Why does my watch have a Prop 65 warning?

Search this question and you get forum threads, one notice from the Attorney General's files, and the same general Prop 65 page copied across online shops. None of them says which chemical is in a watch, or where. Below: what the warning is and how to read the label. Then every watch notice in the state's database, sorted by chemical, and one notice walked through. Last, what the label does and does not tell you.

What a Prop 65 warning is

Proposition 65 is a California law passed by voters in 1986. Its formal name is the Safe Drinking Water and Toxic Enforcement Act of 1986. It does two things that matter here.

First, it makes the state keep a list of chemicals "known to the state to cause cancer or reproductive toxicity" (Health and Safety Code 25249.8). Reproductive toxicity means harm to fertility or to an unborn child, which is why labels say "birth defects or other reproductive harm". A chemical goes on the list in one of three ways. The state's experts find it "clearly shown" to cause that harm. Or an outside body they trust has said so. Or a state or federal agency already requires it to be labeled that way.

Second, it sets the warning rule. Section 25249.6 says: "No person in the course of doing business shall knowingly and intentionally expose any individual to a chemical known to the state to cause cancer or reproductive toxicity without first giving clear and reasonable warning to such individual." A Prop 65 warning is that "clear and reasonable warning". It is a label, a shelf sign or a web notice that tells you the product can expose you to a listed chemical.

Two limits shape who warns. A "person in the course of doing business" does not include anyone "employing fewer than 10 employees" (25249.11). And the warning is not needed where the business "can show that the exposure poses no significant risk" for a cancer chemical (25249.10(c)). For a reproductive chemical, it must show no observable effect at 1,000 times the exposure. The same section puts "the burden of showing" that on the business, not on the state.

That burden is the reason so many products carry the label. A business that has not measured the exposure, or does not want to defend a measurement in court, can warn instead.

How to read the label on your watch

The wording comes from Title 27 of the California Code of Regulations. Section 25603 gives the "safe harbor" text, the wording the state has already accepted as clear and reasonable. There are three forms, and each tells you something different.

1. The full warning, 25603(a). A yellow triangle with a black exclamation point, the word "WARNING:" and then, for a cancer chemical: "This product can expose you to chemicals including [name of one or more chemicals], which is [are] known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov." The reproductive version ends "to cause birth defects or other reproductive harm". It must name a chemical (25601(b)).
2. The new short form, 25603(b). This fits on a small tag. One of its wordings is "Cancer risk from exposure to [name of chemical]. See www.P65Warnings.ca.gov." It also names the chemical. The state added it to the rules in an amendment filed 26 November 2024, in force from 1 January 2025.
3. The old short form, 25603(c). This one reads "Cancer -- www.P65Warnings.ca.gov.", "Reproductive Harm -- www.P65Warnings.ca.gov." or "Cancer and Reproductive Harm -- www.P65Warnings.ca.gov." It names no chemical. It may still be used on "a product manufactured and labeled prior to January 1, 2028, ... regardless of when the product is sold".

So if your tag says only "Cancer" and a web address, that is the old short form, and the label itself cannot tell you which chemical. If it names one, the table below says where in a watch that chemical is usually found.

The label can also be in other places. Section 25602 allows a shelf sign at the point of sale, or a label on the product or its box. For an online sale, it allows a warning on the product page. It also allows a link there marked "WARNING", "CA WARNING" or "CALIFORNIA WARNING". So a watch bought online may show the warning only on the web page and nowhere on the box.

Which chemicals show up in watch notices

Private citizens and groups can enforce Prop 65, not only the state. Before suing, an enforcer must send a 60-day notice to the business and to public prosecutors, and the Attorney General posts it online. Each notice names the chemical and the product. That makes the notice database the one public record of which chemicals turn up in which products.

We searched it on 12 November 2026 for products containing the word "watch". It returned 46 notices. Ten were not about watches: canned clams from a brand called Sea Watch, a curry sauce, two notices on a lanyard and other goods, a door bolt, watch boxes and a repair tool kit. That leaves 36 notices on watches and watch bands, dated October 2004 to October 2026. One of them is a long list of toys that includes a Spider-Man LCD watch. Some name more than one chemical.

