ZIP Code 02482
High RiskPFAS above EPA limits detected
5 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.
12
PFAS Detected
5
Above EPA Limits
2
Water Systems
933%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 933% of limit
Detected: 37.30 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 358% of limit
Detected: 14.30 ppt
PFHxS Exceeds EPA limit
0 ppt MCL: 10 ppt 112% of limit
Detected: 11.20 ppt
NATICK WATER DEPARTMENT
MA3198000 High RiskWater Type
Groundwater
PFAS Detected
6
Above MCL
3
State
Massachusetts
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 37.30ppt | 933% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 14.30ppt | 358% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 11.20ppt | 112% of limit
| 10 ppt | ⚠ Exceeds MCL |
PFBS Perfluorobutane sulfonic acid | 6.50ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 5.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 3.50ppt | No federal limit | — | Unregulated |
WELLESLEY WATER DIVISION
MA3317000 High RiskWater Type
Groundwater
PFAS Detected
6
Above MCL
2
State
Massachusetts
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 6.60ppt | 165% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 6.30ppt | 158% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFBS Perfluorobutane sulfonic acid | 5.30ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 5.20ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 4.30ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 3.90ppt | No federal limit | — | Unregulated |
Note: ZIP code 02482 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.