What is the verification status of this claim?

This claim is currently marked as "CONFIRMED". The verification is based on 1 primary sources and 1 total sources reviewed by the They Knew community.

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How many sources support this claim?

There are 1 total sources associated with this claim, of which 1 are primary sources (court documents, FOIA releases, official records).

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3M's PFAS Cover-Up: 40 Years of Hidden Chemical Contamination | They Knew | They Knew

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3M Company Hid PFAS Contamination Knowledge from Public for 40 Years

3M Company Hid PFAS Contamination Knowledge from Public for 40 Years — documented evidence

CONFIRMED

3M knew PFAS chemicals accumulated in blood and caused health problems since 1970s but continued production. Company studies showed environmental contamination while claiming safety.

3M Company Hid PFAS Contamination Knowledge from Public for 40 Years

Environmental·May 1, 1978·1.6K upvotes·140 comments

What They Said Was Crazy

“PFAS chemicals are safe at current exposure levels and do not bioaccumulate harmfully”

May 1, 1978Source

The Receipts

★

PRIMARY3M knew about PFAS dangers decades ago, Minnesota lawsuit documents allege - The Guardian

www.theguardian.com/environment/2018/jul/31/3m-pfa...

ARTICLEOpen

The Vindication Timeline

From “crazy” to confirmed

May 1, 1978

The Claim Is Made

This is the moment they called it crazy.

📢

May 1, 1978

The Claim Is Made

This is the moment they called it crazy.

How Right We Were

Evidence strength

5/10

Source diversity

3/10

Community consensus100% agree

The People Speak(140)

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Case File

StatusCONFIRMED

CategoryEnvironmental

ClaimedMay 1, 1978

VerifiedMarch 27, 2026

Sources1 (1 primary)

Upvotes1616

Comments140

UpdatedMarch 27, 2026

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How This Was Verified

Claims are verified through cross-referencing publicly available court records, government documents, journalistic investigations, and community-submitted evidence. Status reflects current assessment and may change as new evidence emerges.

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