Drinking water quality · 2024
· Verified
What's in Green Bay, WI tap water
31 contaminants were measured in the Green Bay, WI water system's 2024 annual report. Each is shown below against its federal limit — 2 sit at or above that limit.
- Reporting year
- 2024
- Contaminants measured
- 31
- Over federal limit
- 2
- Approaching the limit
- 1
- Worst contaminant
- Manganese
- Service area
- WI
Where your water comes from · EPA SDWIS
Green Bay, WI's drinking water comes from ground water, drawn from 2 sources.
Source
- BF214
- BF215
Treatment
- BF214
- 4
Distribution
Also buys water from CENTRAL BROWN CO WATER AUTHORITY.
Historical readings · EPA Six-Year Review (2012–2019)
2 contaminants historically over EPA limits in Green Bay, WI
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
RADIUM 226 228 worst: 2013 | 8.61 pCi/L 1.7× above national p90 | 5 pCi/L | '12'13'14'15'16'17'18'19 |
TTHM worst: 2017 | 0.0823 mg/L 1.0× | 0.08 mg/L | '13'14'15'16'17'18'19 |
GROSS ALPHA worst: 2014 | 14.5 pCi/L 97% | 15 pCi/L | '12'13'14'19 |
HAA5 worst: 2019 | 0.0372 mg/L within | 0.06 mg/L | '13'14'15'16'17'18'19 |
FLUORIDE worst: 2013 | 1.3 mg/L within | 4 mg/L | '13'14'17'19 |
THALLIUM worst: 2019 | 0.00055 mg/L within | 0.002 mg/L | '19 |
CHLORINE FREE worst: 2016 | 0.69 mg/L within | 4 mg/L | '16'17'18'19 |
ARSENIC worst: 2019 | 0.0011 mg/L within below national p90 | 0.01 mg/L | '19 |
BARIUM worst: 2014 | 0.17 mg/L within near national p90 | 2 mg/L | '13'14 |
NITRATE worst: 2012 | 0.5 mg/L within | 10 mg/L | '12'13'15'16'17'19 |
NITRATE NITRITE worst: 2014 | 0.35 mg/L within | 10 mg/L | '14'17 |
P DICHLOROBENZENE worst: 2016 | 0.0022 mg/L within | 0.075 mg/L | '13'16 |
URANIUM worst: 2018 | 0.00059 ug/L within below national p90 | 30 ug/L | '13'14'18'19 |
COPPER worst: 2014 | 0.471 mg/L below national p90 | — | '14'17 |
LEAD worst: 2014 | 0.0083 mg/L | — | '14'17 |
DBAA worst: 2013 | 0.00086 mg/L | — | '13'14'15'16'17'18'19 |
DCAA worst: 2013 | 0.0077 mg/L | — | '13'14'15'16'17'18'19 |
MBAA worst: 2016 | 0.00084 mg/L | — | '16'17'18'19 |
TCAA worst: 2013 | 0.0051 mg/L | — | '13'14'15'16'17'18'19 |
BROMODICHLOROMETHANE worst: 2013 | 0.012 mg/L | — | '13'14'15'16'17'18'19 |
CHLOROFORM worst: 2013 | 0.022 mg/L | — | '13'14'15'16'17'18'19 |
DIBROMOCHLOROMETHANE worst: 2013 | 0.0049 mg/L | — | '13'14'15'16'17'18'19 |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ManganeseA naturally occurring metal from soil and rock. | 0.3 mg/LReported levelHal | 0.005 mg/LMCL | At or above the limit |
| NickelA metal from natural deposits and industrial discharge. | 0–1.1 ug/LRangeOf Values Tested | 100 ug/LMCL | Within the limit |
| ZincA naturally occurring metal that can also enter water from corroding pipes. | 0–0.0018 mg/LRangeOf Values Tested | 5 mg/LMCL | Within the limit |
| SodiumA naturally occurring salt component. | 8.3–8.7 mg/LRangeOf Values Tested | None set | Detected — no federal limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| pHA measure of how acidic or basic the water is. | 7.7Reported levelSystem-wide | 6.5MCL | At or above the limit |
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 170 mg/LReported levelSystem-wide | 500 mg/LMCL | Within the limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| BromateA disinfection byproduct formed when bromide-containing water is treated with ozone. | 0–8.8 ug/LRangeOf Values Tested | 10 ug/LMCLG | Approaching the limit |
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFBAPerfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.' | 1.7–1.9 ng/LRangeOf Values Tested | 10 ng/LAction level | Within the limit |
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | 2.2 ng/LReported levelSystem-wide | 20 ng/LAction level | Within the limit |
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 2 ng/LReported levelSystem-wide | 20 ng/LAction level | Within the limit |
| Perfluorononanoic acidPerfluorononanoic acid, a PFAS 'forever chemical.' | 0–0.57 ng/LRangeOf Values Tested | 30 ng/LAction level | Within the limit |
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | 0–0.73 ng/LRangeOf Values Tested | 40 ng/LAction level | Within the limit |
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | 0.96–1.4 ng/LRangeOf Values Tested | 150 ng/LAction level | Within the limit |
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | 0.32–0.57 ng/LRangeOf Values Tested | 450 ng/LAction level | Within the limit |
| Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.' | 0.86–1.5 ng/LRangeOf Values Tested | None set | Detected — no federal limit |
| Perfluoropentanesulfonic acid (PFPeS)Perfluoropentanesulfonic acid, a PFAS 'forever chemical.' | 0–0.55 ng/LRangeOf Values Tested | None set | Detected — no federal limit |
| Perfluoropentanoic acidPerfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.' | 1.4–1.6 ng/LRangeOf Values Tested | None set | Detected — no federal limit |
Inorganic chemicals
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| AtrazineA widely used agricultural herbicide that reaches water through runoff. | 0.0095 ug/LReported levelSystem-wide | 3 ug/LMCLG | Within the limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | 0.4 pCi/LReported levelSystem-wide | 0 pCi/LMCLG | Detected — no federal limit |
People also ask about Green Bay, WI's water
+Is Green Bay, WI tap water safe to drink in 2024?
The 2024 Consumer Confidence Report for the Green Bay, WI water utility lists 2 contaminants at or above the federal limit: Manganese and pH. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in Green Bay, WI tap water?
31 contaminants were measured in Green Bay, WI's 2024 Consumer Confidence Report, spanning pfas ("forever chemicals"), metals, and inorganic chemicals. 27 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in Green Bay, WI tap water?
2 contaminants in Green Bay, WI's 2024 report sit at or above the federal limit: Manganese (60.0× the limit); pH (1.2× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in Green Bay, WI tap water?
The contaminant with the highest measured value relative to its federal limit in the 2024 report is Manganese, at 60.0× the federal threshold. It belongs to the metals family of contaminants.
+Are any contaminants in Green Bay, WI tap water approaching the federal limit?
One contaminant is between 80% and 100% of the federal limit in this report: Bromate. Approaching means measured but not in violation — a margin that can close quickly if conditions change.
+Where does the data on this page come from?
Every value is transcribed from Green Bay, WI's 2024 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Green Bay, WI's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2024 report; a new report will replace it once the utility publishes its next annual update.