Hardness
Moderately hard93 mg/L as CaCO₃
Annual average; range 70–126
USGS: moderately hard 61–120 mg/L
Scale-related measure; not a health limit.
2025
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Your local water, explained
Austin Water Quality Report
Moderately hard water, with useful monthly plant updates.
Austin Water's 2025 hardness average was 93 mg/L as calcium carbonate. September 2026 plant averages were 68–73 mg/L. Both point to moderately hard water, while a home's result still depends on its actual supply.
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Your water
Match the name on your water bill.
The report follows your water provider—not your ZIP code or county boundary.
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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
Austin Water
2025 report; each row keeps its measurement year
Results for Austin Water customers on system TX2270001. 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.
Chloramines
Below stated benchmark2.3 ppm
Distribution-system average; range 0.06–3.1
MRDL 4 ppm
Match treatment to chloramine rather than assuming a chlorine-only claim applies.
2025
View source ↗TTHMs
Below limit45.5 ppb
Highest locational running annual average; individual range 31.4–53.9
MCL 80 ppb, LRAA basis
2025
View source ↗HAA5
Below limit15.6 ppb
Highest locational running annual average; individual range 8.4–21.1
MCL 60 ppb, LRAA basis
2025
View source ↗Fluoride
Below limit0.71 ppm
Highest treatment-plant result; average 0.66, range 0.59–0.71
MCL 4 ppm
2025
View source ↗Lead
Below action level<1.0 ppb
90th-percentile tap sampling; no sample over 15 ppb
Report action level 15 ppb; MCLG 0
Not a guarantee for a particular home's plumbing.
2024
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 limit0.11 ppm
Highest treatment-plant result; average 0.05, range 0–0.11
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 | 93 mg/L as CaCO₃ Annual average; range 70–126 | 2025View source ↗ | Moderately hard · USGS: moderately hard 61–120 mg/LScale-related measure; not a health limit. |
| Chloramines | 2.3 ppm Distribution-system average; range 0.06–3.1 | 2025View source ↗ | Below stated benchmark · MRDL 4 ppmMatch treatment to chloramine rather than assuming a chlorine-only claim applies. |
| Total trihalomethanes (TTHM) | 45.5 ppb Highest locational running annual average; individual range 31.4–53.9 | 2025View source ↗ | Below limit · MCL 80 ppb, LRAA basis |
| Haloacetic acids (HAA5) | 15.6 ppb Highest locational running annual average; individual range 8.4–21.1 | 2025View source ↗ | Below limit · MCL 60 ppb, LRAA basis |
| Fluoride | 0.71 ppm Highest treatment-plant result; average 0.66, range 0.59–0.71 | 2025View source ↗ | Below limit · MCL 4 ppm |
| Nitrate as nitrogen | 0.11 ppm Highest treatment-plant result; average 0.05, range 0–0.11 | 2025View source ↗ | Below limit · MCL 10 ppm |
| Lead | <1.0 ppb 90th-percentile tap sampling; no sample over 15 ppb | 2024View source ↗ | Below action level · Report action level 15 ppb; MCLG 0Not a guarantee for a particular home's plumbing. |
| Copper | <0.008 ppm 90th-percentile tap sampling; no sample over 1.3 ppm | 2024View 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 ↗
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Source water. Surface water from the Lower Colorado River through Lake Travis and Lake Austin, treated at Handcox, Davis and Ullrich plants.
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.
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More about your local water
What this means for your home
Austin Water treats Highland Lakes surface water and publishes monthly plant summaries as well as an annual report. September 2026 averages were 69 mg/L at Davis, 73 at Ullrich and 68 at Handcox; those are plant results, not a new unweighted city average.
A useful local question
Is Austin water as hard as nearby Central Texas cities?
Not necessarily. Austin Water's 2025 average was 93 mg/L, classified as moderately hard. Use Austin Water's own report rather than assuming Round Rock, Georgetown or private-well hardness applies.
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.
- Austin Water ↗2025 report; each row keeps its measurement year
- September 2026 treatment-plant summary ↗
- Austin Water · Hardness source ↗
- USGS hardness classification
- EPA PFAS benchmarks and implementation
Sources checked October 23, 2026
Your water → your home → your system
Turn your report into a plan for your home.
Choose the system size, keep useful existing equipment, and review your filtration goals.
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