Green Bay Area Ducks Contaminated with ‘Forever Chemicals’
Warnings by state agencies to limit consumption given high levels of PFAS.

Duck. Photo by Basile Morin, (CC BY-SA 4.0), via Wikimedia Commons
State agencies are warning Wisconsinites to limit the amount of ducks that they eat, or to avoid certain birds entirely, due to PFAS contamination. Waterfowl harvested around Green Bay were shown to have high levels of the man-made “forever chemicals,” which persist in the environment forever and have been linked to several chronic diseases including cancers.
The Department of Natural Resources (DNR) and Department of Health Services (DHS) are advising people not to eat mallards from around lower Green Bay from Longtail Point to Point au Sable, and south of the mouth of the Fox River. Additionally, mallards and wood ducks living around Green Bay from the city of Marinette across to Sturgeon Bay should not be consumed frequently — no more more often than once per month for mallards and only one meal per week for wood ducks.
Back in 2022 levels of polychlorinated biphenyls (PCBs), another man-made chemical, in waterfowl led to similar advisories in lower Green Bay. Further assessments found concentrations of PFAS in breast muscle tissue, according to a DNR press release. In 2023 and 2024, more samples were taken from ducks, with all samples taken during July and August when the birds were most likely to represent local breeding populations. Those efforts revealed elevated levels of perfluorooctane sulfonate (PFOS), which is a type of PFAS, in the breast muscles of the birds. The inquiry suggested that both adult and juvenile ducks in lower Green Bay have higher concentrations of PFOS than in the northern portion of the bay.
PFAS chemicals were first developed as part of U.S. government nuclear and atomic weapons research during the Manhattan Project. After the project ended private companies, particularly DuPont, began researching the compounds for commercial use. Over the subsequent decades, PFAS was used in products including non-stick Teflon pans, fast food wrappers, and firefighting foam. The chemicals do not degrade in the environment, nor within the body, and have been linked to cancers and other chronic diseases.
The DNR tracks PFAS consumption advisories spanning multiple species including deer, fish and waterfowl. On Sept. 4, deer and fish advisories for PFAS were issued for the Town of Stella and surrounding waterbodies in Oneida County. All fish in the Moen Lake Chain were included in a “do not eat” advisory due to PFAS contamination, and a similar warning was distributed against the consumption of deer liver near the Town of Stella.
Green Bay area ducks contaminated with PFAS, consumption limited was originally published by the Wisconsin Examiner.
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More about the PFAS Problem
- Green Bay Area Ducks Contaminated with ‘Forever Chemicals’ - Isiah Holmes - Sep 8th, 2025
- DNR and DHS Issue New PFAS-based Consumption Advisory for Ducks Harvested on Green Bay - Wisconsin Department of Natural Resources - Sep 4th, 2025
- DNR and DHS Issue New PFAS-based Consumption Advisories for Fish and Deer Near town of Stella and Surrounding Waterbodies in Oneida County - Wisconsin Department of Natural Resources - Sep 4th, 2025
- Groundwater Coordinating Council Releases 2025 Report to the Legislature - Wisconsin Department of Natural Resources - Sep 2nd, 2025
- Environmental Groups, Community Advocates Push for PFAS Deal - Henry Redman - Jul 14th, 2025
- Environmental Advocates Hail Wisconsin Supreme Court Decision in Evers v Marklein - Midwest Environmental Advocates - Jul 8th, 2025
- Wisconsin Supreme Court Backs State Regulators of PFAS Pollution - Danielle Kaeding and Rich Kremer - Jun 24th, 2025
- Gov. Evers Releases Statement on Wisconsin Supreme Court Decision in WMC Inc v. DNR - Gov. Tony Evers - Jun 24th, 2025
- Rep. Shelia Stubbs Elected Great Lakes-St. Lawrence Legislative Caucus Vice Chair of the Task Force on Emerging Contaminants - State Rep. Shelia Stubbs - Jun 16th, 2025
- Legislature’s Budget Committee Unanimously Boosts Clean Water Funding By $732 Million - Danielle Kaeding - Jun 6th, 2025
Read more about PFAS Problem here