ZIP Code 77520
High RiskPFAS above EPA limits detected
1 compound exceed EPA Maximum Contaminant Levels in water serving this ZIP code. Standard pitcher filters like Brita do not remove PFAS. See filter recommendations below.
13
PFAS Detected
1
Above EPA Limits
2
Water Systems
150%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 150% of limit
Detected: 6.00 ppt
CITY OF BAYTOWN
TX1010003 High RiskWater Type
Surface Water
PFAS Detected
8
Above MCL
1
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 6.00ppt | 150% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 5.10ppt | 51% of limit
| 10 ppt | Below limit |
lithium | 13800.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 14.60ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 10.20ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 9.80ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 5.70ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 3.70ppt | No federal limit | — | Unregulated |
EXXON MOBIL BAYTOWN REFINERY
TX1011562 ModerateWater Type
Surface Water
PFAS Detected
5
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFHxS Perfluorohexane sulfonic acid | 3.20ppt | 32% of limit
| 10 ppt | Below limit |
PFBA Perfluorobutanoic acid | 9.20ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 7.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 5.70ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 5.70ppt | No federal limit | — | Unregulated |
Note: ZIP code 77520 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.