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ZIP 78665

Water quality in Round Rock, TX (78665)

Drinking water in ZIP 78665 (Round Rock, Williamson County) comes from 42 public water system s on EPA's records. The list below is ranked by population served: the largest regional authority for your area appears first, smaller subdivisions and private systems below.

Combined population served: 700,983 people.

Public water systems serving ZIP 78665

Ranked by population served. Tier badges show how EPA records each utility's service area: "Serves your city" means EPA's geographic-areas table specifically lists Round Rock; "Serves your county" means the utility serves Williamson County (regional authorities are usually filed this way); "Billing address at this ZIP" means the utility files paperwork from this ZIP but EPA does not confirm it serves you.

  1. CITY OF GEORGETOWN

    GEORGETOWN · PWSID TX2460001

    Serves 192k people

    Serves your county
  2. CITY OF ROUND ROCK

    ROUND ROCK · PWSID TX2460003

    Serves 131k people

    Serves your county
  3. CITY OF LEANDER

    LEANDER · PWSID TX2460012

    Serves 98k people

    Serves your county
  4. CITY OF CEDAR PARK

    CEDAR PARK · PWSID TX2460009

    Serves 87k people

    Serves your county
  5. JONAH WATER SUD

    HUTTO · PWSID TX2460022

    Serves 30k people

    Serves your county
  6. CITY OF HUTTO

    HUTTO · PWSID TX2460007

    Serves 30k people

    Serves your county
  7. CITY OF TAYLOR

    TAYLOR · PWSID TX2460004

    Serves 21k people

    Serves your county
  8. BRUSHY CREEK MUD

    ROUND ROCK · PWSID TX2460061

    Serves 18k people

    Serves your county
  9. SONTERRA MUD

    AUSTIN · PWSID TX2460157

    Serves 17k people

    Serves your county
  10. JARRELL SCHWERTNER WSC

    JARRELL · PWSID TX2460011

    Serves 9,681 people

    Serves your county
  11. CITY OF LIBERTY HILL

    LIBERTY HILL · PWSID TX2460013

    Serves 8,777 people

    Serves your county
  12. WILLIAMSON COUNTY WSID 3

    AUSTIN · PWSID TX2460152

    Serves 8,265 people

    Serves your county
  13. BLOCK HOUSE MUD

    LEANDER · PWSID TX2460110

    Serves 6,618 people

    Serves your county
  14. WILLIAMSON TRAVIS COUNTY MUD 1

    CEDAR PARK · PWSID TX2460120

    Serves 5,793 people

    Serves your county
  15. FERN BLUFF MUD

    ROUND ROCK · PWSID TX2460128

    Serves 5,682 people

    Serves your county
  16. WILLIAMSON COUNTY MUD 11

    AUSTIN · PWSID TX2460159

    Serves 4,248 people

    Serves your county
  17. WILLIAMSON COUNTY MUD 10

    AUSTIN · PWSID TX2460145

    Serves 3,513 people

    Serves your county
  18. CITY OF JARRELL

    JARRELL · PWSID TX2460169

    Serves 3,450 people

    Serves your county
  19. PALOMA LAKE MUD 1

    AUSTIN · PWSID TX2460164

    Serves 3,111 people

    Serves your county
  20. CITY OF BARTLETT

    BARTLETT · PWSID TX2460006

    Serves 2,950 people

    Serves your county
  21. VISTA OAKS MUD

    AUSTIN · PWSID TX2460139

    Serves 2,724 people

    Serves your county
  22. HEADWATERS AT BARTON CREEK

    ROUND ROCK · PWSID TX1050184

    Serves 2,315 people

    Billing address at this ZIP
  23. PALOMA LAKE MUD 2

    AUSTIN · PWSID TX2460165

    Serves 2,265 people

    Serves your county
  24. CITY OF GRANGER

    GRANGER · PWSID TX2460002

    Serves 1,914 people

    Serves your county
  25. BLESSING MOBILE HOME PARK

    ROUND ROCK · PWSID TX2460031

    Serves 1,518 people

    Serves your county
  26. TRAVIS COUNTY MUD 18

    ROUND ROCK · PWSID TX2270403

    Serves 1,491 people

    Billing address at this ZIP
  27. DURHAM PARK WSC

    LIBERTY HILL · PWSID TX2460038

    Serves 1,251 people

    Serves your county
  28. CITY OF FLORENCE

    FLORENCE · PWSID TX2460005

    Serves 1,136 people

    Serves your county
  29. CITY OF THRALL

    THRALL · PWSID TX2460015

    Serves 975 people

    Serves your county
  30. TAL TEX

    AUSTIN · PWSID TX2460064

    Serves 939 people

    Serves your county
  31. SAN GABRIEL RIVER RANCHES

    AUSTIN · PWSID TX2460046

    Serves 891 people

    Serves your county
  32. WALSH RANCH MUD

    ROUND ROCK · PWSID TX2460160

    Serves 714 people

    Serves your county
  33. BRUSHY BEND PARK

    AUSTIN · PWSID TX2460050

    Serves 645 people

    Serves your county
  34. BARTON CREEK WSC

    ROUND ROCK · PWSID TX2270313

    Serves 633 people

    Billing address at this ZIP
  35. SOUTH SAN GABRIEL RANCHES

    AUSTIN · PWSID TX2460026

    Serves 510 people

    Serves your county
  36. HIGH GABRIEL WSC

    CEDAR PARK · PWSID TX2460027

    Serves 492 people

    Serves your county
  37. ROUND ROCK RANCH PUD UTILITY COMPANY

    HUTTO · PWSID TX2460161

    Serves 285 people

    Serves your county
  38. LIBERTY GREENLINE

    LIBERTY HILL · PWSID TX2460162

    Serves 46 people

    Serves your county
  39. COUNTY COTTAGE LINES

    BERTRAM · PWSID TX2460178

    Serves 29 people

    Serves your county
  40. BRAZOS RIVER AUTHORITY GRANGER LAKE REGI

    WACO · PWSID TX2460155

    Serves 0 people

    Serves your county
  41. BRUSHY CREEK REGIONAL UTILITY AUTHORITY

    ROUND ROCK · PWSID TX2460166

    Serves 0 people

    Serves your county
  42. LONE STAR RWA

    PFLUGERVILLE · PWSID TX2460172

    Serves 0 people

    Serves your county

More for TX

How we matched ZIP 78665: we translate the ZIP to a city and county via the Geonames postal database, then match against service-area cities and counties EPA has on file for each public water system. EPA does not publish authoritative service-area boundary maps for most systems, so there is still some guesswork; large regional authorities (e.g., county-wide water and sewer authorities) are usually filed at the county level even when they serve specific cities. Your water bill names the authoritative utility. Methodology.