Zip 95101 · San Jose, CA · 68 water systems · EWG data 2013–2023

San Jose’s tap water has 66 contaminants, 26 above health guidelines.

Water quality score: 2out 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: 26of 66 found

Linked to cancer: 17above guideline

In the SGS test programme: 11of 66 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

Worst first. Contaminants Sans has no evidence for come last unless they are above their guideline. Levels are utility averages reported to EWG.

Times the health guideline, on a log scale

Within guideline
Up to 10×
10 to 100×
100 to 1,000×
Over 1,000×

ContaminantLevel foundHealth guidelineTimes the guidelineSans purifier

- PFAS
  Level found: 2.8 ppt
  Health guideline: 0.001 ppt
  2,802×
  Removed by RO
- Level found: 33.2 ppb
  Health guideline: 0.06 ppb
  553×
  Removed by RO
- Level found: 61.9 ppb
  Health guideline: 0.15 ppb
  413×
  Removed by RO
- Level found: 1.6 ppb
  Health guideline: 0.004 ppb
  400×
  Tested · >97.2%
- Level found: 36.2 ppb
  Health guideline: 0.1 ppb
  362×
  Removed by RO
- Level found: 4.95 ppb
  Health guideline: 0.02 ppb
  248×
  Tested · 98.6%
- Level found: 14.8 ppb
  Health guideline: 0.06 ppb
  246×
  Removed by RO
- Level found: 17.3 ppb
  Health guideline: 0.1 ppb
  173×
  Removed by RO
- Level found: 16.9 ppb
  Health guideline: 0.1 ppb
  169×
  Removed by RO
- Level found: 4.8 ppb
  Health guideline: 0.03 ppb
  160×
  Removed by RO

10 of 66 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

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 Jose’s water that were in that programme.

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Arsenic
>97.2%Maximum measured reduction
Hexavalent chromium
98.6%Maximum measured reduction
Nitrate
>99.9%Maximum measured reduction

Figures are the laboratory’s own, measured under test conditions. Your tap water differs from the challenge water.