ZIP Code 19335
High RiskPFAS above EPA limits detected
11 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.
44
PFAS Detected
11
Above EPA Limits
7
Water Systems
315%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 105% of limit
Detected: 4.20 ppt
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 178% of limit
Detected: 7.10 ppt
PFNA Exceeds EPA limit
0 ppt MCL: 10 ppt 120% of limit
Detected: 12.00 ppt
DOWNINGTOWN WATER AUTHORITY
PA1150026 High RiskWater Type
Surface Water
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 | 4.20ppt | 105% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFBS Perfluorobutane sulfonic acid | 3.80ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 3.40ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 3.10ppt | No federal limit | — | Unregulated |
AQUA PA UWCHLAN
PA1150035 High RiskWater Type
MX
PFAS Detected
6
Above MCL
2
State
Pennsylvania
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 9.30ppt | 233% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOS Perfluorooctane sulfonic acid | 7.10ppt | 178% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFPeA Perfluoropentanoic acid | 7.70ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 6.70ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 5.70ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 5.10ppt | No federal limit | — | Unregulated |
AQUA PA SPRING RUN
PA1150089 High RiskWater Type
Surface Water
PFAS Detected
9
Above MCL
2
State
Pennsylvania
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 6.80ppt | 170% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOS Perfluorooctane sulfonic acid | 4.40ppt | 110% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFNA Perfluorononanoic acid | 5.20ppt | 52% of limit
| 10 ppt | Below limit |
PFHxS Perfluorohexane sulfonic acid | 3.60ppt | 36% of limit
| 10 ppt | Below limit |
PFPeA Perfluoropentanoic acid | 8.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 7.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 6.30ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 5.60ppt | No federal limit | — | Unregulated |
Show 1 more compound detected at low levels
| PFHpAPerfluoroheptanoic acid | 4.20 ppt | No federal limit |
AQUA PA WEST CHESTER
PA1150098 High RiskWater Type
Groundwater
PFAS Detected
5
Above MCL
1
State
Pennsylvania
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 5.90ppt | 148% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFPeA Perfluoropentanoic acid | 7.40ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 7.20ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 5.70ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 3.60ppt | No federal limit | — | Unregulated |
PA AMERICAN COATESVILLE
PA1150106 Low LevelWater Type
Surface Water
PFAS Detected
2
Above MCL
0
State
Pennsylvania
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFBA Perfluorobutanoic acid | 5.50ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 3.20ppt | No federal limit | — | Unregulated |
AQUA PA FRIENDSHIP
PA1150137 High RiskWater Type
Surface Water
PFAS Detected
8
Above MCL
2
State
Pennsylvania
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 | 7.70ppt | 193% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 3.00ppt | 30% of limit
| 10 ppt | Below limit |
PFBS Perfluorobutane sulfonic acid | 8.50ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 7.20ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 7.10ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 5.60ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 3.00ppt | No federal limit | — | Unregulated |
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 19335 is served by 7 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.