ZIP Code 77059
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.
19
PFAS Detected
1
Above EPA Limits
3
Water Systems
168%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 168% of limit
Detected: 6.70 ppt
CITY OF HOUSTON, TX
TX1010013 ModerateWater Type
Groundwater
PFAS Detected
5
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 33900.00ppt | No federal limit | — | Unregulated |
6:2 FTS 6:2 Fluorotelomer sulfonic acid | 42.60ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 10.60ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 6.70ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 5.10ppt | No federal limit | — | Unregulated |
CLEAR LAKE CITY WATER AUTHORITY
TX1010056 High RiskWater Type
Surface Water
PFAS Detected
9
Above MCL
1
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 6.70ppt | 168% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 4.00ppt | 100% of limit
| 4 ppt | Below limit |
PFHxS Perfluorohexane sulfonic acid | 6.00ppt | 60% of limit
| 10 ppt | Below limit |
lithium | 12900.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 14.50ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 9.50ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 8.80ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 5.70ppt | No federal limit | — | Unregulated |
Show 1 more compound detected at low levels
| PFHpAPerfluoroheptanoic acid | 3.70 ppt | No federal limit |
HARRIS COUNTY WCID 161
TX1013612 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 | 3.70ppt | 37% of limit
| 10 ppt | Below limit |
PFBA Perfluorobutanoic acid | 36.60ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 7.50ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 6.90ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 3.70ppt | No federal limit | — | Unregulated |
Note: ZIP code 77059 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.