What Is PFAS ("Forever Chemicals")?
In plain English: PFAS are a large group of human-made "forever chemicals" that resist water, oil, and stains and barely break down. They can turn up in some cleaning and stain-resistant products.
Also listed as: per- and polyfluoroalkyl substances, forever chemicals, PFOA, PFOS
The honest science
In short: PFAS are persistent “forever chemicals” that resist water, oil and stains, and while most everyday cleaners don't contain them, they can turn up in stain- and water-resistant treatments and rarely appear on the label. 13 Our full guide below covers how to check what you already own and how to avoid them in plain-English detail.
Where you'll find it
- stain- and water-resistant treatments
- some detergents
- floor and surface finishes
- certain maintenance products
The safer-swap angle: PFAS are rarely on a label, so the practical safeguard is choosing brands that publicly verify their products are PFAS-free rather than trying to spot them yourself.
→ Read the full deep-dive guide on PFAS ("Forever Chemicals")
Frequently asked questions
Why are PFAS called forever chemicals?
Because they're built around very stable carbon-fluorine bonds that resist breaking down, so they can persist in the environment and the body for a very long time.
Are PFAS in all cleaning products?
No. They're most associated with stain- and water-resistant treatments, but they've been reported in some detergents and maintenance products. They're rarely labeled, which is the real problem.
What are the health concerns?
EPA links PFAS to decreased fertility and developmental effects in children, among others, and broader research associates them with certain cancers and thyroid, liver, and immune effects.
Sources
- Forever Chemicals: What are PFAS and How to Reduce Your Exposure — Brown University Health
- Yale Experts Explain PFAS 'Forever Chemicals' — Yale Sustainability
- 'Forever chemicals' - the part of cleaning you don't want to last — Environmental Working Group
Ingredient safety data changes as new research is published, and product formulas change over time. Always read the current label and check primary sources.
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