Is Thrall, TX Tap Water Safe to Drink?
Graded A-, with 2 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
87.1/100
waterverge.com Thrall, TX — Water Quality Report
Thrall's drinking water received a grade of A- (87.1 out of 100), indicating good water quality. The city's 1 water system serves approximately 975 residents using purchased surface water.
Lead levels were measured at 1.3 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 14 violations on record, including 11 health-based violations. 2 remain unresolved.
What to know about Thrall's water
Thrall ranks #123 out of 1067 cities in Texas for water quality, placing it above average in the state.
The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection.
As a small community water system, Thrall may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Thrall, TX water safe to drink?
Thrall's tap water meets most EPA standards but has areas that warrant attention. With a grade of A- (87.1/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 975 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Thrall
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Thrall's water quality assessment. Grade: A- (87.1/100).
Federal disaster declaration (FEMA DR-4879). Flood event — may have impacted local water infrastructure.
1 health-based. Contaminants: TTHM.
1 health-based. Contaminants: TTHM.
Contaminants: Lead and Copper Rule.
Federal disaster declaration (FEMA DR-3294). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Thrall's water supply.
Well within EPA limits.
Violation history
Thrall's water system has 14 total violations on record, including 11 health-based violations. 2 remain unresolved. 2 violations were issued in the last 5 years.
Flood & environmental risk
Williamson County has experienced 3 federally declared disasters since 2005. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies. Local water sources include Willis Ck Nr Granger, Granger Lk Nr Granger, San Gabriel Rv At Laneport, Brushy Ck At Fm 619 Nr Taylor, Lbc Dam 32 Nr Coupland.
Where does Thrall's water come from?
Thrall's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 1 water system serving approximately 975 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment. Nearby water bodies include Willis Ck Nr Granger (river), Granger Lk Nr Granger (lake), San Gabriel Rv At Laneport (river), Brushy Ck At Fm 619 Nr Taylor (river), Lbc Dam 32 Nr Coupland (lake).
What Thrall residents can do
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Thrall's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Top industrial polluters within 10 miles of Thrall
Industrial polluters nearby
Reported releases to surface water by facilities near Thrall, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
GEMINI - TAYLOR TAYLOR, TX76574 | — | — | 5.7 mi |
DURCON INC TAYLOR, TX76574 | — | — | 5.5 mi |
MM TAYLOR READY MIX THRALL, TX76578 | — | — | 1.4 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D3 — extreme droughtWilliamson County is currently in D3 (extreme drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Flood & disaster history
Williamson County has experienced 3 federally declared disasters since 2005. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 1.3 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Thrall compares by contaminant
Explore where Thrall ranks among all Texas cities for specific contaminants.
Water source & infrastructure
Where Thrall's water comes from
Thrall's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards.
These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge.
The system is operated by local government ownership and serves approximately 975 people through 1 water system.
Water bodies near Thrall
Thrall is located near 5 notable water bodies. As a surface water system, these water bodies may directly influence the city's drinking water supply.
Water systems serving Thrall
| System Name | PWSID | Population | Source |
|---|---|---|---|
| CITY OF THRALL | TX2460015 | 975 | SWP |
How Thrall compares
Full Texas rankings →Thrall's score of 87.1/100 is above the average of 46/100 among major Texas cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Texas rankings →About Thrall, TX
Wikipedia →Thrall is a city in Williamson County, Texas, United States. Its population was 816 at the 2020 census. The name Thrall was chosen by the community to honor the Rev. Homer S. Thrall, a Methodist minister and historian much admired by local settlers and residents. Thrall was founded in 1876.
Learn more about your water
Guides and resources related to Thrall's water quality findings.
Explore water quality across Williamson
Frequently asked questions
Is Thrall, TX tap water safe to drink?
Thrall's water quality earned a grade of A- (87.1/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #123 out of 1067 cities tested in Texas.
What contaminants are in Thrall's water?
Lead was measured at 1.3 ppb (90th percentile). 14 violations are on record.
How is Thrall's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Thrall?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Thrall's water come from?
Thrall's water is sourced from Purchased surface water. The city has 1 water system serving approximately 975 residents.
What health violations has Thrall's water system had?
Thrall has 11 health-based violations on record. The most recent violation was recorded in January 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 2 violations remain unresolved.
How does Thrall's water compare to other cities?
Thrall ranks #123 out of 1067 cities in Texas (better than 88% of state cities) and #4273 out of 15744 cities nationally (73th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Thrall's small water system affect quality?
Thrall's system serves approximately 975 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 14 violations on record.