Test results show that groundwater near the Madison airport contains levels of PFAS thousands of times higher than the recommended limits.
A legislative committee undermines the Department of Natural Resources' first attempt to regulate the use of PFAS-containing firefighting foam by stripping key language from an administrative rule that implements Act 101.
Wisconsin finalizes its PFAS Action Plan. The plan recommends municipal drinking water testing but explains that statewide testing will require $750,000 in funding.
The Wisconsin Department of Natural Resources explains at a stakeholder meeting that it plans to conduct PFAS testing of 50 municipal water utilities but not the thousands of others that serve the rest of the state.
A coalition of 34 environmental and public health organizations submit a letter to the Wisconsin Department of Natural Resources urging the agency to order public water systems in the state to test for PFAS.
Act 101, legislation that regulates firefighting foam that contains PFAS, goes into effect. The Act gives DNR the authority to promulgate rules to implement and administer the act.
The City of La Crosse conducts testing for PFAS in private drinking water wells near the La Crosse airport.
Governor Evers signs Executive Order #40 to address the issue of PFAS contamination in Wisconsin.
The Wisconsin Department of Health Services recommends groundwater standards for PFOA and PFOS in order to protect human health. The agency recommends an additional 16 groundwater standards for PFAS in November.