The levels come from 27 CCR 25705 for cancer, the "no significant risk" levels, and 27 CCR 25805 for reproductive harm, the "maximum allowable dose" levels. An exposure at or under them needs no warning. For DEHP they are 310 for cancer and 410 by mouth for adults. For lead they are 15 by mouth and 0.5. DINP has a cancer level in 25705 and none in 25805. Section 25705 sets no level for metallic nickel, only for nickel refinery dust (0.8) and nickel subsulfide (0.4). Section 25805 sets one for chromium only by mouth (8.2), which is not how a strap is touched, so the table leaves it out.

Where each one is in a watch

DEHP in vinyl straps. DEHP is di(2-ethylhexyl) phthalate, a softener that makes PVC plastic bend. PVC (polyvinyl chloride) is the "vinyl" in many cheap straps and imitation leather. A 2013 notice from Consumer Advocacy Group was about a watch and watchband kit. It says DEHP was added to the list for cancer on 1 January 1988. It was added for male developmental harm on 24 October 2003. A 2013 notice on CJ Apparel's Caribbean Joe watches names "Vinyl/PVC Watch Straps" outright. A 2020 notice on LG watch bands sold by Walmart named DEHP too. DINP, another phthalate, is named in three notices on bands, including a 2019 notice on Target watch bands. BPA, a chemical used in some hard plastics, appears once, in a 2020 notice on a plastic bumper for an Apple Watch. That one was withdrawn on 25 September 2020. The same day, the same enforcer filed a notice on watch bands naming Thinq Accessories and Walmart.

Lead in leather and vinyl bands. The clearest account is a 2012 notice from the Center for Environmental Health on watches with "watch bands made of leather, vinyl or imitation leather". It names three places the lead comes from. It is used "as a stabilizer in the vinyl or imitation leather materials". It is an ingredient "in some of the dies, paints and other coloring agents". And it is in "the chemicals used in the leather tanning process". It names three routes: hand to mouth, direct ingestion, and absorption "directly through the skin". The settlement that followed describes lead as known "to cause cancer, birth defects or other reproductive harm".

Hexavalent chromium in leather bands. Chromium (VI) is one form of the metal chromium. Two 2026 notices name it: one on a men's Timex watch "with leather components" sold by Boscov's, and one on a Fossil leather watch band sold by Walmart. Both say the main route "is through dermal absorption directly through the skin". Both describe chromium (VI) as listed for cancer and for birth defects or other reproductive harm.

Nickel in steel. Nickel is on the list as a cancer chemical. A 2014 notice on cutlery states it was added on 1 October 1989. 316L, the usual watch steel, is roughly 10 to 14 percent nickel by weight, as our 316L vs 904L comparison sets out, and 904L carries about twice as much. Plating can hold nickel too, as our answer on what "stainless steel back" means shows for one plated case. So a steel watch could carry a nickel warning. But no watch notice in the database names nickel. A maker that warns for nickel is choosing to; nobody has sent a notice about it. Nickel's better-known problem on the wrist is allergy, which is a skin reaction and a separate question from this cancer listing.

One notice walked through: a watch gift set and DEHP

Take notice 2018-00655, the one that shows up in search results for this question. Here is what it says, and what a label that answered it would look like under the rules above. The label wording is worked out from 25603, not copied from any real tag.

1. Who and what. Laurence Vinocur, represented by The Chanler Group, served it on 26 April 2018 on American Exchange Time LLC and Stein Mart. The product type is "Watch Bands". The example is a Jessica Carlyle Watch Gift Set, bought in Sacramento County.
2. The chemical and the harm. DEHP, by "Ingestion, Dermal", for "Birth Defects and Other Reproductive Harm". The notice gives one way it happens: people "touch the products and transfer the listed chemical from the products to their mouths".
3. What it asks for. A recall or warnings for buyers, then "clear and reasonable warnings" or a reformulation "to eliminate the DEHP exposures", and a civil penalty.
4. What happened next. The database shows a complaint filed on 16 August 2018 in San Francisco Superior Court, case CGC-18-568973. We did not find a settlement posted for it.
5. The full label that fits. One chemical and one harm means 25603(a)(2)(B). Since there is one chemical, (E) lets the words "chemicals including" go. So: "WARNING: This product can expose you to di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov."
6. The short labels. The new short form would read "Risk of reproductive harm from exposure to DEHP. See www.P65Warnings.ca.gov." The old one, still allowed on stock labeled before 2028, would read "Reproductive Harm -- www.P65Warnings.ca.gov." Only the old one hides the chemical.

