Zip 98101 · Seattle, WA · 1 water systems · EWG data 2013–2023
Seattle’s tap water has 17 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 17 found
- Linked to cancer
- 9above guideline
- In the SGS test programme
- 3of 17 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.
Level found: 27.3 ppb
Health guideline: 0.06 ppb
455×Removed by RO
Level found: 28.9 ppb
Health guideline: 0.1 ppb
289×Removed by RO
Level found: 28.7 ppb
Health guideline: 0.15 ppb
192×Removed by RO
Level found: 14.9 ppb
Health guideline: 0.1 ppb
149×Removed by RO
Level found: 27 ppb
Health guideline: 0.4 ppb
68×Removed by RO
Level found: 12.7 ppb
Health guideline: 0.2 ppb
64×Removed by RO
Level found: 1.69 ppb
Health guideline: 0.06 ppb
28×Removed by RO
Level found: 0.71 pCi/L
Health guideline: 0.05 pCi/L
14×Removed by RO
Level found: 0.116 ppb
Health guideline: 0.02 ppb
5.8×Tested · 98.6%
Level found: 0.352 ppb
Health guideline: 0.1 ppb
3.5×Removed by RO
10 of 17 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 98101. 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 Seattle’s water that were in that programme.
- Hexavalent chromium98.6%Maximum measured reduction
- Nitrate>99.9%Maximum measured reduction
- Chlorate>99.8%Maximum measured reduction
Figures are the laboratory’s own, measured under test conditions. Your tap water differs from the challenge water.