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PFAS (per- and polyfluoroalkyl substances) are a large group of synthetic chemicals used for decades in products such as nonstick cookware, stain-resistant fabrics, food packaging, and firefighting foam. Because they break down extremely slowly, they can accumulate in the environment and in the human body over time.
What the EPA’s 2024 PFAS Rule Changed
In April 2024, the U.S. Environmental Protection Agency (EPA) finalized the first federal drinking water standards for several PFAS compounds. The rule established a maximum contaminant level (MCL) of 4 parts per trillion (ppt) for both PFOA and PFOS, two of the most extensively studied PFAS chemicals. Public water systems are now required to monitor for these contaminants and take action if levels exceed the federal limits.
Long-term exposure to certain PFAS has been associated in scientific studies with higher cholesterol levels, reduced immune response, liver effects, developmental problems in children, thyroid disorders, and an increased risk of some cancers. Although research is ongoing, many health agencies recommend minimizing unnecessary exposure whenever possible.
If you're curious about your local water quality, one useful resource is the Environmental Working Group (EWG) Tap Water Database, which allows users to search by ZIP code to review testing results from public water systems. The database compiles available utility data and can help consumers better understand what contaminants have been detected in their community, although it is not a government regulatory source.
For households seeking additional protection, certain water filtration technologies have been shown to reduce PFAS levels effectively. Reverse osmosis (RO) systems can remove more than 95% of many PFAS compounds when properly installed and maintained. Granular activated carbon (GAC) filters are also effective, with studies showing average reductions of around 70% or more, although performance varies depending on the specific PFAS, filter design, and maintenance schedule.
When shopping for a home filtration system, experts recommend looking for products that have been independently tested or certified for PFAS reduction. Reverse osmosis systems certified under NSF/ANSI Standard 58 are among the most widely recognized options for RO technology. Brands such as Aquasana and Clearly Filtered also offer products that have undergone third-party performance testing for PFAS reduction, but consumers should always verify the specific certification or test results for the exact model they plan to purchase.