Walk it back from the tag in your hand. "Reproductive Harm" alone on a watch with a vinyl strap points to the strap. That is not a test of your watch; it is where the notices put the chemicals that carry that warning.

What the warning does and does not tell you

The warning tells you one thing for sure. The business did not show, or chose not to show, that the exposure is below the safe-harbor level. It does not tell you the exposure is above it. Nobody has to test before warning.

The levels are small, and they are built with a margin. For a reproductive chemical, the level in 25805 is set so that an exposure "has no observable effect assuming exposure at one thousand (1,000) times that level". So the lead level of 0.5 micrograms a day is set so that even 1,000 times that, 500 micrograms a day, would have no observable effect.

Settlements show what a fix looks like. Grand Time was one of the three firms in the 2012 lead notice. In 2013 it agreed not to sell any covered band with any part over "0.01 percent (100 parts per million ("ppm")) Lead by weight". Paint or coating had to stay under 90 ppm. It paid $25,000 in all. Accutime, in the 2013 DEHP notice, settled with "Reformulation of DEHP to less than 0.1%". Both are reformulation deals: the maker changes the material, after which no warning is needed. The Grand Time agreement also says the parties "do not admit any facts". So even a settled notice is not a finding that the bands held lead.

What to do about it

1. Read the label for a chemical name. If it names one, use the table. If it is the old short form, ask the seller which chemical it covers. The full form has to name one, so the seller should know.
2. If it is the strap, change the strap. Nearly all the notices that name a part point at the band. A new strap takes a pair of spring bars and a few minutes, and our answer on strap length covers sizing. No watch notice in the database names a metal bracelet, and titanium contains no nickel.
3. If you react to nickel, that is a different rule. Prop 65 asks for a warning about cancer. It sets no limit on how much nickel touches your skin. The European rule does, and our page on a watch that irritates your skin explains it, along with what to buy instead. Our guide to watch case materials lists which metals contain none.
4. Wash your hands after handling a new vinyl or leather strap, before you eat. Hand to mouth is a route the DEHP and lead notices above describe.

Why two answers circulate

"It means the watch is toxic" comes from the words on the label. "Known to the State of California to cause cancer" reads like a verdict on the product. It is a statement about the chemical, made by the state, plus a statement that you may be exposed to some of it.

"It means nothing, everything has it" comes from how often the label appears, and the law explains that. The burden sits with the business, small exposures still count unless shown to be small, and warning is cheaper than testing. That answer is half right. The label is often defensive. But on watches it is not random. 32 of the 36 notices name a phthalate or lead, and 18 of the 20 that name a part name the band, strap or leather.

The rules settle it. The label is a warning that a listed chemical may reach you, not a finding that it does at a harmful dose. On a watch, it most often points to the strap.

When this answer stops applying

• Notices are claims. A 60-day notice is what a private enforcer alleges, and the Attorney General does not test the product. We used the notices to show which chemicals and parts enforcers name, not what any one watch contains. Your watch may hold none of them, or a chemical no notice has named.
• Our search has edges. We searched the product field for "watch". A notice that calls a smartwatch band by another name would not show up. We read the notices cited below in full or in part; for the others we used the database's own index entries.
• No warning is not proof of no chemical. A seller with fewer than 10 employees does not have to warn at all.
• This is not medical advice. If a watch has caused a rash, a burn or a reaction, that is a question for a doctor, and our skin irritation page covers the common causes.
• Batteries, lume and other parts. We found no watch notice on a battery or on luminous paint. For radium dials, which are a different hazard with their own rules, see our answer on whether a radium dial is dangerous.
• Outside California. Prop 65 is California law. A label on a watch sold elsewhere tells you the same thing about the chemical, but the warning duty does not apply there.