ZIP Code 27520
High RiskPFAS above EPA limits detected
5 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.
18
PFAS Detected
5
Above EPA Limits
3
Water Systems
353%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 205% of limit
Detected: 8.20 ppt
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 203% of limit
Detected: 8.10 ppt
CLAYTON, TOWN OF
NC0351020 High RiskWater Type
Surface Water
PFAS Detected
5
Above MCL
2
State
North Carolina
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 8.20ppt | 205% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOS Perfluorooctane sulfonic acid | 8.10ppt | 203% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFPeA Perfluoropentanoic acid | 6.40ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 5.90ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 4.00ppt | No federal limit | — | Unregulated |
JOHNSTON CO-WEST
NC0351070 High RiskWater Type
Surface Water
PFAS Detected
8
Above MCL
2
State
North Carolina
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 14.10ppt | 353% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 7.60ppt | 190% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 5.30ppt | 53% of limit
| 10 ppt | Below limit |
PFBA Perfluorobutanoic acid | 15.60ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 9.20ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 9.20ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 5.00ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 4.50ppt | No federal limit | — | Unregulated |
RALEIGH, CITY OF
NC0392010 High RiskWater Type
Surface Water
PFAS Detected
5
Above MCL
1
State
North Carolina
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 5.60ppt | 140% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFBA Perfluorobutanoic acid | 9.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 4.30ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.20ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 3.30ppt | No federal limit | — | Unregulated |
Note: ZIP code 27520 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.