ZIP Code 29455
High RiskPFAS above EPA limits detected
8 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.
21
PFAS Detected
8
Above EPA Limits
4
Water Systems
213%
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 110% of limit
Detected: 4.40 ppt
CHARLESTON WATER SYSTEM (SC1010001)
SC1010001 High RiskWater Type
Surface Water
PFAS Detected
5
Above MCL
2
State
South Carolina
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 | 4.40ppt | 110% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFPeA Perfluoropentanoic acid | 4.70ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.30ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 3.80ppt | No federal limit | — | Unregulated |
KIAWAH ISLAND UTILITY (SC1010008)
SC1010008 High RiskWater Type
Surface Water
PFAS Detected
6
Above MCL
2
State
South Carolina
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 7.90ppt | 198% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 4.50ppt | 113% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFBA Perfluorobutanoic acid | 8.70ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 7.60ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.90ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 3.70ppt | No federal limit | — | Unregulated |
SEABROOK ISLAND TOWN OF (1010009)
SC1010009 High RiskWater Type
Surface Water
PFAS Detected
5
Above MCL
2
State
South Carolina
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 7.50ppt | 188% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 5.00ppt | 125% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFPeA Perfluoropentanoic acid | 7.80ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.80ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 3.40ppt | No federal limit | — | Unregulated |
ST JOHN'S WATER (SC1020002)
SC1020002 High RiskWater Type
Surface Water
PFAS Detected
5
Above MCL
2
State
South Carolina
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 8.50ppt | 213% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 5.40ppt | 135% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFPeA Perfluoropentanoic acid | 5.60ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.90ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 4.50ppt | No federal limit | — | Unregulated |
Note: ZIP code 29455 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.