City of Round Rock water quality
Round Rock, TX · serves 130,662 people (37,492 connections) · Surface water · Local government · EPA ID TX2460003
Data: U.S. EPA · How we read the data · How we check it
Buys water from City of Austin Water & Wastewater, City of Georgetown, Brushy Creek Regional Utility Authority. Treated water bought from another system can carry that system's contaminants.
Summary
No federal limits exceeded in EPA data.
- PFAS
- Detected, below limit4 of 29 PFAS found at least once. All averages below the federal limits.
- Lead
- Below action level5.05 ppb (parts per billion) at the 90th percentile: 9 in 10 homes sampled were at or below it. Action level 15 ppb, falling to 10 ppb in Nov 2027. Monitoring period ending Dec 2023. Your home's pipes can make yours higher.
- Violations
- None health-basedNo health-based violations since 2016.
- Built before 1986, or not sure what your service line is made of? Check your service line and test your tap. Utility data can't show your pipes.
- Tested your own tap? Compare your result with these numbers. Moving? Compare this system with another.
- Read City of Round Rock's annual water quality report (Consumer Confidence Report). It lists every regulated contaminant tested and is usually on the utility's website or mailed with your bill, and you can also request it at (512) 218-5410. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 3 entry points tested Oct 2024 to Jul 2025. "Average" is the highest entry-point average (non-detects counted as zero), the way EPA compares UCMR 5 results to the limits. ppt = parts per trillion. These results do not determine compliance.
| Contaminant | Highest average |
|---|---|
| PFOA Not detected Limit 4 ppt | – |
| PFOS Not detected Limit 4 ppt | – |
| PFHxS Not detected Limit 10 ppt | – |
| PFNA Not detected Limit 10 ppt | – |
| HFPO-DA (GenX) Not detected Limit 10 ppt | – |
| Hazard Index (a combined score for PFHxS, PFNA, GenX and PFBS, where above 1 is over the limit) Detected, below limit Limit 1 | 0.0012 |
| PFBS Detected, below limit Guideline 2,000 ppt | 2.45 ppt |
| PFBA Detected, below limit Guideline 6,000 ppt | 2.55 ppt |
| PFHxA Detected, below limit Guideline 3,000 ppt | 1.85 ppt |
| PFPeA Detected, no limit | 3.35 ppt |
29 PFAS tested, 4 detected at least once. "Not detected" means below EPA's reporting limit (about 2 to 20 ppt depending on the chemical), not proven zero. PFAS not listed were not detected. The limits for PFHxS, PFNA, GenX and the Hazard Index were proposed for rescission in May 2026. That proposal is not final. Systems have until 2029 to meet the limits.
Lithium
Detected in 6 of 10 samples. Highest result 13.5 ppb. EPA's non-enforceable screening level is 10 ppb. Below screening level The screening level is how EPA decides what to study further, not a health limit. There is no federal limit for lithium and no filter is certified to remove it. About lithium.
Lead and copper
Latest 90th percentile: 5.05 ppb lead (Jan 2021 – Dec 2023). Below action level
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2021 – Dec 2023 | 5.05 ppb |
| Jul 2020 – Dec 2020 | 2 ppb |
| Jan 2020 – Jun 2020 | 3.4 ppb |
Earlier results (9)
| Jul 2018 – Dec 2018 | 4.3 ppb |
| Jan 2018 – Jun 2018 | 3.4 ppb |
| Jan 2013 – Dec 2015 | 5.3 ppb |
| Jan 2010 – Dec 2012 | 3.52 ppb |
| Jan 2005 – Dec 2007 | 8.1 ppb |
| Jan 1999 – Dec 2001 | 2.9 ppb |
| Jan 1996 – Dec 1998 | 5.5 ppb |
| Jan 1995 – Dec 1995 | 6.9 ppb |
| Jan 1994 – Dec 1994 | 4 ppb |
Lead comes from pipes and fixtures, not the source water, so it varies home to home. The 90th percentile means 9 in 10 sampled homes were at or below it. More on lead.
Violations
Health-based violations mean a contaminant exceeded a limit or a required treatment step was missed. Monitoring and reporting violations mean required tests or reports were late or missing, so the water's quality during that time is unknown. The total includes every violation in EPA's records, most of them paperwork.
Earlier EPA testing (2013–2020)
| Contaminant | Highest | Guideline |
|---|---|---|
| Manganese | 3 ppb | 300 ppb |
| Strontium | 1.02 ppm | 1.5 ppm |
| Vanadium | 2.65 ppb | 21 ppb |
| Molybdenum | 2.16 ppb | 40 ppb |
| Chlorate | 110 ppb | 210 ppb |
| Chromium-6 | 0.16 ppb | – |
Where it serves
ZIP codes the system reported serving: 78664, 78665, 78680, 78681, 78682, 78683, 78728
Nearby utilities
- Manville Water Supply Corporation Round Rock · same area · PFAS above limit
- Windermere Community Water System Round Rock · same area · PFAS above limit
- City of Pflugerville Pflugerville · 6 mi · PFAS above limit
- City of Cedar Park Cedar Park · 10 mi
- City of Georgetown Georgetown · 10 mi
- City of Leander Leander · 12 mi
Questions
Is City of Round Rock water safe to drink?
City of Round Rock has no health-based violations since 2016. EPA testing found no PFAS above the federal limits. Federal data can't tell you about your own pipes: lead comes from service lines and plumbing, so test your tap if your home was built before 1986. For the official word, read the utility's annual Consumer Confidence Report.
Does City of Round Rock water have PFAS?
Yes. EPA's 2023–2025 testing of City of Round Rock found 4 PFAS at least once. None of the averages were above the federal limits.
What is the lead level in City of Round Rock water?
The most recent 90th-percentile lead result for City of Round Rock is 5.05 ppb, for the period ending Dec 2023. The federal action level is 15 ppb, falling to 10 ppb in November 2027. The 90th percentile means 9 in 10 homes sampled were at or below this number. Individual homes can be higher.
Check these numbers yourself
Every figure on this page comes from public EPA records. You don't have to take our word for it:
- EPA's own report for TX2460003: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID TX2460003).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask City of Round Rock at (512) 218-5410, or see EPA's guide to finding it.
Found something that doesn't match? Tell us and we'll check it against EPA's records. How we check our data.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.