PFAS in South Dennis, MA Drinking Water
PFAS data for South Dennis, Massachusetts · 65,000 residents · 1 ZIP code
People in South Dennis, Massachusetts who get water from the public supply are among residents whose systems have returned PFAS detections in EPA compliance testing.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14
PFAS in South Dennis Tap Water
PFAS has been detected in South Dennis, Massachusetts drinking water at a maximum level of 0.0056 ppt — below the EPA MCL of 4 ppt (PFOA/PFOS individually).
This analysis covers 65,000 residents across 1 ZIP code in South Dennis.
South Dennis's overall water quality grade is B (78/100).
Is PFAS in South Dennis Water Safe?
PFAS was detected in South Dennis water but currently falls within EPA limits. However, some health organizations argue the EPA MCL may not be protective enough.
If you are concerned, a reverse osmosis or granular activated carbon filter can reduce pfas levels further.
PFAS Levels by ZIP Code
| ZIP Code | PFAS Level | EPA Limit | Status |
|---|---|---|---|
| 02660 | 2 detections | 4 ppt (PFOA/PFOS individually) | OK |
Average pfas level across South Dennis: 2 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 South Dennis 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.