ZIP Code 06410
High RiskPFAS above EPA limits detected
4 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
4
Above EPA Limits
2
Water Systems
348%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 238% of limit
Detected: 9.50 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 153% of limit
Detected: 6.10 ppt
PFHxS Exceeds EPA limit
0 ppt MCL: 10 ppt 107% of limit
Detected: 10.70 ppt
MERIDEN WATER DIVISION
CT0800011 High RiskWater Type
Groundwater
PFAS Detected
7
Above MCL
2
State
Connecticut
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 9.50ppt | 238% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 6.10ppt | 153% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 4.00ppt | 40% of limit
| 10 ppt | Below limit |
PFHxA Perfluorohexanoic acid | 5.80ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 5.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 4.80ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 3.70ppt | No federal limit | — | Unregulated |
WALLINGFORD WATER DEPARTMENT
CT1480011 High RiskWater Type
Groundwater
PFAS Detected
3
Above MCL
2
State
Connecticut
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 13.90ppt | 348% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 10.70ppt | 107% of limit
| 10 ppt | ⚠ Exceeds MCL |
PFBS Perfluorobutane sulfonic acid | 4.00ppt | No federal limit | — | Unregulated |
Note: ZIP code 06410 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.