Green Bay Waterworks water quality
Green Bay, WI · serves 107,369 people (39,766 connections) · Surface water · Local government · EPA ID WI4050356
Data: U.S. EPA · How we read the data · How we check it
Summary
No federal limits exceeded in EPA data.
- PFAS
- Not detectedNone of 29 PFAS found above EPA's reporting limits in 4 samples (2023–2025).
- Lead
- Below action level2.5 ppb (parts per billion) at the 90th percentile: 9 in 10 homes sampled were at or below it. Action level 15 ppb, falling to 10 ppb in Nov 2027. Monitoring period ending Sep 2023. Your home's pipes can make yours higher.
- Violations
- None health-basedNo health-based violations since 2016.
- Built before 1986, or not sure what your service line is made of? Check your service line and test your tap. Utility data can't show your pipes.
- Tested your own tap? Compare your result with these numbers. Moving? Compare this system with another.
- Read Green Bay Waterworks's annual water quality report (Consumer Confidence Report). It lists every regulated contaminant tested and is usually on the utility's website or mailed with your bill. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 1 entry point tested Jan 2024 to Oct 2024. "Average" is the highest entry-point average (non-detects counted as zero), the way EPA compares UCMR 5 results to the limits. ppt = parts per trillion. These results do not determine compliance.
| Contaminant | Highest average |
|---|---|
| PFOA Not detected Limit 4 ppt | – |
| PFOS Not detected Limit 4 ppt | – |
| PFHxS Not detected Limit 10 ppt | – |
| PFNA Not detected Limit 10 ppt | – |
| HFPO-DA (GenX) Not detected Limit 10 ppt | – |
| Hazard Index (a combined score for PFHxS, PFNA, GenX and PFBS, where above 1 is over the limit) Not detected Limit 1 | – |
| PFBS Not detected Guideline 2,000 ppt | – |
| PFBA Not detected Guideline 6,000 ppt | – |
| PFHxA Not detected Guideline 3,000 ppt | – |
29 PFAS tested, 0 detected at least once. "Not detected" means below EPA's reporting limit (about 2 to 20 ppt depending on the chemical), not proven zero. PFAS not listed were not detected. The limits for PFHxS, PFNA, GenX and the Hazard Index were proposed for rescission in May 2026. That proposal is not final. Systems have until 2029 to meet the limits.
Lithium
Not detected in 4 samples (reporting limit 9 ppb). About lithium.
Lead and copper
Latest 90th percentile: 2.5 ppb lead (Jun 2023 – Sep 2023). Below action level
Highest since 2016: 18 ppb (Dec 2019).
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jun 2023 – Sep 2023 | 2.5 ppb |
| Jan 2021 – Jun 2021 | 3.3 ppb |
| Jul 2020 – Dec 2020 | 2.6 ppb |
Earlier results (9)
| Jan 2020 – Jun 2020 | 9.3 ppb |
| Jul 2019 – Dec 2019 | 18 ppb |
| Jan 2019 – Jun 2019 | 11 ppb |
| Jul 2018 – Dec 2018 | 11 ppb |
| Jan 2018 – Jun 2018 | 12 ppb |
| Jul 2017 – Dec 2017 | 16 ppb |
| Jan 2017 – Jun 2017 | 12 ppb |
| Jul 2016 – Dec 2016 | 18 ppb |
| Jan 2016 – Jun 2016 | 15 ppb |
Lead comes from pipes and fixtures, not the source water, so it varies home to home. The 90th percentile means 9 in 10 sampled homes were at or below it. More on lead.
Violations
Health-based violations mean a contaminant exceeded a limit or a required treatment step was missed. Monitoring and reporting violations mean required tests or reports were late or missing, so the water's quality during that time is unknown. The total includes every violation in EPA's records, most of them paperwork.
Earlier EPA testing (2013–2020)
| Contaminant | Highest | Guideline |
|---|---|---|
| 1,4-Dioxane | 0.083 ppb | 0.35 ppb |
| Vanadium | 0.27 ppb | 21 ppb |
| Chlorate | 93.3 ppb | 210 ppb |
| Chromium-6 | 0.24 ppb | – |
| Molybdenum | 1.02 ppb | 40 ppb |
| Strontium | 0.13 ppm | 1.5 ppm |
Where it serves
ZIP codes the system reported serving: 54301, 54302, 54303, 54304, 54305, 54311, 54313
Nearby utilities
- Appleton Waterworks Menasha · 30 mi
- Sturgeon Bay Waterworks Sturgeon Bay · 37 mi · PFAS above limit
- Oshkosh Waterworks Oshkosh · 45 mi
- Marshfield Utilities Marshfield · 48 mi · PFAS above limit
- Waupaca Waterworks Waupaca · 52 mi · PFAS above limit
- Kewaskum Waterworks Kewaskum · 71 mi · PFAS above limit
Questions
Is Green Bay Waterworks water safe to drink?
Green Bay Waterworks has no health-based violations since 2016. EPA testing found no PFAS above the federal limits. Federal data can't tell you about your own pipes: lead comes from service lines and plumbing, so test your tap if your home was built before 1986. For the official word, read the utility's annual Consumer Confidence Report.
Does Green Bay Waterworks water have PFAS?
EPA tested Green Bay Waterworks for 29 PFAS between Jan 2024 and Oct 2024 and none were detected above the reporting limits (about 2 to 20 ppt depending on the chemical).
What is the lead level in Green Bay Waterworks water?
The most recent 90th-percentile lead result for Green Bay Waterworks is 2.5 ppb, for the period ending Sep 2023. The federal action level is 15 ppb, falling to 10 ppb in November 2027. The 90th percentile means 9 in 10 homes sampled were at or below this number. Individual homes can be higher.
Check these numbers yourself
Every figure on this page comes from public EPA records. You don't have to take our word for it:
- EPA's own report for WI4050356: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID WI4050356).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask Green Bay Waterworks, or see EPA's guide to finding it.
Found something that doesn't match? Tell us and we'll check it against EPA's records. How we check our data.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.