CheckPFAS

ZIP 77494 · Louisiana

Katy, LA

High Risk

8 compounds detected

Above EPA drinking water limits

PFOS Exceeds limit
4.20 ppt (105% of MCL)
0 MCL: 4 ppt 6 ppt
PFHxS
3.80 ppt (38% of MCL)
0 MCL: 10 ppt 15 ppt
lithium no federal limit
32300.00 ppt
0 48450 ppt
PFBA no federal limit
20.50 ppt
0 30.8 ppt
PFHxA no federal limit
9.10 ppt
0 13.7 ppt
PFPeA no federal limit
8.80 ppt
0 13.2 ppt
6:2 FTS no federal limit
7.90 ppt
0 11.9 ppt
PFBS no federal limit
4.00 ppt
0 6 ppt
Above EPA limit Below EPA limit No federal limit EPA MCL

Above EPA Limits

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.

PFAS Detected
41
Above EPA Limits
1
Water Systems
17
Highest % of MCL
105%

Plain English

01What 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.

See PFAS-certified filter picks → Read your utility's Consumer Confidence Report →

What to do next

02Three concrete steps

  1. 01

    Install a certified filter

    A reverse osmosis or NSF/ANSI 58-certified carbon block at your kitchen tap is the most reliable solution. Standard pitcher filters (Brita, PUR) don't remove PFAS unless explicitly certified for it. See certified filter picks →

  2. 02

    Read your utility's CCR

    Your water utility publishes an annual Consumer Confidence Report covering the previous year's water quality, including their PFAS treatment plan if any. More detailed than this site's summary. How to read a CCR →

  3. 03

    Reduce other exposure routes

    Water isn't the only input. Replace badly-scratched non-stick pans, skip microwave popcorn bags and greaseproof fast-food wrappers, and choose stainless or cast iron cookware. Full action plan on the FAQ →

Filter Recommendations

Find the right filter for your water
See our tested & reviewed PFAS-certified filters, ranked by CheckPFAS Score

CheckPFAS earns a small commission on filter purchases at no cost to you. Ranked by performance, not commission. Affiliate disclosure.

02UNITED WATER SYSTEM

Low Level

PWSID · LA1099009

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

03FORT BEND COUNTY MUD 34

Moderate

PWSID · TX0790200

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

04HARRIS FORT BEND COUNTIES MUD 1

Low Level

PWSID · TX0790216

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

05CINCO MUD 9

Low Level

PWSID · TX0790307

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

06HARRIS FORT BEND COUNTIES MUD 5

Low Level

PWSID · TX0790347

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

07FORT BEND COUNTY MUD 124

Low Level

PWSID · TX0790412

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

08CINCO MUD 14

Low Level

PWSID · TX0790422

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

09FORT BEND COUNTY MUD 142

High Risk

PWSID · TX0790429

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 pptExceeds 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

010FORT BEND COUNTY MUD 35

Low Level

PWSID · TX0790433

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

011FORT BEND COUNTY MUD 151

Low Level

PWSID · TX0790443

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

012FORT BEND COUNTY MUD 57

Low Level

PWSID · TX0790455

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

013FORT BEND COUNTY MUD 58

Low Level

PWSID · TX0790458

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

014CINCO SOUTHWEST MUD 2

Low Level

PWSID · TX0790481

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

015CINCO SOUTHWEST MUD 3 DAYCARE

Low Level

PWSID · TX0790521

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

016CINCO SOUTHWEST MUD 4

Low Level

PWSID · TX0790522

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

017CITY OF KATY

Low Level

PWSID · TX1010017

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

018HARRIS-FORT BEND COUNTIES MUD 3

Low Level

PWSID · TX1013365

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.

Source & Methodology

About this data

Source
EPA UCMR 5
Data released
January 2026
Sampling period
January 2023 – December 2025
Systems tested
~10,000 public water systems
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

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. "Not detected" means below the MRL, not literally zero.

View raw EPA UCMR 5 occurrence data →

Related

More resources for your area

  1. 01

    How to read your utility's CCR

    Decode your annual Consumer Confidence Report

    →
  2. 02

    On a private well?

    PFAS testing guide for well owners — EPA rules don't apply

    →
  3. 03

    All water systems in Louisiana

    Compare utilities statewide

    →
  4. 04

    Which filter removes PFAS?

    Compare every method by removal rate & NSF certification

    →
  5. 05

    PFAS health effects

    What the science shows, condition by condition

    →
  6. 06

    PFAS compound guide

    Health effects & EPA limits for each compound

    →