Is Green Bay tap water safe to drink?

Yes but with caveats

Green Bay's water meets EPA minimum standards but has some concerns. Filtration is recommended for sensitive individuals.

79/100
Purity Score
3
Issues Found
7.8 GPG
Hardness
Not detected
PFAS

3 Issues Detected in Green Bay

Moderately Hard Water (7.8 GPG)

Hardness above 7 GPG can cause minor scale buildup.

Hardness data for Green Bay

Moderate Chlorine Level

Chlorine within EPA limits but may affect taste.

Chlorine info for Green Bay

Arsenic Approaching Limit (0.2 mg/L)

EPA limit is 0.010 mg/L.

Arsenic info for Green Bay
Wisconsin

543,015,430,254,303 · Lake Michigan

Green Bay, WI Water Quality Report

Moderate Risk Updated March 2026 107,395 residents
See Best Filters for Green Bay
79
Purity Score

Contaminant Levels

PFAS
ND
Lead
4.5 ppb
Nitrate
0.5 mg/L
Arsenic
0.2 mg/L
Hardness
7.8 gpg

Health Insights

  • 1
    At 7.8 GPG, Green Bay's water qualifies as moderately hard. This can cause limescale in pipes and shorten appliance lifespan.
  • 2
    Chlorine levels may affect the taste of Green Bay's tap water. A carbon filter improves flavor.

Score

79 /100
Good
"Good" threshold (70)

Green Bay tap water is sourced from Lake Michigan and treated by Green Bay Water Utility. Water hardness is hard at 7.8 GPG which may cause scale buildup. Overall purity score: 79/100 (Good). Updated for 2026.

Fix Your Water

Best filters matched to Green Bay's 3 issues.

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Green Bay Water FAQ

Is Green Bay WI tap water safe to drink in 2026?
Green Bay tap water meets EPA federal drinking water standards and scores 79/100 (Good) on PurityMap for 2026. For most healthy adults the water is considered safe but point-of-use filtration adds an important layer of protection.
Does Green Bay WI use chlorine or chloramine for disinfection?
Green Bay uses chloramine as the primary disinfectant with a residual level of 1.5 ppm. Chloramine is harder to remove than free chlorine and requires a catalytic carbon or reverse osmosis filter. Standard Brita-style pitchers will NOT remove chloramine.
How hard is Green Bay WI water and what is the TDS level?
Green Bay water hardness is 7.8 grains per gallon (hard) with a TDS of 200 ppm (fair). This level causes noticeable scale buildup in water heaters kettles and dishwashers. A water softener is recommended to protect plumbing and reduce soap usage.
Has PFAS been found in Green Bay WI drinking water?
Based on available EPA UCMR5 monitoring data as of 2026 PFAS have not been detected above EPA advisory levels in Green Bay drinking water.
What is the best water filter for Green Bay?
Based on Green Bay's water profile, we recommend the AFWFilters 5600sxt 48000 Grain Softener. Green Bay has elevated chlorine residuals. An under-sink carbon filter removes chlorine and disinfection byproducts at the tap.

Nearby Reports

MadisonWisconsin — 58/100JanesvilleWisconsin — 73/100KenoshaWisconsin — 79/100RacineWisconsin — 79/100AppletonWisconsin — 79/100OshkoshWisconsin — 79/100

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Data Sources

  • EPA SDWIS
  • EWG Tap Water Database
  • Green Bay Water Utility CCR
  • USGS monitoring data

PurityMap compiles public data. Updated March 2026.

© 2026 PurityMap. For informational purposes only.

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