PFAS in Portsmouth, NH Drinking Water
PFAS data for Portsmouth, New Hampshire · 44,142 residents · 4 ZIP codes
Federal water monitoring extends to thousands of public water systems, and in Portsmouth, New Hampshire, 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: 2026-05-14
PFAS in Portsmouth Tap Water
PFAS has been detected in Portsmouth, New Hampshire drinking water at a maximum level of 63 ppt — 15.75x the EPA MCL.
This analysis covers 44,142 residents across 4 ZIP codes in Portsmouth.
Portsmouth's overall water quality grade is C (66/100).
Is PFAS in Portsmouth 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 |
|---|---|---|---|
| 03801 | 63 ppt | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 03802 | 63 ppt | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 03803 | 63 ppt | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 03804 | 63 ppt | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 03801 | 31 detections | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
Average pfas level across Portsmouth: 56.6 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 Portsmouth 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.