ZIP Code 77494
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.
41
PFAS Detected
1
Above EPA Limits
17
Water Systems
105%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 105% of limit
Detected: 4.20 ppt
What this means for you
One or more PFAS compounds were measured above the EPA's enforceable drinking water limit at a utility serving ZIP 77494. The EPA set these limits because long-term exposure at higher concentrations is associated with health effects including immune suppression, thyroid changes, and cancer risk increases. Standard pitcher filters (Brita, PUR) are not certified to remove PFAS. The most reliable at-home options are under-sink reverse osmosis systems or activated carbon block filters with an NSF/ANSI 58 certification specifically listing PFOA/PFOS reduction. Your water utility is required to bring levels into compliance by 2029 — filtering at the tap is the practical interim step if you'd like additional protection now.
UNITED WATER SYSTEM
LA1099009 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Louisiana
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 11200.00ppt | No federal limit | — | Unregulated |
FORT BEND COUNTY MUD 34
TX0790200 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 |
|---|---|---|---|---|
lithium | 10500.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 6.50ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 4.90ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.40ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 3.30ppt | No federal limit | — | Unregulated |
HARRIS FORT BEND COUNTIES MUD 1
TX0790216 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 30100.00ppt | No federal limit | — | Unregulated |
CINCO MUD 9
TX0790307 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 23600.00ppt | No federal limit | — | Unregulated |
HARRIS FORT BEND COUNTIES MUD 5
TX0790347 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 29600.00ppt | No federal limit | — | Unregulated |
FORT BEND COUNTY MUD 124
TX0790412 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 16000.00ppt | No federal limit | — | Unregulated |
CINCO MUD 14
TX0790422 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 21100.00ppt | No federal limit | — | Unregulated |
FORT BEND COUNTY MUD 142
TX0790429 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 | 4.20ppt | 105% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 3.80ppt | 38% of limit
| 10 ppt | Below limit |
lithium | 12200.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 9.10ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 8.80ppt | No federal limit | — | Unregulated |
6:2 FTS 6:2 Fluorotelomer sulfonic acid | 7.90ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 7.60ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 4.00ppt | No federal limit | — | Unregulated |
FORT BEND COUNTY MUD 35
TX0790433 Low LevelWater Type
Groundwater
PFAS Detected
4
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 14100.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 6.30ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.20ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 3.70ppt | No federal limit | — | Unregulated |
FORT BEND COUNTY MUD 151
TX0790443 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 30300.00ppt | No federal limit | — | Unregulated |
FORT BEND COUNTY MUD 57
TX0790455 Low LevelWater Type
Surface Water
PFAS Detected
4
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 20400.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 20.50ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 5.30ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.90ppt | No federal limit | — | Unregulated |
FORT BEND COUNTY MUD 58
TX0790458 Low LevelWater Type
MX
PFAS Detected
4
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 32300.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 5.20ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 3.50ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 3.40ppt | No federal limit | — | Unregulated |
CINCO SOUTHWEST MUD 2
TX0790481 Low LevelWater Type
Surface Water
PFAS Detected
4
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 18200.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 5.70ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 5.20ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.70ppt | No federal limit | — | Unregulated |
CINCO SOUTHWEST MUD 3 DAYCARE
TX0790521 Low LevelWater Type
Surface Water
PFAS Detected
2
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 20000.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 3.40ppt | No federal limit | — | Unregulated |
CINCO SOUTHWEST MUD 4
TX0790522 Low LevelWater Type
MX
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 23700.00ppt | No federal limit | — | Unregulated |
CITY OF KATY
TX1010017 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 24300.00ppt | No federal limit | — | Unregulated |
HARRIS-FORT BEND COUNTIES MUD 3
TX1013365 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 12900.00ppt | No federal limit | — | Unregulated |
Note: ZIP code 77494 is served by 17 separate water utilities.
Results above show data for each system independently.
About this data
Source
EPA UCMR 5 (Unregulated Contaminant Monitoring Rule, 5th cycle)
Data released
January 2026
Sampling period
January 2023 – December 2025
Systems tested
~10,000 public water systems serving > 25 people
Water systems (PWSID)
LA1099009, TX0790200, TX0790216, TX0790307, TX0790347, TX0790412, TX0790422, TX0790429, TX0790433, TX0790443, TX0790455, TX0790458, TX0790481, TX0790521, TX0790522, TX1010017, TX1013365
Detection threshold (MRL)
~1.5–2 ppt — "Not detected" means below this floor, not zero
Values shown are the highest single-sample concentration measured at entry points to the distribution system. Results reflect water quality at the treatment plant — aging pipes, building plumbing, and on-site storage can affect what actually reaches your tap.