ZIP Code 03801
High RiskPFAS above EPA limits detected
2 compounds exceed EPA Maximum Contaminant Levels in water serving this ZIP code. Standard pitcher filters like Brita do not remove PFAS. See filter recommendations below.
10
PFAS Detected
2
Above EPA Limits
2
Water Systems
175%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 175% of limit
Detected: 7.00 ppt
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 125% of limit
Detected: 5.00 ppt
PORTSMOUTH WATER WORKS
NH1951010 High RiskWater Type
Surface Water
PFAS Detected
9
Above MCL
2
State
New Hampshire
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 7.00ppt | 175% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOS Perfluorooctane sulfonic acid | 5.00ppt | 125% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 5.00ppt | 50% of limit
| 10 ppt | Below limit |
lithium | 10000.00ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 9.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 7.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 6.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 5.00ppt | No federal limit | — | Unregulated |
Show 1 more compound detected at low levels
| PFHpAPerfluoroheptanoic acid | 3.00 ppt | No federal limit |
PEASE TRADE PORT
NH1951020 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
New Hampshire
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFBA Perfluorobutanoic acid | 15.10ppt | No federal limit | — | Unregulated |
Note: ZIP code 03801 is served by 2 separate water utilities.
Results above show data for each system independently.
Data source: EPA Unregulated Contaminant Monitoring Rule, 5th cycle (UCMR 5) — January 2026 release.
UCMR 5 tested ~10,000 public water systems serving more than 25 people between 2023-2025 for 29 PFAS compounds.
Detection values represent the highest single-sample result measured at entry points to the distribution system.