Green Bay
WI

Is Green Bay, WI Tap Water Safe to Drink?

Green Bay, WI tap water currently meets EPA health guidelines across all monitored ZIP codes in this dataset. Contaminants including lithium have been detected at or below guideline thresholds.

3Water systems
5ZIP codes
0%ZIPs above EPA guideline
Metro areaGreen Bay, WI
Latest data2025-09-25

Where Does Green Bay Get Its Water?

Water in Green Bay, WI is provided by 3 public water systems: GREEN BAY WATERWORKS, BELLEVUE WATERWORKS and HOWARD WATERWORKS.

How Is Green Bay Tap Water Treated?

Treated water is disinfected using chloramines and free chlorine and ozone. Treatment includes conventional treatment (coagulation, flocculation, and filtration) and membrane filtration.

What's in Green Bay Tap Water?

The following contaminants were detected most frequently in Green Bay public water systems. All detected levels fall at or below EPA health guidelines in this dataset.

ContaminantPeak detectedEPA guidelineZIPs detectedStatus
lithium 9 µg/L — 0 ZIPs Within guideline
PFTrDA 0.007 µg/L 0.007 µg/L 1 ZIP Within guideline
11Cl-PF3OUdS 0.005 µg/L — 0 ZIPs Within guideline
HFPO-DA 0.005 µg/L — 0 ZIPs Within guideline
PFBA 0.005 µg/L — 0 ZIPs Within guideline

Health Risk Profile for Green Bay

Current EPA monitoring data for Green Bay shows contaminant levels within guideline thresholds across all ZIP codes in this dataset. As with all public water systems, sensitive populations may choose to use a certified filter for additional peace of mind.

Best Broad-Spectrum Filters for This Water Profile

This city profile includes PFAS detections, chlorine disinfection, and other dissolved contaminants. Reverse osmosis (RO) systems certified under NSF/ANSI 58 provide broad reduction coverage; for PFAS specifically, confirm NSF/ANSI P473 or equivalent PFAS reduction certification.

Waterdrop G3P600 Reverse Osmosis System
Under-sink RO system

8-stage tankless RO system certified to NSF/ANSI 58, reduces 1,000+ contaminants including PFAS, lead, arsenic, fluoride, and nitrates.

See recommendations matched to your exact address: choose your ZIP code below.

Frequently Asked Questions about Green Bay Tap Water

Is Green Bay tap water safe to drink?

Green Bay tap water currently meets EPA health guidelines across all monitored ZIP codes in this dataset. Sensitive populations may still choose to use a certified filter as a precaution.

What contaminants are in Green Bay tap water?

The most commonly detected contaminants in Green Bay water systems include: lithium, PFTrDA, 11Cl-PF3OUdS. See the ZIP-level reports for exact measurements and EPA guideline comparisons.

Where does Green Bay get its drinking water?

Green Bay receives water from 3 public water systems, including GREEN BAY WATERWORKS.

Do I need a water filter in Green Bay?

Current data does not show guideline exceedances in Green Bay. A certified filter can still reduce trace contaminants and improve taste for households that prefer filtered water.

How often is Green Bay tap water tested?

Public water systems in Green Bay are required by the EPA to test for regulated contaminants on schedules ranging from daily (for microbials and disinfectants) to annual or triennial (for many chemical contaminants). Results are published in annual Consumer Confidence Reports (CCRs). The data on this page reflects the most recent available EPA monitoring results, with the latest sample date of 2025-09-25.

Tap water reports by ZIP in Green Bay

Water utilities serving Green Bay, WI

Service area boundaries are approximate and based on state filings or modeled estimates. Contact your utility to confirm exact service at a specific address.

Modeled boundaries are shown with a dashed outline.

Also covers / overlaps with