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
PFAS (per- and polyfluoroalkyl substances) were created in the 1940s to make things repel water, oil, heat, and stains. 1 They earned the "forever chemicals" nickname because they can persist in the environment for an extremely long time rather than breaking down. 12
In a cleaning context, PFAS can appear in stain- and water-resistant treatments and have been reported in some detergents and cleaning or maintenance products. 13 The honest note is that not every cleaner contains them and they're rarely labeled, which is exactly why they're hard to avoid by reading a bottle.
EPA links PFAS exposure to a range of effects including decreased fertility, developmental effects in children such as low birth weight, and other outcomes; broader research associates them with certain cancers, thyroid and liver effects, and immune impacts. 1 In 2024 EPA set the first national drinking-water limits for several PFAS. 1 For households, the realistic move is favoring brands that verify PFAS-free formulas.
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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