Hardness
Very hard258 mg/L
Results-table average; range 100–358
USGS very hard: over 180 mg/L as CaCO₃
Narrative separately says 249; use a home test for equipment settings.
2025
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Your local water, explained
Round Rock Water Quality Report
A very hard average with a wide annual range.
Round Rock's 2025 results table reports average hardness of 258 mg/L and a 100–358 range. Filtration plus softening is a useful starting point for scale control, with incoming-water testing for final settings.
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Utility data is a starting point. It is not a test of your tap or a live advisory. Sources checked October 23, 2026
Showing utility report
City of Round Rock
2025 report; each row keeps its measurement year
Results for City of Round Rock customers on system TX2460003. Other districts and private wells need their own reports.
Your water at a glance
See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.
Chloramine
Below stated benchmark2.15 ppm
Average; range 1.80–2.41
MRDL 4 ppm
2025
View source ↗TTHMs
Below limit65 ppb
Maximum LRAA; individual range 28.7–94.5
MCL 80 ppb, LRAA basis
A single result of 94.5 is not the annual compliance value.
2025
View source ↗HAA5
Below limit21 ppb
Maximum LRAA; individual range 6.8–36.2
MCL 60 ppb, LRAA basis
2025
View source ↗Fluoride
Below limit0.21 ppm
Reported high, low and average all 0.21
MCL 4 ppm
2025
View source ↗Lead
Cannot assess high or lowNot verified
No verified lead number used in this summary
No result shown does not mean absent. Check the linked report or obtain relevant testing.
2025 report review
View source ↗PFAS
Cannot assess high or lowNot verified
No compound-specific result assessed in this summary
This does not establish whether PFAS are present or absent. Check compound-specific testing before choosing treatment.
2025 report review
View source ↗Nitrate
Below limit1.63 ppm
Highest result; first results table range <0.25–1.63
MCL 10 ppm
2025
View source ↗View Full Water ReportOpen the measured results, dates, comparisons and original utility report.
The numbers behind your report
Selected useful results—not a replacement for the utility’s complete report. Older measurements retain their original year.
Open the complete utility report ↗
| What was measured | Reported amount | Sample year / source date | How to read it |
|---|---|---|---|
| Hardness | 258 mg/L Results-table average; range 100–358 | 2025View source ↗ | Very hard · USGS very hard: over 180 mg/L as CaCO₃Narrative separately says 249; use a home test for equipment settings. |
| Chloramine | 2.15 ppm Average; range 1.80–2.41 | 2025View source ↗ | Below stated benchmark · MRDL 4 ppm |
| Total trihalomethanes (TTHM) | 65 ppb Maximum LRAA; individual range 28.7–94.5 | 2025View source ↗ | Below limit · MCL 80 ppb, LRAA basisA single result of 94.5 is not the annual compliance value. |
| Haloacetic acids (HAA5) | 21 ppb Maximum LRAA; individual range 6.8–36.2 | 2025View source ↗ | Below limit · MCL 60 ppb, LRAA basis |
| Fluoride | 0.21 ppm Reported high, low and average all 0.21 | 2025View source ↗ | Below limit · MCL 4 ppm |
| Nitrate as nitrogen | 1.63 ppm Highest result; first results table range <0.25–1.63 | 2025View source ↗ | Below limit · MCL 10 ppm |
| Barium | 0.0545 ppm Highest result; range 0.0442–0.0545 | 2025View source ↗ | Below limit · MCL 2 ppm |
| Total dissolved solids | 302 ppm Reported high, low and average all 302 | 2025View source ↗ | Below reported secondary limit · Report secondary limit 1,000 ppmAn aesthetic benchmark, not a health or filtration performance claim. |
| Lead | Not verified No verified lead number used in this summary | 2025 report reviewView source ↗ | Cannot assess high or lowNo result shown does not mean absent. Check the linked report or obtain relevant testing. |
| PFAS | Not verified No compound-specific result assessed in this summary | 2025 report reviewView source ↗ | Cannot assess high or lowThis does not establish whether PFAS are present or absent. Check compound-specific testing before choosing treatment. |
ppm ≈ mg/L; ppb ≈ µg/L; ppt ≈ ng/L in drinking water. Hardness in gpg = mg/L as CaCO₃ ÷ 17.1. ND means not detected at the method’s reporting limit—not zero.
MCL is a maximum contaminant level. MRDL is a disinfectant limit. Lead/copper action levels use system sampling percentiles and are not a safe-tap threshold. TTHM/HAA5 compliance uses locational annual averages.
PFOA/PFOS comparisons use EPA’s 4 ppt values. Historical detections are not a present compliance finding; EPA assesses compliance using running annual averages. Rule implementation is being reviewed. EPA PFAS benchmarks and implementation ↗
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Source water. Lake Georgetown surface water, Edwards Aquifer groundwater and Lake Travis water treated by the Brushy Creek Regional Utility Authority.
Your provider needs its own report.
Continue with your home details for general filtration guidance. We will not use another utility’s numbers as your result.
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More about your local water
What this means for your home
Round Rock uses lake water and Edwards Aquifer groundwater. Its results table and narrative contain different hardness averages, both very hard; the discrepancy is disclosed below. An independent district should use its own distribution report even when buying Round Rock water.
A useful local question
Why does Round Rock's hardness vary?
Its water comes from multiple sources. The 2025 table spans 100–358 mg/L, so an annual average cannot set a softener for every home. A current test at the incoming supply confirms the correct setting.
Sources and methodology
We keep each utility’s results separate, show the reported sample year, and distinguish averages, maxima and tap-sampling percentiles. Hardness classifications use USGS ranges. Missing data stays unknown.
- City of Round Rock ↗2025 report; each row keeps its measurement year
- USGS hardness classification
- EPA PFAS benchmarks and implementation
Sources checked October 23, 2026
Your water → your home → your system
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Choose the system size, keep useful existing equipment, and review your filtration goals.
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