Washington, DC 20001 · Utility tests 2013–2023
Washington’s tap water has 37 contaminants, 14 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
- 14of 37 found
- Linked to cancer
- 11above guideline
- In the SGS test program
- 6of 37 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: 42.4 ppb
Health guideline: 0.06 ppb
707×Removed by RO
Level found: 31.4 ppb
Health guideline: 0.1 ppb
314×Removed by RO
Level found: 46.4 ppb
Health guideline: 0.15 ppb
310×Removed by RO
Level found: 11.9 ppb
Health guideline: 0.06 ppb
198×Removed by RO
Level found: 3.57 ppb
Health guideline: 0.02 ppb
179×Removed by RO
Level found: 14.7 ppb
Health guideline: 0.1 ppb
147×Removed by RO
Level found: 31.4 ppb
Health guideline: 0.4 ppb
79×Removed by RO
Level found: 14.9 ppb
Health guideline: 0.2 ppb
75×Removed by RO
Level found: 3.08 ppb
Health guideline: 0.1 ppb
31×Removed by RO
Level found: 0.109 ppb
Health guideline: 0.004 ppb
27×Tested · >97.2%
10 of 37 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 20001. 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 Washington’s water that were in that program.
- Arsenic>97.2%Maximum measured reduction
- Nitrate>99.9%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.