2026 water quality report · 2025 reporting year
Public water system GA0890001. Use these measurements only for this system; they do not describe private wells or every address in DeKalb County.
See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.
29mg/L as CaCO₃
MyTapWater estimates 1.7 gpg for Dekalb County from USGS data. This is regional context, not measured hardness for this utility or your tap.
USGS: soft ≤60; moderately hard 61–120 mg/L as CaCO₃.
1.70mg/L
Annual average; range 1.63–1.77.
MRDL in the utility report: 4 mg/L.
0.8mg/L
Annual average; range 0.5–1.5.
MCL in the utility report: 4 mg/L.
28µg/L
Annual average as defined in the county table; range 15.7–50.9.
MCL in the utility report: 80 µg/L.
9.0µg/L
Annual average; range 4.9–19.2.
MCL in the utility report: 60 µg/L.
0.8mg/L
Annual average; range 0.6–0.8.
MCL in the utility report: 10 mg/L.
5.6µg/L
90th percentile; sample range 0–930 µg/L.
The system percentile was below the report’s 15 µg/L action level. A home result can differ markedly.
0.20NTU
Highest detected turbidity.
The accompanying monthly percentage is 99.00% below 0.3 NTU.
Continue with your home details for general filtration guidance. We will not use another utility’s numbers as your result.
Find My Water System →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 →The figures below are provider-specific. They are not a countywide average.
| Utility | Hardness | Hardness source |
|---|---|---|
| 29 mg/L as CaCO₃ · Soft regional estimate | Regional estimate · sample year not identified |
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 | 29 mg/L as CaCO₃MyTapWater estimates 1.7 gpg for Dekalb County from USGS data. This is regional context, not measured hardness for this utility or your tap. | Regional estimate · sample year not identifiedView source ↗ | Soft regional estimate |
| Free chlorine | 1.70 mg/LAnnual average; range 1.63–1.77. | 2025View source ↗ | Below 4 mg/L disinfectant limitMRDL in the utility report: 4 mg/L. |
| Fluoride | 0.8 mg/LAnnual average; range 0.5–1.5. | 2025View source ↗ | Below 4 mg/L limitMCL in the utility report: 4 mg/L. |
| Total trihalomethanes (TTHM) | 28 µg/LAnnual average as defined in the county table; range 15.7–50.9. | 2025View source ↗ | Below 80 µg/L limitMCL in the utility report: 80 µg/L. |
| Haloacetic acids (HAA5) | 9.0 µg/LAnnual average; range 4.9–19.2. | 2025View source ↗ | Below 60 µg/L limitMCL in the utility report: 60 µg/L. |
| Nitrate as nitrogen | 0.8 mg/LAnnual average; range 0.6–0.8. | 2025View source ↗ | Below 10 mg/L limitMCL in the utility report: 10 mg/L. |
| Lead | 5.6 µg/L90th percentile; sample range 0–930 µg/L. | 2025View source ↗ | One tap above action levelThe system percentile was below the report’s 15 µg/L action level. A home result can differ markedly. |
| Turbidity | 0.20 NTUHighest detected turbidity. | 2025View source ↗ | Below 1 NTU ceilingThe accompanying monthly percentage is 99.00% below 0.3 NTU. |
| Copper | 0.02 mg/L90th percentile; range 0.000–0.038; no taps over the action level. | 2025View 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 ↗
Choose the system size, keep useful existing equipment, and review your filtration goals.
Source water. DeKalb draws surface water from the Chattahoochee River. These results follow the county utility’s water into its distribution system.
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More about your local water
The system lead result and the highest household sample tell different stories.
The regional hardness estimate is separate from DeKalb’s measurements. For a lead concern, use a lab sample from the relevant faucet and check the exact filter model’s lead-reduction claim.
A useful local question
No. It is a percentile across sampled taps. Household plumbing can change a tap result, and one of DeKalb’s sampled sites exceeded the report’s action level.
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.
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.
Sources reviewed November 5, 2026.
Your water → your home → your system
Choose the system size, keep useful existing equipment, and review your filtration goals.