ZIP Code 19403
High RiskPFAS above EPA limits detected
6 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.
29
PFAS Detected
6
Above EPA Limits
4
Water Systems
1448%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 128% of limit
Detected: 5.10 ppt
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 1448% of limit
Detected: 57.90 ppt
PFNA Exceeds EPA limit
0 ppt MCL: 10 ppt 120% of limit
Detected: 12.00 ppt
NORTH PENN WATER AUTHORITY
PA1460034 High RiskWater Type
Groundwater
PFAS Detected
4
Above MCL
1
State
Pennsylvania
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 5.10ppt | 128% of limit
| 4 ppt | ⚠ Exceeds MCL |
lithium | 23600.00ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 4.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 3.40ppt | No federal limit | — | Unregulated |
PA AMERICAN NORRISTOWN
PA1460046 ModerateWater Type
Surface Water
PFAS Detected
5
Above MCL
0
State
Pennsylvania
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 16200.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 7.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 6.90ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 5.30ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 5.00ppt | No federal limit | — | Unregulated |
AUDUBON WATER COMPANY
PA1460055 High RiskWater Type
Groundwater
PFAS Detected
10
Above MCL
2
State
Pennsylvania
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 57.90ppt | 1448% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 30.80ppt | 770% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFNA Perfluorononanoic acid | 6.60ppt | 66% of limit
| 10 ppt | Below limit |
PFHxS Perfluorohexane sulfonic acid | 5.00ppt | 50% of limit
| 10 ppt | Below limit |
lithium | 24500.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 13.30ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 11.70ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 7.90ppt | No federal limit | — | Unregulated |
Show 2 more compounds detected at low levels
| PFBAPerfluorobutanoic acid | 6.60 ppt | No federal limit |
| PFBSPerfluorobutane sulfonic acid | 5.00 ppt | No federal limit |
AQUA PA MAIN SYSTEM
PA1460073 High RiskWater Type
Surface Water
PFAS Detected
10
Above MCL
3
State
Pennsylvania
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 12.60ppt | 315% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOS Perfluorooctane sulfonic acid | 9.20ppt | 230% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFNA Perfluorononanoic acid | 12.00ppt | 120% of limit
| 10 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 7.70ppt | 77% of limit
| 10 ppt | Below limit |
lithium | 15700.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 21.80ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 17.20ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 10.10ppt | No federal limit | — | Unregulated |
Show 2 more compounds detected at low levels
| PFBSPerfluorobutane sulfonic acid | 9.50 ppt | No federal limit |
| PFHpAPerfluoroheptanoic acid | 6.90 ppt | No federal limit |
Note: ZIP code 19403 is served by 4 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.