Green Bay

Green Bay, WI receives a water quality score of 51/100 (Grade D) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 4 public water systems serving the area.

Green Bay's water quality score is below the national average, indicating a history of EPA violations or elevated contaminant levels. Residents are encouraged to check their specific water system report and consider additional filtration.

Green Bay's score of 51 is 34 points below the Wisconsin state average of 85, and below the nationwide average of roughly 78/100 across all U.S. states.

For households in Green Bay, Wisconsin, a mid-size city situated in the Upper Midwest near freshwater lakes, the quality of the municipal tap water presents notable concerns that fall well below standard expectations. Because the surrounding region is characterized by agricultural and dairy land, the local water systems must manage inputs from these surrounding environments. For prospective homebuyers or current residents, this subpar performance indicates that relying on the untreated tap water may not be ideal, making household filtration a sensible consideration.

Water quality data is sourced from the U.S. EPA SDWIS database and updated quarterly. Learn about our scoring methodology → Read our Wisconsin water quality rankings report →