We read 12 results from City of Round Rock’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 130,662 people · Water system ID TX2460003 · Read the district’s 2025 report (opens in a new tab)
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Results from the 2025 report
Each number is copied from the district’s report and links to the page it’s printed on. Where the report lists several plants, wells or purchased water, the highest is shown.
| Contaminant | Result | Health goal | Legal limit | What it means |
|---|---|---|---|---|
| Radium (combined 226 + 228)highest measured · listed as a violation in the report · Entry points · 2025 report, page 3 | 1.5 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Total coliform bacteriahighest month · listed as a violation in the report · Distribution system · 2025 report, page 4 | 2.5 % positive | 0 % positive | 5 % positive | Above the health goalThe health goal is zero |
| Bariumaverage · range 0.04 to 0.05 · listed as a violation in the report · Entry points · 2025 report, page 3 | 0.05 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloramineaverage · range 1.8 to 2.41 · listed as a violation in the report · Distribution system · 2025 report, page 3 | 2.15 ppm | None set | 4 ppm | Below the legal limit |
| Cyanidehighest measured · listed as a violation in the report · Entry points · 2025 report, page 3 | 90 ppb | 150 ppb | 200 ppb | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 6.8 to 36.2 · listed as a violation in the report · Distribution system · 2025 report, page 3 | 21 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 28.7 to 94.5 · listed as a violation in the report · Distribution system · 2025 report, page 3 | 65 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · listed as a violation in the report · Entry points · 2025 report, page 3 | 0.21 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)average · listed as a violation in the report · Entry points · 2025 report, page 3 | 0.56 ppm | 10 ppm | 10 ppm | Below the health goal |
| Total dissolved solidsaverage · Entry points · 2025 report, page 4 | 302 ppm | — | 500 ppm guideline | Within the guideline |
| Turbidity (cloudiness)highest measured · range 0.03 to 0.27 · listed as a violation in the report · Treatment plant · 2025 report, page 4 | 0.27 NTU | None set | 1 NTU | Below the legal limit |
| Sodiumaverage · range 17 to 26 · Entry points · 2025 report, page 4 | 21.5 ppm | None set | None | No health limit |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper. 2 numbers we weren’t sure about are held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in City of Round Rock’s water between Oct 2024 and Jul 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFBS6.7 pptFound in 2 of 10 samples · highest resultNo federal limit in force for this one
- Lithium13.5 ppbFound in 6 of 10 samples · highest resultAbove EPA’s health reference level of 10 ppb (a guide, not a legal limit)
Source: EPA UCMR 5 occurrence data. The highest single result is shown; one high sample doesn’t mean every glass is that high.
What you can do
Nothing here is an emergency notice: if the district has a violation, it must tell customers directly. If you’d like to lower these at your tap, these are the treatments that remove them, and the catalog shows the models certified for each. Ranking is by certified removal; commissions never change the order.
Radium and uranium
Found: Radium (combined 226 + 228)
What removes it: Reverse osmosis.
Bacteria and viruses
Found: Total coliform bacteria
What removes it: UV purification (and tell your utility).
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