Zip 02108 · Boston, MA · 1 water systems · EWG data 2013–2023

Boston’s tap water has 23 contaminants, 11 above health guidelines.

Water quality score: 5out of 10Fair

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: 11of 23 found

Linked to cancer: 9above guideline

In the SGS test programme: 6of 23 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

- Level found: 16.8 ppb
  Health guideline: 0.06 ppb
  281×
  Removed by RO
- Level found: 14.7 ppb
  Health guideline: 0.1 ppb
  147×
  Removed by RO
- Level found: 17.2 ppb
  Health guideline: 0.15 ppb
  115×
  Removed by RO
- Level found: 11 ppb
  Health guideline: 0.2 ppb
  55×
  Removed by RO
- Level found: 3.25 ppb
  Health guideline: 0.06 ppb
  54×
  Removed by RO
- Level found: 13.1 ppb
  Health guideline: 0.4 ppb
  33×
  Removed by RO
- Level found: 2.02 ppb
  Health guideline: 0.1 ppb
  20×
  Removed by RO
- PFAS
  Level found: 0.832 ppt
  Health guideline: 0.09 ppt
  9.2×
  Tested · >98.8%
- Level found: 0.808 ppb
  Health guideline: 0.1 ppb
  8.1×
  Removed by RO
- PFAS
  Level found: 0.44 ppt
  Health guideline: 0.3 ppt
  1.5×
  Tested · >99%

10 of 23 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 Boston’s water that were in that programme.

Shop Water Purifier Read the lab report

Perfluorooctanoic acid
>98.8%Maximum measured reduction
Perfluorooctane sulfonate
>99%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.