Hardness
Soft utility average1.34gpg
Utility mineral table: range 1.05–1.87 gpg; average ≈23 mg/L as CaCO₃.
USGS: soft ≤60; moderately hard 61–120 mg/L as CaCO₃.
Utility brewing-water table · sample year not statedView source
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Gwinnett County water quality report
Showing utility report
Gwinnett County Department of Water Resources
2025 water quality report
Public water system GA1350004. Use these measurements only for this system; they do not describe private wells or every address in Gwinnett County.
Your water at a glance
See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.
Chlorine
Below 4 mg/L disinfectant limit1.43mg/L
Utility average; range 0.00–2.64.
MRDL in the utility report: 4 mg/L.
2025View source
Fluoride
Below 4 mg/L limit0.83mg/L
Utility average; range 0.40–1.01.
MCL in the utility report: 4 mg/L.
2025View source
Total trihalomethanes (TTHM)
Below 80 µg/L limit72.8µg/L
Highest reported locational running annual average; table range 13.5–72.8.
MCL in the utility report: 80 µg/L.
2025View source
Haloacetic acids (HAA5)
Below 60 µg/L limit29.6µg/L
Highest reported locational running annual average; table range 12.0–29.6.
MCL in the utility report: 60 µg/L.
2025View source
Nitrate/nitrite
Below 10 mg/L limit0.82mg/L
Average; nitrate and nitrite combined, range 0.78–0.86.
MCL in the utility report: 10 mg/L.
2025View source
Lead
No sampled sites over level0 of 50sites above action level
Prior tap round; the utility table lists zero sites over its lead action level.
This site count does not establish the concentration in an individual home.
2023View source
Turbidity
Treatment target met0.16NTU
Highest turbidity detected.
The report says 100% of samples were below 0.3 NTU.
2025View source
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The figures below are provider-specific. They are not a countywide average.
| Utility | Hardness | Hardness source |
|---|---|---|
| 1.34 gpg · Soft utility average | Utility brewing-water table · sample year not stated |
View Full Water ReportOpen the measured results, dates, comparisons and original utility report.
The numbers behind your report
Selected results with the original sampling dates and measurement basis. Open the utility report for every parameter, notice and footnote.
Open the complete utility report ↗
| What was measured | Reported amount | Sample year / source date | How to read it |
|---|---|---|---|
| Hardness | 1.34 gpgUtility mineral table: range 1.05–1.87 gpg; average ≈23 mg/L as CaCO₃. | Utility brewing-water table · sample year not statedView source ↗ | Soft utility average |
| Chlorine | 1.43 mg/LUtility average; range 0.00–2.64. | 2025View source ↗ | Below 4 mg/L disinfectant limitMRDL in the utility report: 4 mg/L. |
| Fluoride | 0.83 mg/LUtility average; range 0.40–1.01. | 2025View source ↗ | Below 4 mg/L limitMCL in the utility report: 4 mg/L. |
| Total trihalomethanes (TTHM) | 72.8 µg/LHighest reported locational running annual average; table range 13.5–72.8. | 2025View source ↗ | Below 80 µg/L limitMCL in the utility report: 80 µg/L. |
| Haloacetic acids (HAA5) | 29.6 µg/LHighest reported locational running annual average; table range 12.0–29.6. | 2025View source ↗ | Below 60 µg/L limitMCL in the utility report: 60 µg/L. |
| Nitrate/nitrite | 0.82 mg/LAverage; nitrate and nitrite combined, range 0.78–0.86. | 2025View source ↗ | Below 10 mg/L limitMCL in the utility report: 10 mg/L. |
| Lead | 0 of 50 sites above action levelPrior tap round; the utility table lists zero sites over its lead action level. | 2023View source ↗ | No sampled sites over levelThis site count does not establish the concentration in an individual home. |
| Turbidity | 0.16 NTUHighest turbidity detected. | 2025View source ↗ | Treatment target metThe report says 100% of samples were below 0.3 NTU. |
| Copper | 0.18 mg/L90th-percentile tap result. The report’s site count and listed range do not agree; ask the utility about individual samples. | 2023View source ↗ | Below 1.3 mg/L action levelAL in the utility report: 1.3 mg/L. |
In drinking water, ppm ≈ mg/L, ppb ≈ µg/L and ppt ≈ ng/L. Calculated hardness in grains per US gallon (gpg) = mg/L as CaCO₃ ÷ 17.118, rounded to one decimal. ND means below the reporting limit, not zero.
MCL means a regulatory contaminant limit; MRDL is a disinfectant limit. Lead and copper use tap-sampling action levels. TTHM and HAA5 compliance is assessed using running averages at specific locations, not the highest single sample.
PFAS results depend on the compound, sample location, year and reporting limit. A missing result or nondetect is not proof of zero PFAS. EPA PFAS benchmarks and implementation ↗
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Source water. Gwinnett draws from Lake Sidney Lanier and treats the water at its Shoal Creek and Lanier filter plants.
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More about your local water
What this means for your home
Gwinnett’s utility reports soft water: 1.34 grains per gallon on average.
The hardness data comes from the utility’s brewing-water table. The annual drinking-water report supplies the disinfectant and contaminant results; the two tables serve different purposes.
A useful local question
Is 1.34 grains per gallon hard water?
No. It is about 23 mg/L as calcium carbonate, in the USGS soft range. Confirm your own reading if you see persistent scale or the name on your bill differs.
Sources and methodology
Results retain the utility, sample year, units and comparison used in the source. Hardness is shown separately as a utility measurement, utility guidance or regional estimate. USGS categories describe mineral content, not drinking-water safety.
Different name on your water bill?
Use the published report for your own retail water system. These sources can help identify the right report; a county or ZIP alone cannot confirm service.
- Gwinnett County Department of Water Resources ↗2025 water quality report
- Gwinnett County Department of Water Resources · Hardness source ↗
- USGS hardness classification
- EPA PFAS benchmarks and implementation
Sources reviewed November 5, 2026.
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