WD-40
Last verified: April 2026
Read our full verification: Is WD-40 Made in USA?Verification Summary
American Score
Manufacturing Location
San Diego, CA
Headquarters
San Diego, CA
Founded
1953
Products Verified
1 product
Evidence Breakdown
Factory Location Specificity
Specific factory city identified
Website Claim
No explicit Made in USA claim on website
Manufacturing History
20+ years of USA manufacturing
Known Overseas Production
No known overseas production
Verification Notes
WD-40 Company has formulated and manufactured its flagship multi-use product in San Diego, California since 1953. Formula developed by Norm Larsen in 1953. Made in USA claim on core product lines. WD-40 Specialist series and original multi-use product manufactured in San Diego. Iconic American industrial product.
Last verified: April 2026
Manufacturing Profile
WD-40 manufactures at a specific factory location in San Diego, CA. Founded in 1953 (73 years of US production on the books). Our 1 verified WD-40 listing sits in automotive.
Verification tier
73% average
Brand-verified — brand evidence holds, product-level evidence still firming up
Factory evidence
Specific city
San Diego, CA
Catalog breadth
1 product
1 category
How we verified WD-40
Most recent check: Oct 16, 2026
From the brand's website
“In 1953, a fledgling company called Rocket Chemical Company”
wd40.com · checked Oct 10, 2026
Amazon listings
We read the live Amazon listing for 1 of the 1 WD-40 product on this page (most recently Oct 16, 2026). None of them states where the product is made, so these products rely on the brand-level evidence above.
Company history
“In 1953, a fledgling company called Rocket Chemical Company”
wd40.com · checked Oct 10, 2026
These checks are run by our software on a schedule: brand websites are re-read about every three weeks, Amazon listings weekly, and news is scanned monthly. Every flag is checked against its original source before anything on this page changes. How the American Score works.
WD-40 has been manufacturing products in San Diego, CA since 1953. We carry 1 verified American-made WD-40 product.
Heritage & History
WD-40 was developed in 1953 by Norm Larsen, a chemist at the Rocket Chemical Company in San Diego, California. Larsen was working on a formula to displace water and prevent rust on Atlas missile components — the WD stands for Water Displacement, and 40 was the number of attempts before the formula succeeded. The product proved so effective that Convair aerospace engineers began smuggling cans out of the plant for personal use, leading Rocket Chemical to market it to consumers in 1958.
The WD-40 Company has been headquartered in San Diego since its founding, and the formula has remained in San Diego production for over 70 years. The original formulation — a trade secret never patented to prevent disclosure — has been refined but not fundamentally changed. This continuity of place and formula is unusual in consumer products.
Made in San Diego, California
WD-40 is formulated and filled at the San Diego production facility. The formula is a trade secret, but its documented performance characteristics — water displacement, rust prevention, lubrication, and penetration of seized fasteners — have been consistent across production batches for seven decades. This consistency is the result of maintaining production at the original San Diego facility with the same quality control standards that defined the aerospace-grade product.
The WD-40 Specialist line extends the brand into purpose-specific products: a PTFE dry lubricant, a penetrating catalyst, and a rust-removing soak. These products are also formulated in San Diego, representing the company's investment in developing more targeted chemistries for specific applications rather than relying solely on the original multi-use formula.
What Sets Them Apart
WD-40's market position is based on 70 years of demonstrated performance across essentially every application a lubricant and water displacer can be used for — a track record that has made the blue and yellow can a default in American garages, workshops, and tool boxes. The brand's penetrating capability for rusted fasteners, combined with its availability in virtually every retail outlet in America, makes it the first choice for the majority of household and workshop applications.
The Specialist Penetrant is a better choice than standard WD-40 for heavily corroded fasteners — the concentrated penetrating formula has lower surface tension and better capillary action into tight threads than the multi-use product. For buyers who regularly deal with seized hardware in older equipment or vehicles, investing in both products and using the Specialist for the serious jobs is the practical approach.
Frequently Asked Questions
Is WD-40 made in the USA?
Yes. WD-40 manufactures 1 verified product in San Diego, CA. WD-40 has been formulated in San Diego, California since 1953, when Norm Larsen developed the water-displacing formula for the aerospace industry, creating the most recognized household lubricant in American manufacturing history.
Where is WD-40 manufactured?
WD-40 is headquartered in San Diego, CA. Manufacturing takes place in San Diego, CA.
What WD-40 products can I buy?
We carry 1 verified WD-40 product across Automotive. Every listing links directly to a trusted online store with verified American manufacturing.
When was WD-40 founded?
WD-40 was founded in 1953. WD-40 has been formulated in San Diego, California since 1953, when Norm Larsen developed the water-displacing formula for the aerospace industry, creating the most recognized household lubricant in American manufacturing history.
Where can I buy WD-40 products?
Every WD-40 product listed here links to a trusted online store — a major retailer or the brand's own shop — where you can purchase directly.
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