ZIP Code 19971
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.
16
PFAS Detected
4
Above EPA Limits
3
Water Systems
373%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 373% of limit
Detected: 14.90 ppt
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 155% of limit
Detected: 6.20 ppt
REHOBOTH BEACH WATER DEPARTMENT
DE0000723 High RiskWater Type
Groundwater
PFAS Detected
7
Above MCL
2
State
Delaware
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 14.90ppt | 373% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOS Perfluorooctane sulfonic acid | 6.20ppt | 155% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 6.90ppt | 69% of limit
| 10 ppt | Below limit |
PFBS Perfluorobutane sulfonic acid | 7.20ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 6.20ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 4.40ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 3.10ppt | No federal limit | — | Unregulated |
DEWEY BEACH WATER DEPARTMENT
DE0000825 High RiskWater Type
Groundwater
PFAS Detected
5
Above MCL
1
State
Delaware
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 11.00ppt | 275% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 3.50ppt | 35% of limit
| 10 ppt | Below limit |
PFBS Perfluorobutane sulfonic acid | 5.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.20ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 3.80ppt | No federal limit | — | Unregulated |
REHOBOTH PUMP DISTRICT
DE0000991 High RiskWater Type
Groundwater
PFAS Detected
4
Above MCL
1
State
Delaware
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 4.40ppt | 110% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFPeA Perfluoropentanoic acid | 9.40ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 6.60ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 5.80ppt | No federal limit | — | Unregulated |
Note: ZIP code 19971 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.