We read 12 results from Gwinnett Co. Dept. of Water Resources’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 975,000 people · Water system ID GA1350004 · Read the district’s 2025 report (opens in a new tab)
Open this district in the water lookupCompare with your own test results, see the district map and get matched filters.
Results from the 2025 report
Each number is copied from the district’s report and links to the page it’s printed on. Where the report lists several plants, wells or purchased water, the highest is shown.
| Contaminant | Result | Health goal | Legal limit | What it means |
|---|---|---|---|---|
| Total coliform bacteriahighest month · range ND to 0.65 · Distribution system · 2025 report, page 8 | 0.65 % positive | 0 % positive | 5 % positive | Above the health goalThe health goal is zero |
| Bromateaverage · Treatment plants · 2025 report, page 8 | Not detected | 0.1 ppb | 10 ppb | Not detected |
| Chlorineaverage · range ND to 2.64 · Distribution system · 2025 report, page 8 | 1.43 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 50 homes tested, 0 over the action level · sampled 2023 · Customer taps (50 homes) · 2025 report, page 8 | 0.18 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 12 to 29.6 · Distribution system · 2025 report, page 8 | 29.6 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 13.5 to 72.8 · Distribution system · 2025 report, page 8 | 72.8 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.4 to 1.01 · System-wide · 2025 report, page 8 | 0.83 ppm | 1 ppm | 4 ppm | Below the health goal |
| Lead90th percentile of 50 homes tested, 1 over the action level · printed as 0 ppm · sampled 2023 · Customer taps (50 homes) · 2025 report, page 8 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range 0.78 to 0.86 · System-wide · 2025 report, page 8 | 0.82 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFOA (a PFAS)as reported · Treatment plants · 2025 report, page 8 | Not detected | 0.007 ppt | 4 ppt from 2029 | Not detected |
| PFOS (a PFAS)as reported · Treatment plants · 2025 report, page 8 | Not detected | 1 ppt | 4 ppt from 2029 | Not detected |
| Turbidity (cloudiness)highest measured · Treatment plants · 2025 report, page 8 | 0.16 NTU | None set | 1 NTU | Below the legal limit |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper.
What you can do
Nothing here is an emergency notice: if the district has a violation, it must tell customers directly. If you’d like to lower these at your tap, these are the treatments that remove them, and the catalog shows the models certified for each. Ranking is by certified removal; commissions never change the order.
Bacteria and viruses
Found: Total coliform bacteria
What removes it: UV purification (and tell your utility).
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