CheckPFAS

City overview · Harris County

PFAS in Katy, TX

High Risk

EPA UCMR 5 tested 34 public water systems serving the Katy area across 3 ZIP codes. At least one utility serving Katy has PFAS above the EPA's enforceable limit.

Water systems tested
34
Systems above EPA limits
1
ZIP codes covered
3
County
Harris County, Texas

Plain English

01What this means for Katy

Across the 34 public water systems tested in the Katy area under EPA UCMR 5, one or more measured a PFAS compound above the federal Maximum Contaminant Level. Contamination varies by utility and neighborhood — find your exact ZIP code below to see the system that serves you. If you're in an affected area, an NSF/ANSI 53 or 58 certified filter (carbon block or reverse osmosis) is the most reliable way to reduce PFAS at the tap.

By utility

02Water systems serving Katy

  1. FORT BEND COUNTY MUD 142

    8 detected · 1 above limit · PWSID TX0790429

    High Risk

  2. LANGHAM CREEK UTILITY DISTRICT

    6 detected · 0 above limit · PWSID TX1011249

    Moderate

  3. INTERSTATE MUD

    6 detected · 0 above limit · PWSID TX1012264

    Moderate

  4. HARRIS COUNTY MUD 157

    5 detected · 0 above limit · PWSID TX1011430

    Moderate

  5. HARRIS COUNTY MUD 105

    4 detected · 0 above limit · PWSID TX1011227

    Low Level

  6. CLAY ROAD MUD

    4 detected · 0 above limit · PWSID TX1011681

    Low Level

  7. MAYDE CREEK MUD

    3 detected · 0 above limit · PWSID TX1011689

    Low Level

  8. NORTHWEST HARRIS COUNTY MUD 12

    3 detected · 0 above limit · PWSID TX1011901

    Low Level

  9. HARRIS COUNTY MUD 165

    3 detected · 0 above limit · PWSID TX1012187

    Low Level

  10. HARRIS COUNTY MUD 127

    3 detected · 0 above limit · PWSID TX1012229

    Low Level

  11. WESTERN PINES MHP

    2 detected · 0 above limit · PWSID TX1011714

    Low Level

  12. WESTON MUD

    1 detected · 0 above limit · PWSID TX1010634

    Low Level

  13. HARRIS COUNTY MUD 61

    1 detected · 0 above limit · PWSID TX1010721

    Low Level

  14. WEST HARRIS COUNTY MUD 2 CHASE

    1 detected · 0 above limit · PWSID TX1011029

    Low Level

  15. FRY ROAD MUD

    1 detected · 0 above limit · PWSID TX1011679

    Low Level

  16. HARRIS COUNTY MUD 71

    1 detected · 0 above limit · PWSID TX1011823

    Low Level

  17. RICEWOOD MUD

    1 detected · 0 above limit · PWSID TX1012227

    Low Level

  18. WEST HARRIS COUNTY MUD 7

    1 detected · 0 above limit · PWSID TX1012228

    Low Level

  19. HARRIS COUNTY MUD 239

    1 detected · 0 above limit · PWSID TX1012392

    Low Level

  20. HARRIS COUNTY MUD 167

    1 detected · 0 above limit · PWSID TX1012842

    Low Level

  21. HARRIS COUNTY MUD 287

    1 detected · 0 above limit · PWSID TX1013385

    Low Level

  22. CINCO MUD 2

    1 detected · 0 above limit · PWSID TX0790306

    Low Level

  23. CINCO MUD 8

    1 detected · 0 above limit · PWSID TX0790324

    Low Level

  24. CINCO MUD 7

    1 detected · 0 above limit · PWSID TX0790343

    Low Level

  25. MASON CREEK UTILITY DISTRICT

    1 detected · 0 above limit · PWSID TX1010379

    Low Level

  26. WEST MEMORIAL MUD

    1 detected · 0 above limit · PWSID TX1010540

    Low Level

  27. HARRIS COUNTY MUD 81

    1 detected · 0 above limit · PWSID TX1010581

    Low Level

  28. MEMORIAL MUD

    1 detected · 0 above limit · PWSID TX1011242

    Low Level

  29. CIMARRON MUD

    1 detected · 0 above limit · PWSID TX1011410

    Low Level

  30. CORNERSTONES MUD

    1 detected · 0 above limit · PWSID TX1011692

    Low Level

  31. NOTTINGHAM COUNTRY MUD

    1 detected · 0 above limit · PWSID TX1012315

    Low Level

  32. CITY OF KATY

    1 detected · 0 above limit · PWSID TX1010017

    Low Level

  33. HARRIS COUNTY MUD 65

    1 detected · 0 above limit · PWSID TX1011678

    Low Level

  34. HARRIS COUNTY MUD 495

    1 detected · 0 above limit · PWSID TX1013532

    Low Level

By ZIP code

03Find your exact result

Contamination can differ block to block. Select your ZIP code for the precise reading at the utility that serves your address.

774497745077493

Source & Methodology

About this data

Source
EPA UCMR 5
Sampling period
January 2023 – December 2025
Aggregation
34 utilities across 3 ZIP codes
Detection threshold (MRL)
~1.5–2 ppt

City-level figures aggregate the individual public water systems tested under EPA UCMR 5 whose service area falls within the Katy area. Values reflect water quality at the treatment plant; your home's plumbing can affect what reaches your tap. Select your ZIP above for the utility-specific reading.