CheckPFAS

ZIP 77449 · Texas

Katy, TX

Moderate
See the full Katy overview — all utilities & ZIP codes →

6 compounds detected

Detected — below EPA limits

PFHxS
3.70 ppt (37% of MCL)
0 MCL: 10 ppt 15 ppt
lithium no federal limit
50200.00 ppt
0 75300 ppt
PFHxA no federal limit
9.90 ppt
0 14.9 ppt
PFBA no federal limit
9.10 ppt
0 13.7 ppt
PFPeA no federal limit
8.20 ppt
0 12.3 ppt
PFBS no federal limit
4.30 ppt
0 6.5 ppt
Above EPA limit Below EPA limit No federal limit EPA MCL
PFAS Detected
43
Above EPA Limits
0
Water Systems
19
Highest % of MCL
37%

Plain English

01What this means for you

PFAS were detected at this water system, but below the EPA's Maximum Contaminant Level. "Below the limit" doesn't mean no risk — it means EPA considers the concentration acceptable across a lifetime of consumption at that level. Some people, particularly pregnant women, infants, and those with compromised immune systems, may wish to take additional precaution. Using a filter certified NSF/ANSI 58 for PFOA/PFOS reduction is a reasonable step that costs little and eliminates this variable entirely. Continue reading your utility's annual Consumer Confidence Report for year-to-year trends.

NSF-certified filter options → How to read your CCR →

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.

02WESTON MUD

Low Level

PWSID · TX1010634

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

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
26800.00pptNo federal limit—Unregulated

03HARRIS COUNTY MUD 61

Low Level

PWSID · TX1010721

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

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
15100.00pptNo federal limit—Unregulated

04WEST HARRIS COUNTY MUD 2 CHASE

Low Level

PWSID · TX1011029

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

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
38400.00pptNo federal limit—Unregulated

05HARRIS COUNTY MUD 105

Low Level

PWSID · TX1011227

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

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
45500.00pptNo federal limit—Unregulated
PFBA
Perfluorobutanoic acid
5.80pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
4.10pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
3.80pptNo federal limit—Unregulated

06LANGHAM CREEK UTILITY DISTRICT

Moderate

PWSID · TX1011249

Water Type
MX
PFAS Detected
6
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFHxS
Perfluorohexane sulfonic acid
3.30ppt
33% of limit
10 pptBelow limit
lithium
33100.00pptNo federal limit—Unregulated
PFBA
Perfluorobutanoic acid
9.10pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
7.40pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
6.30pptNo federal limit—Unregulated
PFBS
Perfluorobutane sulfonic acid
3.70pptNo federal limit—Unregulated

07HARRIS COUNTY MUD 157

Moderate

PWSID · TX1011430

Water Type
Groundwater
PFAS Detected
5
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFHxS
Perfluorohexane sulfonic acid
3.70ppt
37% of limit
10 pptBelow limit
lithium
20800.00pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
9.90pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
8.20pptNo federal limit—Unregulated
PFBS
Perfluorobutane sulfonic acid
4.30pptNo federal limit—Unregulated

08FRY ROAD MUD

Low Level

PWSID · TX1011679

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

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
38000.00pptNo federal limit—Unregulated

09CLAY ROAD MUD

Low Level

PWSID · TX1011681

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

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
11100.00pptNo federal limit—Unregulated
PFBA
Perfluorobutanoic acid
7.70pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
4.60pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
4.30pptNo federal limit—Unregulated

010MAYDE CREEK MUD

Low Level

PWSID · TX1011689

Water Type
Groundwater
PFAS Detected
3
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFBA
Perfluorobutanoic acid
5.10pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
4.60pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
4.00pptNo federal limit—Unregulated

011WESTERN PINES MHP

Low Level

PWSID · TX1011714

Water Type
Groundwater
PFAS Detected
2
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
10200.00pptNo federal limit—Unregulated
PFBA
Perfluorobutanoic acid
5.60pptNo federal limit—Unregulated

012HARRIS COUNTY MUD 71

Low Level

PWSID · TX1011823

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

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
50200.00pptNo federal limit—Unregulated

013NORTHWEST HARRIS COUNTY MUD 12

Low Level

PWSID · TX1011901

Water Type
Groundwater
PFAS Detected
3
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
16000.00pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
5.00pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
3.60pptNo federal limit—Unregulated

014HARRIS COUNTY MUD 165

Low Level

PWSID · TX1012187

Water Type
Groundwater
PFAS Detected
3
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
28400.00pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
4.70pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
4.10pptNo federal limit—Unregulated

015RICEWOOD MUD

Low Level

PWSID · TX1012227

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

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
12200.00pptNo federal limit—Unregulated

016WEST HARRIS COUNTY MUD 7

Low Level

PWSID · TX1012228

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

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
11700.00pptNo federal limit—Unregulated

017HARRIS COUNTY MUD 127

Low Level

PWSID · TX1012229

Water Type
Surface Water
PFAS Detected
3
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
9250.00pptNo federal limit—Unregulated
PFBA
Perfluorobutanoic acid
5.90pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
3.30pptNo federal limit—Unregulated

018HARRIS COUNTY MUD 239

Low Level

PWSID · TX1012392

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

019HARRIS COUNTY MUD 167

Low Level

PWSID · TX1012842

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

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
24500.00pptNo federal limit—Unregulated

020HARRIS COUNTY MUD 287

Low Level

PWSID · TX1013385

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

PFAS test results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
43000.00pptNo federal limit—Unregulated

Note: ZIP code 77449 is served by 19 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)
TX1010634 · TX1010721 · TX1011029 · TX1011227 · TX1011249 · TX1011430 · TX1011679 · TX1011681 · TX1011689 · TX1011714 · TX1011823 · TX1011901 · TX1012187 · TX1012227 · TX1012228 · TX1012229 · TX1012392 · TX1012842 · TX1013385
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 Texas

    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

    →