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FOR IMMEDIATE RELEASE: Sept. 4, 2025
Contact: DNR Office of Communications
DNRP...@wisconsin.gov
DNR And DHS Issue New PFAS-Based Consumption Advisory For Ducks Harvested On Green Bay
 The Wisconsin DNR and DHS have issued new consumption advice for mallards and wood ducks harvested on Green Bay. / Photo Credit: Wisconsin DNR
MADISON, Wis. – The Wisconsin Department of Natural Resources (DNR) and the Department of Health Services (DHS) today announced a new consumption advisory for mallards and wood ducks harvested on Green Bay due to the contamination of per- and polyfluoroalkyl substances (PFAS).
Based on PFAS testing results in the region, the DNR and DHS have issued consumption advisories for two different areas of the bay.
- Lower Green Bay from Longtail Point across to Point au Sable and south to the mouth of the Fox River
- Green Bay from the city of Marinette across to Sturgeon Bay and south to Longtail Point
- Mallards: 1 meal per month
- Wood ducks: 1 meal per week
This advisory is in effect immediately, and hunters should be aware of this for the fall hunting season.
Waterfowl were first collected from Green Bay in 2022 to evaluate the existing polychlorinated biphenyl (PCB) consumption advisory in lower Green Bay. An additional assessment of PFAS concentrations in breast muscle tissue was included in this effort. In 2023 and 2024, additional duck breast muscle samples were collected. All testing occurred between the months of July and August, increasing the likelihood that the birds were representative of local breeding populations.
Results from these efforts indicate elevated levels of perfluorooctane sulfonate (PFOS), a type of PFAS, in the breast muscle of the sampled ducks. The results also indicate that both adult and juvenile ducks in lower Green Bay have higher concentrations of PFOS than in the northern portion of the bay.
Based on these results, the DNR worked with DHS to develop new PFAS-based consumption guidelines for ducks.
Following wildlife consumption advisories will help prevent the consumption of PFAS-contaminated tissue, which can cause the chemicals to accumulate in the body. The DNR's Consumption Advisories and PFAS webpage has a complete list of up-to-date PFAS-based consumption advisories in Wisconsin.
Information About PFAS
PFAS are a group of human-made chemicals that have been used for decades in various products, such as non-stick cookware, fast food wrappers, stain-resistant sprays and certain types of firefighting foams. These contaminants have made their way into the environment in a variety of ways, including spills of PFAS-containing materials, discharges of PFAS-containing wastewater to treatment plants and the use of certain types of firefighting foams.
Health risks may increase when fish and wildlife with high levels of PFAS are consumed. These can include increased cholesterol levels, decreased immune response and decreased fertility in women, among other health effects. More information is available on the DHS website.
Additional information on the effects of PFAS can be found on the DNR's website.
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