forever chemical

noun

plural forever chemicals

: a toxic substance and especially a synthetic chemical (as of the per- and polyfluoroalkyl substances group) that persists and accumulates in the environment

—not used technically

Canadian researchers have discovered high levels of a "forever chemical", used in making toilet paper, in the bodies of endangered killer whales, sparking fears the toxic substance could further harm them.

—Leyland Ceccoin

Landfills, military bases and firefighting training centers also are thought to be sources of forever chemical pollution.

—Sammy Fretwell

—often used in plural

PFAS, or per- and polyfluoroalkyl substances, are colloquially known as "forever chemicals" because they are so difficult to break down.

—Layne Cameron

Forever chemicals are used as surface treatments to block water and stains. In fact, a 2022 report by Toxic-Free Future, an environmental health research and advocacy organization, found that nearly three-quarters of products labeled as water- or stain-resistant tested positive for them.

—Hannah Norman

PFAS, a group of manufactured chemicals commonly used since the 1940s, are called "forever chemicals" for a reason. Bacteria can't eat them; fire can't incinerate them; and water can't dilute them.

—Amanda Morris

Van Zile said many people love a Wisconsin Friday fish fry, but many fish are found with high levels of forever chemicals, such as mercury, and that we're slowly poisoning ourselves.

—Frank Vaisvilas

Examples of forever chemical in a Sentence

Recent Examples on the Web

The Environmental Protection Agency (EPA) has proposed approving another pesticide containing forever chemicals for use on crops such as canola, corn, soybeans, and wheat, a move that has sparked significant concern among environmentalists and experts. —Jasmine Laws, MSNBC Newsweek, 14 Nov. 2025

Part of this discount may be related to DuPont’s lingering liability around PFAS forever chemicals, despite the company’s multiple efforts to ring-fence and contain its legal exposure. —Jeff Marks, CNBC, 15 Oct. 2025

The final version, which retained the calculations published in the draft report, was completed shortly before the EPA announced its intention in May to rescind and reconsider limits on the amount of PFNA and several other forever chemicals allowed in drinking water. —Sharon Lerner, ProPublica, 10 Oct. 2025

Public health officials have been increasingly raising the alarm about forever chemicals in recent years. —Rebecca Schneid, Time, 14 Sep. 2025

Word History

First Known Use

2018, in the meaning defined above

Rhymes for forever chemical

• electrochemical
• immunochemical
• physicochemical
• physiochemical
• radiochemical
• stereochemical
• academical
• agrochemical
• biochemical
• cytochemical
• geochemical
• histochemical