelines.
- Water quality score
- 4out of 10Poor
Counts contaminants above an EWG health guideline, weighted by the harm the guideline protects against. 8 and above is good; 5 and above is fair.
- Above a health guideline
- 13of 27 found
- Linked to cancer
- 12above guideline
- In the SGS test program
- 7of 27 found
Contaminants found here that SGS measured the Sans Water Purifier against.
Water data: EWG Tap Water Database, utility test results 2013–2023. Guidelines are EWG health guidelines set by federal or state public-health authorities; legal limits differ.
What’s in the water
Level found: 39.5 ppb
Health guideline: 0.06 ppb
658×Removed by RO
Level found: 34.4 ppb
Health guideline: 0.1 ppb
344×Removed by RO
Level found: 33.2 ppb
Health guideline: 0.15 ppb
222×Removed by RO
Level found: 9.57 ppb
Health guideline: 0.1 ppb
96×Removed by RO
Level found: 17.1 ppb
Health guideline: 0.2 ppb
86×Removed by RO
Level found: 30.4 ppb
Health guideline: 0.4 ppb
76×Removed by RO
Level found: 2.33 ppb
Health guideline: 0.06 ppb
39×Removed by RO
Level found: 3.28 ppm
Health guideline: 0.14 ppm
23×Tested · >99.9%
Level found: 2.95 ppm
Health guideline: 0.14 ppm
21×Removed by RO
Level found: 0.0788 ppb
Health guideline: 0.004 ppb
20×Tested · >97.2%
10 of 27 contaminants
Tested: measured by SGS on the Sans Water Purifier, the lab’s own figure. Removed by RO: listed by EWG as reduced by reverse osmosis, the purifier’s filter type. Not tested: neither.
Where this report applies
Utilities serving zip 94102. Map data © OpenStreetMap contributors.
What the Sans Water Purifier is tested to reduce
SGS, an ISO/IEC 17025 laboratory, measured the purifier’s reduction of 19 contaminants (Dec 2023 to Mar 2024). These are the worst in San Francisco’s water that were in that program.
- Nitrate>99.9%Maximum measured reduction
- Arsenic>97.2%Maximum measured reduction
- Hexavalent chromium98.6%Maximum measured reduction
Figures are the laboratory’s own, measured under test conditions. Your tap water differs from the challenge water.