Drinking water quality · 2024
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.
- Reporting year
- 2024
- Contaminants measured
- 31
- Over federal limit
- 0
- Approaching the limit
- 1
- 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.
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
- Maximum contaminant level exceededHealth-based15 violations on record · most recent Oct 2005resolved
- Treatment technique violationHealth-based2 violations on record · most recent Oct 2024resolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗
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 |
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 15.3–47.3 ug/LRangeOf Values Tested | None set | Within the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 6.1–7.5 ug/LRangeOf Values Tested | None set | Within the limit |
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | 2.2 ng/LReported levelSystem-wide | None set | Within the limit |
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 2 ng/LReported levelSystem-wide | None set | Within the limit |
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | 0.73 ng/LReported levelSystem-wide | None set | Within the limit |
| Perfluorononanoic acidPerfluorononanoic acid, a PFAS 'forever chemical.' | 0.57 ng/LReported levelSystem-wide | None set | Within the limit |
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | 0.32–0.57 ng/LRangeOf Values Tested | None set | Detected — no federal limit |
| Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.' | 0.86–1.5 ng/LRangeOf Values Tested | None set | Detected — no federal limit |
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | 1.4 ng/LReported levelSystem-wide | None set | Detected — no federal limit |
| Perfluoropentanesulfonic acid (PFPeS)Perfluoropentanesulfonic acid, a PFAS 'forever chemical.' | 0.55 ng/LReported levelSystem-wide | 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 |
| PFBAPerfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.' | 1.7–1.9 ng/LRangeOf Values Tested | None set | Detected — no federal limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0.5 mg/L90th percentileAt the tap | 1.3 mg/LMCLG | Within the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 2.5 ug/L90th percentileAt the tap | 0 ug/LMCLG | Within the limit |
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 1.1 ug/LReported levelSystem-wide | None set | Within the limit |
| BariumA metal from erosion of natural deposits and industrial discharge. | 0.02 mg/LReported levelSystem-wide | 2 mg/LMCLG | Within the limit |
| ManganeseA naturally occurring metal from soil and rock. | 0.3 mg/LReported levelHal | None set | Detected — no federal limit |
| NickelA metal from natural deposits and industrial discharge. | 1.1 ug/LReported levelSystem-wide | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 8.3–8.7 mg/LRangeOf Values Tested | None set | Detected — no federal limit |
| ZincA naturally occurring metal that can also enter water from corroding pipes. | 0.0018 mg/LReported levelSystem-wide | None set | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.75–0.82 mg/LRangeOf Values Tested | 4 mg/LMCLG | Within the limit |
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 0.26–0.32 mg/LRangeOf Values Tested | 10 mg/LMCLG | Within the limit |
| ChlorideA naturally occurring salt compound. | 16 mg/LReported levelSystem-wide | None set | Detected — no federal limit |
| SulfateA naturally occurring mineral from rock and soil. | 22 mg/LReported levelSystem-wide | None set | Detected — no federal 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 | Within the limit |
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 0.8 pCi/LReported levelSystem-wide | 0 pCi/LMCLG | Within the limit |
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 0.4 ug/LReported levelSystem-wide | 0 ug/LMCLG | Within the limit |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| AtrazineA widely used agricultural herbicide that reaches water through runoff. | 0.0095 ug/LReported levelSystem-wide | None set | Within the limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| pHA measure of how acidic or basic the water is. | 7.7Reported levelSystem-wide | None set | Detected — no federal limit |
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 170 mg/LReported levelSystem-wide | None set | Detected — no federal limit |
People also ask about Green Bay, WI's water
+Is Green Bay, WI tap water safe to drink in 2024?
Every one of the 31 contaminants measured in Green Bay, WI's 2024 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of 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. 9 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+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.