- EPA's UCMR 5 testing looked for 30 contaminants here and found none.
- Lead, 90th percentile: 2.5 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jun 1, 2023–Sep 30, 2023). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
Public EPA test results
Can you drink Green Bay tap water? What EPA records show
EPA WI4050356 · serves Green Bay, WI · about 107,369 people (EPA SDWIS)
This report shows EPA's federal records for this water system: UCMR 5 testing, lead testing and violations. It isn't a test of the water at your tap, and it has no Water Score.
Public EPA test results
Green Bay Waterworks (EPA WI4050356)
EPA data as of October 14, 2026. For Green Bay's main utility, Green Bay Waterworks: We found no health-based violations in EPA's records for this system (WI4050356) since July 1, 2021, as of October 14, 2026. PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
What EPA records show for Green Bay Waterworks, as of October 14, 2026
We found no health-based violations in EPA's records for this system (WI4050356) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Green Bay Waterworks (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 2.5 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jun 1, 2023–Sep 30, 2023). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found none.
PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does Green Bay Waterworks use chloramine?
We didn't find chloramine in Green Bay Waterworks's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.
What EPA records show for this system
Reported results in EPA records (data as of Oct 14–15, 2026)
Source: EPA SDWIS (ECHO SDWA bulk download), data as of Oct 14, 2026
Source: EPA UCMR 5 occurrence data, data as of Oct 15, 2026
These are EPA's public records for this water system, shown as of October 14, 2026. If you represent this utility, or think a record here is wrong, tell us: Report an error. If the error is in EPA's own records, your state drinking water program can correct it there, and this page updates at our next data refresh.
Sources
- EPA ECHO detailed facility report: Green Bay Waterworks (WI4050356), July to September 2026 extract
- EPA SDWIS (ECHO SDWA bulk download), July to September 2026 extract
- EPA UCMR 5 occurrence data, samples through June 2026
Which utility serves you?
- No boundary data
Green Bay Waterworks
- Lead results: in EPA records
- PFAS results: in EPA records
- Violations record: not in EPA records
Howard Waterworks
- Lead results: in EPA records
- PFAS results: in EPA records
- Violations record: in EPA records
Ashwaubenon Waterworks
- Lead results: in EPA records
- PFAS results: in EPA records
- Violations record: not in EPA records
Bellevue Waterworks
- Lead results: in EPA records
- PFAS results: in EPA records
- Violations record: not in EPA records
Allouez Waterworks
- Lead results: in EPA records
- PFAS results: in EPA records
- Violations record: in EPA records
Approximate service area from EPA's Community Water System Service Area Boundaries; some boundaries are modeled estimates. Your water bill names your utility.
Solid: EPA has this type of record for the system. Grey: it does not.
Dashed outline: boundary is a modeled estimate
No boundary shown: EPA's data has no service-area boundary for the system, or the boundary's source doesn't allow us to show it.
Questions people ask
Is Green Bay tap water safe to drink?
We don't give a safe or unsafe verdict. Here is what the public data shows: EPA records for Green Bay's main utility, Green Bay Waterworks, as of October 14, 2026. We found no health-based violations in EPA's records for this system (WI4050356) since July 1, 2021, as of October 14, 2026. PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing. A guideline and a legal limit are different things, and this is public data, not a test of your tap.
Which utility supplies water in Green Bay?
Green Bay Waterworks is the main utility for Green Bay in EPA's records (EPA WI4050356), serving about 107,369 people (EPA SDWIS). Your water bill names your utility.
Does Green Bay tap water contain PFAS?
PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing. This is public data, not a test of your tap.
How recent is this data?
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026. Data may be one to three years old and may not reflect the water at your tap. If you want your own tap tested, use a state-certified laboratory.
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