We read 18 results from Green Bay Waterworks’s 2025 water quality report. No results over a legal limit; 6 above a health goal or guideline.
Serves about 107,369 people · Water system ID WI4050356 · 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 |
|---|---|---|---|---|
| Arsenichighest measured · range ND to 1.1 · sampled 2022 · Entry point · 2025 report, page 3 | 1.1 ppb | 0.004 ppb | 10 ppb | Above the health goal275x the health goal |
| Bromateas reported · range ND to 6.7 · Entry point · 2025 report, page 4 | 2.5 ppb | 0.1 ppb | 10 ppb | Above the health goal25x the health goal |
| Copper90th percentile of 50 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 3 | 0.5 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.7x the health goal |
| Lead90th percentile of 50 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 3 | 2.5 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal13x the health goal |
| PFOA (a PFAS)highest measured · range 1.6 to 2.2 · Entry point · 2025 report, page 5 | 2.2 ppt | 0.007 ppt | 70 ppt (Wisconsin) now; 4 ppt from 2029 | Above the health goal314x the health goal |
| PFOS (a PFAS)highest measured · range 1.6 to 2.4 · Entry point · 2025 report, page 6 | 2.4 ppt | 1 ppt | 70 ppt (Wisconsin) now; 4 ppt from 2029 | Above the health goal2.4x the health goal |
| Atrazinesingle sample · Entry point · 2025 report, page 4 | 0.01 ppb | 0.15 ppb | 3 ppb | Below the health goal |
| Bariumas reported · Entry point · 2025 report, page 3 | 0.02 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorideas reported · range 15 to 16 · Entry point · 2025 report, page 4 | 16 ppm | — | 250 ppm guideline | Within the guideline |
| Disinfection byproducts (HAA5)highest running annual average · range 6.6 to 14 · Site D9 · 2025 report, page 4 | 9.2 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 18.6 to 48.6 · Site D9 · 2025 report, page 4 | 28 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideas reported · range 0.63 to 0.79 · Entry point · 2025 report, page 3 | 0.72 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)as reported · range 0.18 to 0.29 · Entry point · 2025 report, page 3 | 0.23 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFHxS (a PFAS)highest measured · range ND to 0.75 · Entry point · 2025 report, page 5 | 0.75 ppt | None set | 10 ppt from 2029 | Below the legal limit |
| Sulfateas reported · range 20 to 21 · Entry point · 2025 report, page 4 | 21 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidssingle sample · Entry point · 2025 report, page 5 | 150 ppm | — | 500 ppm guideline | Within the guideline |
| Turbidity (cloudiness)highest measured · Entry point · 2025 report, page 3 | 0.11 NTU | None set | 1 NTU | Below the legal limit |
| Sodiumas reported · range 8.6 to 9.1 · Entry point · 2025 report, page 4 | 8.9 ppm | None set | None | No health 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.
Lead
Found: Copper, Lead
What removes it: Reverse osmosis or Certified carbon block or RO.
PFAS ("forever chemicals")
Found: PFOA (a PFAS), PFOS (a PFAS)
What removes it: Reverse osmosis.
More districts: Wisconsin water quality · All states · Something look wrong? Tell us