CheckPFAS

ZIP Code 77494

High Risk
High Risk PFAS Risk Level

PFAS 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
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UNITED WATER SYSTEM

LA1099009 Low Level
Water Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Louisiana
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
11200.00pptNo federal limit—Unregulated

FORT BEND COUNTY MUD 34

TX0790200 Moderate
Water Type
Surface Water
PFAS Detected
5
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
10500.00pptNo federal limit—Unregulated
PFBA
Perfluorobutanoic acid
6.50pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
4.90pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
4.40pptNo federal limit—Unregulated
PFBS
Perfluorobutane sulfonic acid
3.30pptNo federal limit—Unregulated

HARRIS FORT BEND COUNTIES MUD 1

TX0790216 Low Level
Water Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
30100.00pptNo federal limit—Unregulated

CINCO MUD 9

TX0790307 Low Level
Water Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
23600.00pptNo federal limit—Unregulated

HARRIS FORT BEND COUNTIES MUD 5

TX0790347 Low Level
Water Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
29600.00pptNo federal limit—Unregulated

FORT BEND COUNTY MUD 124

TX0790412 Low Level
Water Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
16000.00pptNo federal limit—Unregulated

CINCO MUD 14

TX0790422 Low Level
Water Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
21100.00pptNo federal limit—Unregulated

FORT BEND COUNTY MUD 142

TX0790429 High Risk
Water Type
Surface Water
PFAS Detected
8
Above MCL
1
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFOS
Perfluorooctane sulfonic acid
4.20ppt
105% of limit
4 ppt⚠ Exceeds MCL
PFHxS
Perfluorohexane sulfonic acid
3.80ppt
38% of limit
10 pptBelow limit
lithium
12200.00pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
9.10pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
8.80pptNo federal limit—Unregulated
6:2 FTS
6:2 Fluorotelomer sulfonic acid
7.90pptNo federal limit—Unregulated
PFBA
Perfluorobutanoic acid
7.60pptNo federal limit—Unregulated
PFBS
Perfluorobutane sulfonic acid
4.00pptNo federal limit—Unregulated

FORT BEND COUNTY MUD 35

TX0790433 Low Level
Water Type
Groundwater
PFAS Detected
4
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
14100.00pptNo federal limit—Unregulated
PFBA
Perfluorobutanoic acid
6.30pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
4.20pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
3.70pptNo federal limit—Unregulated

FORT BEND COUNTY MUD 151

TX0790443 Low Level
Water Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
30300.00pptNo federal limit—Unregulated

FORT BEND COUNTY MUD 57

TX0790455 Low Level
Water Type
Surface Water
PFAS Detected
4
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
20400.00pptNo federal limit—Unregulated
PFBA
Perfluorobutanoic acid
20.50pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
5.30pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
4.90pptNo federal limit—Unregulated

FORT BEND COUNTY MUD 58

TX0790458 Low Level
Water Type
MX
PFAS Detected
4
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
32300.00pptNo federal limit—Unregulated
PFBA
Perfluorobutanoic acid
5.20pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
3.50pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
3.40pptNo federal limit—Unregulated

CINCO SOUTHWEST MUD 2

TX0790481 Low Level
Water Type
Surface Water
PFAS Detected
4
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
18200.00pptNo federal limit—Unregulated
PFBA
Perfluorobutanoic acid
5.70pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
5.20pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
4.70pptNo federal limit—Unregulated

CINCO SOUTHWEST MUD 3 DAYCARE

TX0790521 Low Level
Water Type
Surface Water
PFAS Detected
2
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
20000.00pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
3.40pptNo federal limit—Unregulated

CINCO SOUTHWEST MUD 4

TX0790522 Low Level
Water Type
MX
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
23700.00pptNo federal limit—Unregulated

CITY OF KATY

TX1010017 Low Level
Water Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
24300.00pptNo federal limit—Unregulated

HARRIS-FORT BEND COUNTIES MUD 3

TX1013365 Low Level
Water Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
12900.00pptNo federal limit—Unregulated
Note: ZIP code 77494 is served by 17 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.

View raw EPA data →