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ZIP 78666

Water quality in San Marcos, TX (78666)

Drinking water in ZIP 78666 (San Marcos, Hays County) comes from 52 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: 291,973 people.

Public water systems serving ZIP 78666

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 San Marcos; "Serves your county" means the utility serves Hays 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 SAN MARCOS

    SAN MARCOS · PWSID TX1050001

    Serves 73k people

    Serves your county
  2. CITY OF KYLE

    KYLE · PWSID TX1050002

    Serves 52k people

    Serves your county
  3. TEXAS STATE UNIVERSITY - SAN MARCOS

    SAN MARCOS · PWSID TX1050003

    Serves 44k people

    Serves your county
  4. GOFORTH SUD

    NIEDERWALD · PWSID TX1050019

    Serves 35k people

    Serves your county
  5. CRYSTAL CLEAR SUD

    SAN MARCOS · PWSID TX0940015

    Serves 21k people

    Billing address at this ZIP
  6. COUNTY LINE SUD

    UHLAND · PWSID TX1050038

    Serves 20k people

    Serves your county
  7. CITY OF BUDA

    BUDA · PWSID TX1050012

    Serves 14k people

    Serves your county
  8. DRIPPING SPRINGS WSC

    DRIPPING SPRINGS · PWSID TX1050013

    Serves 8,037 people

    Serves your county
  9. PLUM CREEK

    AUSTIN · PWSID TX1050028

    Serves 7,065 people

    Serves your county
  10. WIMBERLEY WSC

    WIMBERLEY · PWSID TX1050018

    Serves 5,334 people

    Serves your county
  11. HAYS COUNTY WCID 2

    AUSTIN · PWSID TX1050148

    Serves 3,381 people

    Serves your county
  12. WOODCREEK UTILITY CO 2

    AUSTIN · PWSID TX1050039

    Serves 3,096 people

    Serves your county
  13. HAYS COUNTY WCID 1

    AUSTIN · PWSID TX1050137

    Serves 2,850 people

    Serves your county
  14. WOODCREEK UTILITY CO 1

    AUSTIN · PWSID TX1050037

    Serves 2,700 people

    Serves your county
  15. SOUTH BUDA WCID 1

    AUSTIN · PWSID TX1050154

    Serves 2,517 people

    Serves your county
  16. HEADWATERS AT BARTON CREEK

    ROUND ROCK · PWSID TX1050184

    Serves 2,315 people

    Serves your county
  17. CIMARRON PARK WATER

    BUDA · PWSID TX1050059

    Serves 2,079 people

    Serves your county
  18. MID-TEX UTILITIES

    AUSTIN · PWSID TX1050157

    Serves 1,569 people

    Serves your county
  19. MEADOW WOODS WATER SUPPLY

    AUSTIN · PWSID TX1050077

    Serves 1,554 people

    Serves your county
  20. LEISUREWOODS WATER

    AUSTIN · PWSID TX1050043

    Serves 1,338 people

    Serves your county
  21. REUNION RANCH WCID

    AUSTIN · PWSID TX1050175

    Serves 1,326 people

    Serves your county
  22. OAK MEADOWS

    AUSTIN · PWSID TX1050100

    Serves 954 people

    Serves your county
  23. LA VENTANA WATER SUPPLY SYSTEM

    DRIPPING SPRINGS · PWSID TX1050131

    Serves 747 people

    Serves your county
  24. RUBY RANCH WSC

    BUDA · PWSID TX1050122

    Serves 738 people

    Serves your county
  25. CITY OF MOUNTAIN CITY

    MOUNTAIN CITY · PWSID TX1050062

    Serves 725 people

    Serves your county
  26. ELLIOTT RANCH WATER SYSTEM

    HAYS · PWSID TX1050132

    Serves 639 people

    Serves your county
  27. CITY OF DRIPPING SPRINGS

    DRIPPING SPRINGS · PWSID TX1050187

    Serves 531 people

    Serves your county
  28. CEDAR OAK MESA WSC

    WIMBERLEY · PWSID TX1050031

    Serves 497 people

    Serves your county
  29. SIERRA WEST SUBDIVISION

    AUSTIN · PWSID TX1050134

    Serves 495 people

    Serves your county
  30. GOLDENWOOD WEST WSC

    DRIPPING SPRINGS · PWSID TX1050081

    Serves 462 people

    Serves your county
  31. CHAPARRAL WATER SYSTEM HAYS

    AUSTIN · PWSID TX1050029

    Serves 444 people

    Serves your county
  32. HUNTINGTON ESTATES

    AUSTIN · PWSID TX1050124

    Serves 378 people

    Serves your county
  33. OAK FOREST WSC

    BUDA · PWSID TX1050128

    Serves 339 people

    Serves your county
  34. RIVER OAKS RANCH

    AUSTIN · PWSID TX1050099

    Serves 336 people

    Serves your county
  35. SOUTHWEST TERRITORY

    AUSTIN · PWSID TX1050058

    Serves 315 people

    Serves your county
  36. MOUNTAIN CREST WATER

    AUSTIN · PWSID TX1050111

    Serves 309 people

    Serves your county
  37. DRIFTWOOD GOLF AND RANCH CLUB

    DRIPPING SPRINGS · PWSID TX1050208

    Serves 294 people

    Serves your county
  38. CITY OF HAYS

    BUDA · PWSID TX1050004

    Serves 270 people

    Serves your county
  39. SKYLINE RANCH ESTATES WSC

    WIMBERLEY · PWSID TX1050078

    Serves 261 people

    Serves your county
  40. GRANITE CREEK WSC

    AUSTIN · PWSID TX1050080

    Serves 219 people

    Serves your county
  41. CARDINAL VALLEY WATER

    AUSTIN · PWSID TX1050068

    Serves 216 people

    Serves your county
  42. COPPER HILLS WATER SYSTEM

    AUSTIN · PWSID TX1050082

    Serves 141 people

    Serves your county
  43. LSR WSC

    WIMBERLEY · PWSID TX1050135

    Serves 126 people

    Serves your county
  44. RADIANCE WSC

    AUSTIN · PWSID TX1050075

    Serves 120 people

    Serves your county
  45. GATEWAY DEVELOPMENT

    HOUSTON · PWSID TX1050121

    Serves 108 people

    Serves your county
  46. WIMBERLEY OAKS WSC

    WIMBERLEY · PWSID TX1050120

    Serves 69 people

    Serves your county
  47. JP AND LP RENTALS

    AUSTIN · PWSID TX1050180

    Serves 60 people

    Serves your county
  48. BLUE AGAVE MOBILE HOME PARK

    MARTINDALE · PWSID TX1050105

    Serves 57 people

    Serves your county
  49. SIGNAL HILL WATER SYSTEM 24

    AUSTIN · PWSID TX1050035

    Serves 42 people

    Serves your county
  50. GATEWAY ESTATES III

    AUSTIN · PWSID TX1050116

    Serves 36 people

    Serves your county
  51. PROCHNOW COUNTRY HOMES

    AUSTIN · PWSID TX1050191

    Serves 30 people

    Serves your county
  52. ALLIANCE REGIONAL WATER AUTHORITY 1B

    SAN MARCOS · PWSID TX0280027

    Serves 0 people

    Billing address at this ZIP

More for TX

How we matched ZIP 78666: 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.