ZIP Code 78133
High RiskPFAS above EPA limits detected
2 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.
7
PFAS Detected
2
Above EPA Limits
3
Water Systems
130%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 130% of limit
Detected: 5.20 ppt
PFHxS Exceeds EPA limit
0 ppt MCL: 10 ppt 125% of limit
Detected: 12.50 ppt
CLWSC CANYON LAKE SHORES
TX0460019 Low LevelWater Type
Surface Water
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFBA Perfluorobutanoic acid | 7.10ppt | No federal limit | — | Unregulated |
CANYON SPRINGS WATER
TX0460022 Low LevelWater Type
Groundwater
PFAS Detected
3
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFHxS Perfluorohexane sulfonic acid | 3.90ppt | 39% of limit
| 10 ppt | Below limit |
PFBS Perfluorobutane sulfonic acid | 12.20ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 3.60ppt | No federal limit | — | Unregulated |
SJWTX TRIPLE PEAK PLANT
TX0460172 High RiskWater Type
Groundwater
PFAS Detected
3
Above MCL
2
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 5.20ppt | 130% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 12.50ppt | 125% of limit
| 10 ppt | ⚠ Exceeds MCL |
PFBS Perfluorobutane sulfonic acid | 6.40ppt | No federal limit | — | Unregulated |
Note: ZIP code 78133 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.