PFAS in Sammamish, WA Drinking Water
PFAS data for Sammamish, Washington · 56,081 residents · 2 ZIP codes
ZipCheckup's reading of PFAS in Sammamish, Washington: the highest detected level is 0.0165 ppt; the EPA limit is 4 ppt (PFOA/PFOS individually). PFAS carries a high health-risk designation.
Across Sammamish, Washington, federal monitoring data has captured PFAS in water samples at detectable concentrations in the most recent available reporting cycle.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-07-13
PFAS in Sammamish Tap Water
PFAS has been detected in Sammamish, Washington drinking water at a maximum level of 0.0165 detections — relative to the EPA MCL of 4 ppt (PFOA/PFOS individually).
This analysis covers 56,081 residents across 2 ZIP codes in Sammamish.
Sammamish's overall water quality grade is A (88/100).
Is PFAS in Sammamish Water Safe?
If you live in an affected ZIP code, consider installing a reverse osmosis or granular activated carbon filter certified under NSF 53 / NSF 58 and testing your water independently.
PFAS Levels by ZIP Code
| ZIP Code | PFAS Level | EPA Limit | Status |
|---|---|---|---|
| 98074 | 24 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 98075 | 24 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
Average pfas level across Sammamish: 24 ppt
Health Effects of PFAS
- Increased risk of kidney and testicular cancer
- Thyroid disease and immune system suppression
- Reproductive problems and reduced fertility
- Elevated cholesterol and liver effects
- Developmental effects in infants and children
Health risk severity: High. Governed by the PFAS National Primary Drinking Water Regulation (2024).
How PFAS Gets Into Drinking Water
- Firefighting foam (AFFF) used at military bases and airports
- Industrial manufacturing (non-stick coatings, stain-resistant fabrics)
- Wastewater treatment plants that receive industrial discharge
- Landfill leachate from PFAS-containing consumer products
What to Do About PFAS in Sammamish Water
- Install a reverse osmosis system (most effective — removes 90%+ of PFAS)
- Granular activated carbon (GAC) filters remove some PFAS compounds
- Look for NSF 53 or NSF 58 certification specifically tested for PFAS
- Pitcher filters with activated carbon provide partial reduction
Look for filters certified under NSF 53 / NSF 58 for pfas removal.