ZIP Code 20837
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.
11
PFAS Detected
2
Above EPA Limits
2
Water Systems
163%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 163% of limit
Detected: 6.50 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 135% of limit
Detected: 5.40 ppt
TOWN OF POOLESVILLE
MD0150002 High RiskWater Type
Groundwater
PFAS Detected
9
Above MCL
2
State
Maryland
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 6.50ppt | 163% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 5.40ppt | 135% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 6.90ppt | 69% of limit
| 10 ppt | Below limit |
lithium | 41100.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 15.10ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 9.80ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 8.90ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 5.40ppt | No federal limit | — | Unregulated |
Show 1 more compound detected at low levels
| PFBSPerfluorobutane sulfonic acid | 4.80 ppt | No federal limit |
WASHINGTON SUBURBAN SANITARY COMMISSION
MD0150005 Low LevelWater Type
Surface Water
PFAS Detected
2
Above MCL
0
State
Maryland
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFPeA Perfluoropentanoic acid | 6.70ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.80ppt | No federal limit | — | Unregulated |
Note: ZIP code 20837 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.