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Hays County, Texas — public water systems

At a glance

118 active public water systems are filed under Hays County, Texas in EPA's SDWIS records, together reporting 306,428 people served. The largest is City of San Marcos, which reports serving 72,970 people. 52 are community water systems serving people where they live; the other 66 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.

Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

118

Population served

306.4K

Community systems

52

Groundwater share

64.4%

How does Hays County compare with other Texas counties?

Hays County has the 6th-most active public water systems among the 309 counties listed for active Texas systems in EPA records; among the 234 with 3 or more systems, the median has 12. Its systems report 306,428 people served in total, the 19th-largest county figure in the state and 0.9% of the statewide total. The average system here reports serving 2,597 people, about half of the Texas average of 4,789. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.

Where does Hays County's drinking water come from?

By primary water source, Hays County's active systems draw on groundwater (72, 61%), purchased surface water (40, 34%), groundwater under influence of surface water (3, 2.5%) and surface water (1, 0.8%). Overall, 64% rely mainly on groundwater (including purchased groundwater) and 35% on surface water, compared with 78% and 21% across Texas. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, City of San Marcos, draws primarily on surface water.

What kinds of water systems operate in Hays County?

Hays County's active systems break down as 52 community systems (44%), 12 non-transient non-community systems (10%) and 54 transient non-community systems (46%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as private (74%), local government (25%) and state government (1.7%).

The 50 largest water systems in Hays County

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Active public water systems in Hays County, Texas
#Water systemCountyPopulation servedTypeSource
1City of San MarcosHays72,970CommunitySurface water
2City of KyleHays52,000CommunityPurchased surface water
3Texas State University - San MarcosHays43,552CommunityGroundwater
4Goforth SudHays34,893CommunityPurchased surface water
5County Line SudHays19,609CommunityPurchased surface water
6City of BudaHays13,830CommunityPurchased surface water
7Dripping Springs WSCHays8,037CommunityPurchased surface water
8Plum CreekHays7,065CommunityPurchased surface water
9Wimberley WSCHays5,334CommunityGroundwater
10Hays Cisd Jack C Hays High SchoolHays4,048Non-transient non-communityGroundwater
11Hays County Wcid 2Hays3,381CommunityPurchased surface water
12Woodcreek Utility Co 2Hays3,096CommunityGroundwater under influence of surface water
13Hays County Wcid 1Hays2,850CommunityPurchased surface water
14Woodcreek Utility Co 1Hays2,700CommunityGroundwater
15South Buda Wcid 1Hays2,517CommunityPurchased surface water
16Headwaters at Barton CreekHays2,315CommunityPurchased surface water
17Cimarron Park WaterHays2,079CommunityGroundwater
18Mid-Tex UtilitiesHays1,569CommunityPurchased surface water
19Meadow Woods Water SupplyHays1,554CommunityGroundwater
20Leisurewoods WaterHays1,338CommunityGroundwater
21Reunion Ranch WcidHays1,326CommunityPurchased surface water
22Salt Lick Bar B QHays1,143Transient non-communityPurchased surface water
23Oak MeadowsHays954CommunityGroundwater
24La Ventana Water Supply SystemHays747CommunityGroundwater
25Ruby Ranch WSCHays738CommunityGroundwater
26City of Mountain CityHays725CommunityGroundwater
27Elliott Ranch Water SystemHays639CommunityGroundwater
28Promiseland Church San MarcosHays625Non-transient non-communityGroundwater
29City of Dripping SpringsHays531CommunityPurchased surface water
30Cedar Oak Mesa WSCHays497CommunityGroundwater
31Sierra West SubdivisionHays495CommunityGroundwater
32Goldenwood West WSCHays462CommunityGroundwater under influence of surface water
33San Marcos Baptist AcademyHays450Non-transient non-communityGroundwater
34Chaparral Water System HaysHays444CommunityGroundwater
35Hays Youth Sports ComplexHays400Transient non-communityGroundwater
36Huntington EstatesHays378CommunityGroundwater
37Trattoria LisinaHays350Transient non-communityGroundwater
38Hawks Shadow WineryHays350Transient non-communityPurchased surface water
39Oak Forest WSCHays339CommunityGroundwater
40River Oaks RanchHays336CommunityGroundwater
41Southwest TerritoryHays315CommunityGroundwater
42Mountain Crest WaterHays309CommunityGroundwater
43Horseshoe Ridge Rv ResortHays300Transient non-communityGroundwater
44Hays Hills Baptist ChurchHays300Transient non-communityGroundwater
45Henly Baseball ComplexHays300Transient non-communityGroundwater
46Sellers Wine BarHays300Transient non-communityPurchased surface water
47Driftwood Golf and Ranch ClubHays294CommunityPurchased surface water
48Solaro Estate WineryHays289Transient non-communityPurchased surface water
49Camp Young JudaeaHays285Transient non-communityGroundwater
50City of HaysHays270CommunityGroundwater

All other water systems in Hays County (66)

The remaining active systems filed under Hays County, largest first, with the population each reports serving.

Hays County water systems: frequently asked questions

How many public water systems are in Hays County, Texas?

EPA's SDWIS records file 118 active public water systems under Hays County, Texas: 52 community systems (44%), 12 non-transient non-community systems (10%) and 54 transient non-community systems (46%).

Who supplies drinking water in Hays County, TX?

The largest community water systems filed under Hays County are City of San Marcos (72,970 people served), City of Kyle (52,000 people served) and Texas State University - San Marcos (43,552 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.

Does Hays County's drinking water come from groundwater or surface water?

Of the 118 active public water systems in Hays County, 64% draw mainly on groundwater and 35% on surface water, counting purchased supplies. The largest system, City of San Marcos, uses surface water.

Where can I find a water quality report for Hays County?

Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 52 community systems are filed under Hays County, so the report to look for is the one from the system that supplies your address.

How can I check violations for a water system in Hays County?

Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.

More Texas water systems

About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Public water systems in Hays County, Texas”, https://aquacensus.com/water-systems/texas/hays (data as of October 1, 2026).