ZIP Code 79510
High RiskPFAS above EPA limits detected
9 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.
28
PFAS Detected
9
Above EPA Limits
3
Water Systems
525%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 375% of limit
Detected: 15.00 ppt
PFHxS Exceeds EPA limit
0 ppt MCL: 10 ppt 225% of limit
Detected: 22.50 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 143% of limit
Detected: 5.70 ppt
CITY OF CLYDE
TX0300002 High RiskWater Type
Surface Water
PFAS Detected
10
Above MCL
3
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 15.00ppt | 375% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 22.50ppt | 225% of limit
| 10 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 5.70ppt | 143% of limit
| 4 ppt | ⚠ Exceeds MCL |
lithium | 15100.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 16.40ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 14.80ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 14.50ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 7.60ppt | No federal limit | — | Unregulated |
Show 2 more compounds detected at low levels
| PFBSPerfluorobutane sulfonic acid | 6.20 ppt | No federal limit |
| 6:2 FTS6:2 Fluorotelomer sulfonic acid | 6.20 ppt | No federal limit |
EULA WSC
TX0300005 High RiskWater Type
Surface Water
PFAS Detected
9
Above MCL
3
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 20.00ppt | 500% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 21.30ppt | 213% of limit
| 10 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 6.20ppt | 155% of limit
| 4 ppt | ⚠ Exceeds MCL |
lithium | 11900.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 31.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 16.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 13.00ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 7.50ppt | No federal limit | — | Unregulated |
Show 1 more compound detected at low levels
| PFBSPerfluorobutane sulfonic acid | 5.90 ppt | No federal limit |
POTOSI WSC
TX2210008 High RiskWater Type
Surface Water
PFAS Detected
9
Above MCL
3
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 21.00ppt | 525% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 19.90ppt | 199% of limit
| 10 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 6.70ppt | 168% of limit
| 4 ppt | ⚠ Exceeds MCL |
lithium | 15100.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 22.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 15.70ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 13.60ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 8.70ppt | No federal limit | — | Unregulated |
Show 1 more compound detected at low levels
| PFBSPerfluorobutane sulfonic acid | 6.10 ppt | No federal limit |
Note: ZIP code 79510 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.