PlainWater
Counties → Texas

Hays County, Texas

Water Systems
124
Population Served
306,942
Total Violations
5,506
475 health-based
PFAS Detected
10
of 11 tested

Violation Analysis

81.5%
Systems with Violations
44.4
Avg Violations per System
8.6%
Health-Based Violations

Water Source Types

GW
31 systems (25%)
SW
19 systems (15%)

PFAS Contamination

11
Systems Tested
10
PFAS Detected
90.9%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Hays Texas water systems by violation status, EPA SDWIS records.

No violations on record (2) One or more violations (48)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
City of San Marcos 72,970 35 Detected
City of Kyle 52,000 17 Detected
Texas State University - San Marcos 43,552 52 Clean
Goforth Sud 34,893 56 Detected
County Line Sud 19,609 26 Detected
City of Buda 13,830 142 Detected
Dripping Springs WSC 8,037 39 Clean
Plum Creek 7,065 24 Clean
Wimberley WSC 5,334 18 Clean
Hays Cisd Jack C Hays High School 4,048 143 Clean
Hays County Wcid 2 3,381 1 -
Woodcreek Utility Co 2 3,096 207 -
Hays County Wcid 1 2,850 5 -
Woodcreek Utility Co 1 2,700 43 -
South Buda Wcid 1 2,517 10 -
Headwaters at Barton Creek 2,315 21 -
Cimarron Park Water 2,079 3 -
Mid-Tex Utilities 1,569 10 -
Reunion Ranch Wcid 1,557 14 -
Meadow Woods Water Supply 1,554 22 -
Leisurewoods Water 1,338 29 -
Salt Lick Bar B Q 1,143 126 -
Oak Meadows 954 17 -
La Ventana Water Supply System 747 20 Clean
Ruby Ranch WSC 738 12 -
City of Mountain City 725 45 -
Elliott Ranch Water System 639 8 -
Promiseland Church San Marcos 625 30 -
Cedar Oak Mesa WSC 497 57 -
Sierra West Subdivision 495 29 -
Goldenwood West WSC 462 74 -
San Marcos Baptist Academy 450 27 -
Chaparral Water System Hays 444 220 -
Hays Youth Sports Complex 400 76 -
Huntington Estates 378 6 -
Trattoria Lisina 350 36 -
Hawks Shadow Winery 350 12 -
Oak Forest WSC 339 34 -
River Oaks Ranch 336 10 -
Southwest Territory 315 22 -
Mountain Crest Water 309 4 -
Hays Hills Baptist Church 300 49 -
Sellers Wine Bar 300 6 -
Henly Baseball Complex 300 34 -
Horseshoe Ridge RV Resort 300 0 -
Solaro Estate Winery 289 0 -
Camp Young Judaea 285 54 -
City of Hays 270 40 -
Skyline Ranch Estates WSC 261 28 -
Stripes 1509 250 16 -

Other Counties in Texas

Harris County
1,292 systems · 6,016,117 served · 78,495 violations
Dallas County
37 systems · 3,180,170 served · 2,618 violations
Bexar County
82 systems · 2,376,579 served · 13,955 violations
Tarrant County
113 systems · 2,099,244 served · 10,564 violations
Travis County
138 systems · 1,547,700 served · 7,557 violations
Collin County
35 systems · 1,246,210 served · 1,149 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Hays County? ▼
Hays County has 5,506 total drinking water violations across 124 water systems, of which 475 are health-based violations. 81.5% of systems have at least one violation.
How many people get water from Hays County systems? ▼
Water systems in Hays County serve approximately 306,942 people through 124 public water systems.
Has PFAS been detected in Hays County water? ▼
Of 11 water systems tested for PFAS in Hays County, 10 had PFAS detected (90.9% detection rate).
What types of water sources supply Hays County? ▼
Water systems in Hays County use GW (31 systems), SW (19 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 8.6% of Hays County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.