Hardness
Very hard258mg/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.
2025View source
- 1Your water
- 2Your home
- 3Your system
Williamson County Water Quality Report
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 benchmark2.15ppm
Average; range 1.80–2.41
MRDL 4 ppm
2025View source
TTHMs
Below limit65ppb
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.
2025View source
HAA5
Below limit21ppb
Maximum LRAA; individual range 6.8–36.2
MCL 60 ppb, LRAA basis
2025View source
Fluoride
Below limit0.21ppm
Reported high, low and average all 0.21
MCL 4 ppm
2025View 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 reviewView 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 reviewView source
Nitrate
Below limit1.63ppm
Highest result; first results table range <0.25–1.63
MCL 10 ppm
2025View source
Showing utility report
City of Georgetown Water Utility
2025 report; each row keeps its measurement year
Results for City of Georgetown Water Utility customers on system TX2460001. 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.
Hardness
Hard to very hard176–178 or 309–320 mg/L as CaCO₃
Two plant-system bands; not one system-wide average
USGS hard 121–180; very hard >180
May 8, 2026 utility guidance, historical plant dataView source
Total chlorine
Average below benchmark3ppm
Average; range 0.06–4.54
MRDL 4 ppm
Utility normally uses chloramine. A single maximum is not by itself the compliance calculation.
2025View source
TTHMs
Below limit in 202573.65ppb
Highest LRAA; individual range 14.5–125.3
MCL 80 ppb, LRAA basis
Annual historical result, not current advisory status.
2025View source
HAA5
Below limit in 202539.83ppb
Highest LRAA; individual range 3.7–75.7
MCL 60 ppb, LRAA basis
2025View source
Fluoride
Below limit0.2ppm
Highest result; average 0.19, range 0.02–0.2
MCL 4 ppm
Report says fluoride is not added by the City.
2025View source
Lead
90th percentile below action level<2.2ppb
90% of samples below 2.2; one sample reached 24 ppb and exceeded 15
Report action level 15 ppb; MCLG 0
One home sampling result exceeded the action level; this is not a guarantee for an individual tap.
2023View 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 reviewView source
Nitrate
Below limit3.19ppm
Highest result; average 1.11, range 0.08–3.19
MCL 10 ppm
2025View source
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.
Find My Water System →Private well? Start with a current water test.
A city report cannot establish a well’s water quality. Well-water treatment depends on your test results and site conditions.
Explore well-water systems →Water hardness by provider
The figures below are provider-specific. They are not a countywide average.
| Utility | Hardness | Hardness source |
|---|---|---|
| 258 mg/L · Very hard · USGS very hard: over 180 mg/L as CaCO₃ | 2025 | |
| 176–178 or 309–320 mg/L as CaCO₃ · Hard to very hard · USGS hard 121–180; very hard >180 | May 8, 2026 utility guidance, historical plant data |
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 ↗
Turn your report into a plan for your home.
Choose the system size, keep useful existing equipment, and review your filtration goals.
Source water. Lake Georgetown surface water, Edwards Aquifer groundwater and Lake Travis water treated by the Brushy Creek Regional Utility Authority.
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 | 176–178 or 309–320 mg/L as CaCO₃ Two plant-system bands; not one system-wide average | May 8, 2026 utility guidance, historical plant dataView source ↗ | Hard to very hard · USGS hard 121–180; very hard >180 |
| Total chlorine | 3 ppm Average; range 0.06–4.54 | 2025View source ↗ | Average below benchmark · MRDL 4 ppmUtility normally uses chloramine. A single maximum is not by itself the compliance calculation. |
| Total trihalomethanes (TTHM) | 73.65 ppb Highest LRAA; individual range 14.5–125.3 | 2025View source ↗ | Below limit in 2025 · MCL 80 ppb, LRAA basisAnnual historical result, not current advisory status. |
| Haloacetic acids (HAA5) | 39.83 ppb Highest LRAA; individual range 3.7–75.7 | 2025View source ↗ | Below limit in 2025 · MCL 60 ppb, LRAA basis |
| Fluoride | 0.2 ppm Highest result; average 0.19, range 0.02–0.2 | 2025View source ↗ | Below limit · MCL 4 ppmReport says fluoride is not added by the City. |
| Nitrate as nitrogen | 3.19 ppm Highest result; average 1.11, range 0.08–3.19 | 2025View source ↗ | Below limit · MCL 10 ppm |
| Lead | <2.2 ppb 90% of samples below 2.2; one sample reached 24 ppb and exceeded 15 | 2023View source ↗ | 90th percentile below action level · Report action level 15 ppb; MCLG 0One home sampling result exceeded the action level; this is not a guarantee for an individual tap. |
| Copper | <0.18 ppm 90% of samples below 0.18; range 0.002–1.1; no samples over 1.3 | 2023View source ↗ | Below action level · Action level 1.3 ppmA system sampling percentile is not a measurement of your faucet. |
| 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 ↗
Turn your report into a plan for your home.
Choose the system size, keep useful existing equipment, and review your filtration goals.
Source water. Surface water and groundwater. Surface sources include Lake Georgetown and Lake Stillhouse via Brazos River Authority; contracted Lake Travis water is treated by Leander and Round Rock, and Round Rock also treats Lake Georgetown water before interconnection.
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More about your local water
What this means for your home
Hardness varies by utility—and by supplying plant.
Georgetown's plant systems and Round Rock's surface-water/groundwater blend produce different hardness patterns. Independent districts need their own reports. A licensed plumber can measure incoming hardness and confirm the final softener settings.
Related city reports
A useful local question
Why can nearby Williamson County homes need different softener settings?
Their suppliers, treatment plants and source blends may differ. Georgetown publishes separate hardness bands, and Round Rock reports a wide annual range. Choose the provider first, then confirm hardness at the home.
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
- City of Georgetown Water Utility ↗2025 report; each row keeps its measurement year
- City of Georgetown Water Utility · Hardness source ↗
- USGS hardness classification
- EPA PFAS benchmarks and implementation
Sources checked October 23, 2026
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