Is Round Rock, TX tap water safe?
Data: U.S. EPA · How we read the data · How we check it
Summary
No federal limits exceeded in EPA data for City of Austin Water & Wastewater. 6 PFAS were detected below the limits.
14 public water systems serve parts of Round Rock. The largest, City of Austin Water & Wastewater, serves 1.1 million people, and 2 systems here had PFAS above a federal limit. Your water bill names your system.
Largest system
City of Austin Water & Wastewater
1.1 million people · Surface water · EPA ID TX2270001
| PFAS | Highest average | Limit |
|---|---|---|
| PFOA Not detected | – | 4 ppt |
| PFOS One sample above limit | 1.2 ppt | 4 ppt |
| PFHxS Detected, below limit | 3.65 ppt | 10 ppt |
| PFNA Not detected | – | 10 ppt |
| HFPO-DA (GenX) Not detected | – | 10 ppt |
ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.
Lead: 0 ppb at the 90th percentile (Dec 2024, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 5
Across Texas, 28 of 1,130 water systems EPA tested had PFAS above a 2024 federal limit, and 13 systems were above the lead action level in results from the last five years. Texas results.
Round Rock homes and lead pipes
Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. City of Austin Water & Wastewater's service line inventory lists 0 lead lines and 777 galvanized lines that need replacing (as of 2024-10). Look up your address. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.
Housing: Census American Community Survey 2020–2024 5-year estimates for Round Rock city (tables B25034, B25003). Estimates for small places have a margin of error.
Which system serves your ZIP code
Based on the ZIP codes each system reported serving. Boundaries don't follow ZIP lines exactly, so your water bill is the final word.
| System | ZIP codes in Round Rock |
|---|---|
| City of Austin Water & Wastewater 1.1 million people | 78664, 78681 |
| City of Round Rock 130,662 people | 78665 |
Other water systems serving Round Rock
- City of Round Rock130,662 people · Surface water · Texas · lists this cityNo PFAS above limits
- Manville Water Supply Corporation39,648 people · Purchased surface water · Texas · reported ZIPs herePFOS above limitAlso: PFNA above limit · PFAS Hazard Index above limit · Total trihalomethanes (TTHM) violations
- Jonah Water Special Utility District29,861 people · Purchased surface water · Texas · reported ZIPs hereTotal trihalomethanes (TTHM) violationsAlso: PFOA detected · PFOS detected · PFHxS detected
- Windermere Community Water System21,231 people · Purchased surface water · Texas · reported ZIPs herePFOS above limitAlso: PFHxS detected · Lithium above screening level
- Brushy Creek Municipal Utility District18,314 people · Surface water · Texas · reported ZIPs herePFHxS detectedAlso: Lithium above screening level
- Travis County Water Control & Improvement District 109,204 people · Purchased surface water · Texas · reported ZIPs herePFOS detectedAlso: PFHxS detected
7 more systems
- Williamson County Wsid 38,265 people · Purchased groundwater · Texas · reported ZIPs herePFNA detectedAlso: Lithium above screening level
- Travis County Water Control & Improvement District 185,733 people · Surface water · Texas · reported ZIPs hereTotal trihalomethanes (TTHM) violations
- Fern Bluff Municipal Utility District5,682 people · Purchased surface water · Texas · reported ZIPs hereNo PFAS above limits
- Williamson County Municipal Utility District 114,248 people · Purchased surface water · Texas · reported ZIPs hereNo PFAS above limits
- Williamson County Municipal Utility District 103,513 people · Purchased surface water · Texas · reported ZIPs hereLithium above screening level
- Paloma Lake Municipal Utility District 13,111 people · Purchased surface water · Texas · reported ZIPs hereNot in EPA's PFAS sample
- Travis County Municipal Utility District 181,491 people · Purchased surface water · Texas · reported ZIPs hereNo PFAS above limits
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| Pflugerville 6 mi City of Austin Water & Wastewater | None above limits | 0 ppb |
| Hutto 7 mi Manville Water Supply Corporation | Above limit | 1.41 ppb |
| Cedar Park 10 mi City of Austin Water & Wastewater | None above limits | 0 ppb |
| Georgetown 10 mi City of Georgetown | None above limits | 4.81 ppb |
| Leander 12 mi City of Austin Water & Wastewater | None above limits | 0 ppb |
| Austin 17 mi City of Austin Water & Wastewater | None above limits | 0 ppb |
Questions
Is Round Rock tap water safe to drink?
City of Austin Water & Wastewater had 5 health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.
Who supplies water in Round Rock, TX?
14 public water systems serve parts of Round Rock. The largest is City of Austin Water & Wastewater (1.1 million people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.
Does Round Rock tap water have PFAS?
City of Austin Water & Wastewater had 6 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.
Do Round Rock homes have lead pipes?
Census estimates put 11% of Round Rock homes as built before 1980 (Texas: 33%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. City of Austin Water & Wastewater's service line inventory lists 0 lead lines. The only way to know for your home is to check the line where it enters the house and test your tap.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.