ZIP Code 77979
High RiskPFAS above EPA limits detected
4 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.
17
PFAS Detected
4
Above EPA Limits
2
Water Systems
150%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 150% of limit
Detected: 6.00 ppt
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 118% of limit
Detected: 4.70 ppt
CITY OF PORT LAVACA
TX0290002 High RiskWater Type
Surface Water
PFAS Detected
8
Above MCL
2
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 6.00ppt | 150% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOS Perfluorooctane sulfonic acid | 4.70ppt | 118% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 7.20ppt | 72% of limit
| 10 ppt | Below limit |
lithium | 14900.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 16.30ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 14.20ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 10.00ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 6.50ppt | No federal limit | — | Unregulated |
GBRA CALHOUN COUNTY RURAL WATER SYSTEM
TX0290007 High RiskWater Type
Surface Water
PFAS Detected
9
Above MCL
2
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 5.00ppt | 125% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 4.80ppt | 120% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 4.70ppt | 47% of limit
| 10 ppt | Below limit |
lithium | 19300.00ppt | No federal limit | — | Unregulated |
6:2 FTS 6:2 Fluorotelomer sulfonic acid | 51.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 13.90ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 7.70ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 7.20ppt | No federal limit | — | Unregulated |
Show 1 more compound detected at low levels
| PFBSPerfluorobutane sulfonic acid | 5.40 ppt | No federal limit |
Note: ZIP code 77979 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.