PFAS in Greenwich, CT Drinking Water
PFAS data for Greenwich, Connecticut · 39,575 residents · 3 ZIP codes
Federal water monitoring extends to thousands of public water systems, and in Greenwich, Connecticut, that tracking has turned up PFAS — the detection is logged in the EPA compliance record and reflects samples collected under routine Safe Drinking Water Act reporting requirements.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-04-05
PFAS in Greenwich Tap Water
PFAS has been detected in Greenwich, Connecticut drinking water at a maximum level of 0.0056 ppt — below the EPA MCL of 4 ppt (PFOA/PFOS individually).
This analysis covers 39,575 residents across 3 ZIP codes in Greenwich.
Greenwich's overall water quality grade is C (59/100).
Is PFAS in Greenwich 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 |
|---|---|---|---|
| 06831 | 26 detections | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 06830 | 21 detections | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
Average pfas level across Greenwich: 23.5 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 Greenwich 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.