Is there PFAS in City of Round Rock water?
Yes, at low levels. 4 PFAS were detected, all below EPA's 2024 limits.
City of Round Rock
Serves 130,662 people · 10 PFOA samples from 3 sampling points · Oct 2024 to Jul 2025
PFAS found, below EPA limits
PFOA Perfluorooctanoic acid
not detected
PFOS Perfluorooctanesulfonic acid
not detected
Hazard index GenX, PFBS, PFNA, PFHxS combined
not detected
Also detected, no federal limit: PFPeA, PFBS, PFBA, PFHxA.
City of Round Rock is a public water system drawing on surface water, based in Round Rock, Texas, serving about 130,662 people, including Round Rock, Austin. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 10 times across 3 sampling points between Oct 2024 and Jul 2025.
Every PFAS detected
Not detected: PFUnA, PFPeS, 6:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, 11Cl-PF3OUdS, 4:2 FTS, 8:2 FTS, PFMPA, PFMBA, NFDHA, PFEESA, NMeFOSAA, PFTA, PFHxS, NEtFOSAA, PFDoA, PFHpS, PFDA, PFNA, PFOS, PFOA, PFHpA, PFTrDA.
Lithium, tested in the same program: highest 13.5 ppb, detected in 6 of 10 samples. EPA's health-based screening level is 10 ppb.
What the EPA limits mean here
In April 2024 EPA set enforceable limits of 4 ppt for PFOA and PFOS, 10 ppt each for PFHxS, PFNA and GenX, and a hazard index of 1 for mixtures. Utilities were given until 2029 to comply. In May 2026 EPA proposed keeping only the PFOA and PFOS limits and moving that deadline to 2031. Until that proposal is final, the 2024 limits stand.
Compliance is judged on a running annual average at each entry point, so we show the average at this system's worst sampling point next to its single highest result. UCMR 5 results do not by themselves put a utility in or out of compliance.
What you can do at home
Levels here are under EPA's limits, so no treatment is required. If you want them lower anyway, a certified reverse osmosis system under the sink handles drinking water, and a whole-house carbon filter also takes out the chlorine or chloramine your utility adds.
Other systems in Texas
All 1154 tested systems in Texas
ZIP codes served
78664 78665 78680 78681 78682 78683 78728
As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.
Cite this page
Well & Tap. "PFAS in City of Round Rock water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID TX2460003. https://wellandtap.com/pfas/texas/city-of-round-rock/
About this data
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID TX2460003). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
