Tap Water Results

Is Green Bay, WI tap water safe?

Data: U.S. EPA · How we read the data · How we check it

Summary

No federal limits exceeded in EPA data for Green Bay Waterworks.

6 public water systems serve parts of Green Bay. The largest, Green Bay Waterworks, serves 107,369 people. Your water bill names your system.

Largest system

Green Bay Waterworks

107,369 people · Surface water · EPA ID WI4050356

PFASHighest averageLimitStatus
PFOA
Not detected
–4 pptNot detected
PFOS
Not detected
–4 pptNot detected
PFHxS
Not detected
–10 pptNot detected
PFNA
Not detected
–10 pptNot detected
HFPO-DA (GenX)
Not detected
–10 pptNot detected

ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.

Lead: 2.5 ppb at the 90th percentile (Sep 2023, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0

Full Green Bay Waterworks results

Across Wisconsin, 18 of 196 water systems EPA tested had PFAS above a 2024 federal limit, and 4 systems were above the lead action level in results from the last five years. Wisconsin results.

Green Bay homes and lead pipes

65%
of homes built before 1980 (Wisconsin 57%, US 50%)
20%
built before 1950 (Wisconsin 23%)
42%
of households rent (Wisconsin 32%)

Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.

Housing: Census American Community Survey 2020–2024 5-year estimates for Green Bay city (tables B25034, B25003). Estimates for small places have a margin of error.

Other water systems serving Green Bay

  • Howard Waterworks
    21,133 people · Purchased surface water · Wisconsin · lists this city
    No PFAS above limitsAlso: 2 health-based violations since 2016
  • Ashwaubenon Waterworks
    17,730 people · Purchased surface water · Wisconsin · lists this city
    No PFAS above limits
  • Bellevue Waterworks
    16,715 people · Purchased surface water · Wisconsin · lists this city
    No PFAS above limits
  • Allouez Waterworks
    13,923 people · Purchased surface water · Wisconsin · lists this city
    No PFAS above limitsAlso: 1 health-based violation since 2016
  • Scott Water Utility District
    1,875 people · Purchased surface water · Wisconsin · reported ZIPs here
    Not in EPA's PFAS sample

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
De Pere 8 mi
De Pere Waterworks Service Area 1
De Pere Waterworks Service Area 1None above limits0.66 ppb
Appleton 26 mi
Appleton Waterworks
Appleton WaterworksNone above limits1.3 ppb
Manitowoc 33 mi
Manitowoc Waterworks
Manitowoc WaterworksNone above limits7.7 ppb
Neenah 34 mi
Neenah Waterworks
Neenah WaterworksNone above limits10 ppb
Oshkosh 45 mi
Oshkosh Waterworks
Oshkosh WaterworksNone above limits6.1 ppb
Sheboygan 55 mi
Sheboygan Water Utilities
Sheboygan Water UtilitiesNone above limits2.2 ppb
Green Bay ZIP codes (5)
  • 54301
  • 54302
  • 54303
  • 54304
  • 54311

Questions

Is Green Bay tap water safe to drink?

Green Bay Waterworks has had no health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.

Who supplies water in Green Bay, WI?

6 public water systems serve parts of Green Bay. The largest is Green Bay Waterworks (107,369 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Green Bay tap water have PFAS?

None detected above EPA's reporting limits. Green Bay Waterworks had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.

Do Green Bay homes have lead pipes?

Census estimates put 65% of Green Bay homes as built before 1980 (Wisconsin: 57%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Green Bay Waterworks's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.