PlainWater
Counties → Texas

Williamson County, Texas

Water Systems
52
Population Served
703,146
Total Violations
2,502
233 health-based
PFAS Detected
17
of 17 tested

Violation Analysis

98.1%
Systems with Violations
48.1
Avg Violations per System
9.3%
Health-Based Violations

Water Source Types

SW
30 systems (58%)
GW
20 systems (38%)

PFAS Contamination

17
Systems Tested
17
PFAS Detected
100.0%
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

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

No violations on record (0) One or more violations (50)

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 Georgetown 191,639 15 Detected
City of Round Rock 130,662 16 Detected
City of Leander 98,330 29 Detected
City of Cedar Park 86,939 37 Detected
Jonah Water Sud 29,861 69 Detected
City of Hutto 29,580 25 Clean
City of Taylor 20,622 43 Detected
Brushy Creek MUD 18,314 45 Detected
Sonterra MUD 16,614 23 Detected
Jarrell Schwertner WSC 9,681 32 Detected
City of Liberty Hill 8,777 136 -
Williamson County Wsid 3 8,265 33 Detected
Block House MUD 6,618 5 Detected
Williamson Travis County MUD 1 5,793 28 Clean
Fern Bluff MUD 5,682 1 Detected
Williamson County MUD 11 4,248 1 Detected
Williamson County MUD 10 3,513 4 Detected
City of Jarrell 3,450 13 -
Paloma Lake MUD 1 3,111 6 -
City of Bartlett 2,950 241 Clean
Vista Oaks MUD 2,724 17 -
Paloma Lake MUD 2 2,265 1 -
City of Granger 1,914 63 -
Blessing Mobile Home Park 1,518 68 -
Durham Park WSC 1,251 83 -
City of Florence 1,136 98 -
City of Thrall 975 44 -
Tal Tex 939 9 -
San Gabriel River Ranches 891 218 -
Walsh Ranch MUD 714 4 -
Brushy Bend Park 645 15 -
South San Gabriel Ranches 510 21 -
Sunny Creek Mhc 510 266 -
High Gabriel WSC 492 309 -
Inner Space Cavern 310 33 -
San Gabriel River RV Camp Resort 300 16 -
Round Rock Ranch PUD Utility Company 285 12 -
Smilin V Ranch 256 4 -
Mesa Rosa Restaurant 250 76 -
Community Christian Church 180 43 -
Txdps Tactical Training Center 124 26 -
Round Rock Roller Rink 100 27 -
Liberty Greenline 46 47 -
200 County Road 314 37 103 -
County Cottage Lines 29 1 -
Premier Athletic Complex 25 28 -
Liberty Hill Tri-Air Park 25 37 -
Live Oak Water Delivery 25 20 -
Juniper RV Park 21 6 -
Brazos River Authority Granger Lake Regi 0 1 -

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 Williamson County? ▼
Williamson County has 2,502 total drinking water violations across 52 water systems, of which 233 are health-based violations. 98.1% of systems have at least one violation.
How many people get water from Williamson County systems? ▼
Water systems in Williamson County serve approximately 703,146 people through 52 public water systems.
Has PFAS been detected in Williamson County water? ▼
Of 17 water systems tested for PFAS in Williamson County, 17 had PFAS detected (100.0% detection rate).
What types of water sources supply Williamson County? ▼
Water systems in Williamson County use SW (30 systems), GW (20 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. 9.3% of Williamson 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.