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MADISON, Wis. (AP) — The Wisconsin Supreme Court delivered a victory for environmentalists on Tuesday in the fight over “forever chemicals” known as PFAS, issuing a ruling that advocates said will hold polluters accountable.

The liberal-controlled court ruled that state regulators can force landowners to clean up emerging pollutants such as PFAS before they are officially designated as hazardous substances.

The 5-2 ruling is a defeat for the state’s powerful group representing businesses and manufacturers, which had argued the state couldn’t enforce regulations on substances before they were officially designated as hazardous.

It is the latest development in a yearslong battle in Wisconsin and nationally involving regulators, environmentalists, politicians and businesses over how to deal with PFAS contamination.

The PFAS problem

Cities large and small across Wisconsin, from Madison to Marinette and La Crosse to Wausau, are grappling with PFAS contamination.

PFAS, or perfluoroalkyl and polyfluoroalkyl substances, are a group of chemicals that have been around for decades and have now spread into the nation’s air, water and soil.

The chemicals helped eggs slide across nonstick frying pans, ensured that firefighting foam suffocates flames and helped clothes withstand the rain and keep people dry.

They resist breaking down, however, which means they stay around in the environment and have a hard time breaking down in the body. There is a wide range of health harms now associated with exposure to certain PFAS, including low birth weight, cancer and liver disease.

The Wisconsin Supreme Court ruled in a case brought by the state’s largest business group, Wisconsin Manufacturers & Commerce, which sued the DNR in 2021 on behalf of Leather Rich, a dry cleaning business in Oconomowoc.

Leather Rich became aware of PFAS contamination in 2018 and was working on cleaning it up when the DNR posted a message online in 2019 saying it now considered PFAS chemicals a hazardous substance. The agency ordered the dry cleaner to test its groundwater for PFAS but didn’t tell the business which compounds it needed to test for or what levels would be considered dangerous.

Leather Rich argued the DNR can’t force businesses to test and clean up contamination from emerging pollutants like PFAS without first designating them as hazardous substances. That process can take years and requires approval from the Legislature. All that time, polluters could harm the environment and put people’s health and safety at risk with no obligation to begin cleanup, the DNR argued.

A Waukesha County judge and the state appeals court sided with Leather Rich.

The DNR appealed, saying the lower court’s ruling would neuter the state’s “spills law,” which was designed to confront pollution.

That law, enacted about 50 years ago, requires anyone who causes, possesses or controls a hazardous substance that’s been released into the environment to clean it up.

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