ZIP Code 11746
High RiskPFAS above EPA limits detected
3 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.
14
PFAS Detected
3
Above EPA Limits
3
Water Systems
435%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 435% of limit
Detected: 17.40 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 163% of limit
Detected: 6.50 ppt
PFHxS Exceeds EPA limit
0 ppt MCL: 10 ppt 108% of limit
Detected: 10.80 ppt
GREENLAWN WD
NY5103271 Low LevelWater Type
Groundwater
PFAS Detected
3
Above MCL
0
State
New York
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFHxS Perfluorohexane sulfonic acid | 3.20ppt | 32% of limit
| 10 ppt | Below limit |
6:2 FTS 6:2 Fluorotelomer sulfonic acid | 11.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 3.30ppt | No federal limit | — | Unregulated |
DIX HILLS WATER DISTRICT
NY5103276 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
New York
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFPeA Perfluoropentanoic acid | 4.50ppt | No federal limit | — | Unregulated |
SUFFOLK COUNTY WATER AUTHORITY
NY5110526 High RiskWater Type
Groundwater
PFAS Detected
10
Above MCL
3
State
New York
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 17.40ppt | 435% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 6.50ppt | 163% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 10.80ppt | 108% of limit
| 10 ppt | ⚠ Exceeds MCL |
PFNA Perfluorononanoic acid | 5.70ppt | 57% of limit
| 10 ppt | Below limit |
PFHxA Perfluorohexanoic acid | 43.50ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 39.40ppt | No federal limit | — | Unregulated |
6:2 FTS 6:2 Fluorotelomer sulfonic acid | 23.60ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 12.60ppt | No federal limit | — | Unregulated |
Show 2 more compounds detected at low levels
| PFHpAPerfluoroheptanoic acid | 9.60 ppt | No federal limit |
| PFBSPerfluorobutane sulfonic acid | 5.20 ppt | No federal limit |
Note: ZIP code 11746 is served by 3 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.