California Prop 65 and Pet Products: What Importers Must Know

California Proposition 65 is the single most feared regulation among small Amazon sellers and pet product importers in the US. It is misunderstood, aggressively enforced, and expensive to violate. Unlike FCC or CE, Prop 65 applies only in California, but because California is 12 percent of the US population, it effectively covers the entire US e-commerce market. This article explains what Prop 65 is, how it applies to pet products, and how to comply without overpaying for warning labels you do not need. Written from Hefei, China, by Eviehome (Hefei Ecologie Vie Home Technology Co., Ltd.).

What is California Prop 65

California Proposition 65 (the Safe Drinking Water and Toxic Enforcement Act of 1986) requires businesses to warn California consumers about significant exposure to chemicals known to the state to cause cancer, birth defects, or reproductive harm. The list includes 900+ chemicals and is updated regularly.

The warning is the familiar “WARNING: This product can expose you to chemicals including [name], which is known to the State of California to cause [cancer/birth defects/reproductive harm]. For more information go to P65Warnings.ca.gov” label.

Why Prop 65 matters for pet products

Pet products are in scope because:

• Many pet product materials (plastics, metals, inks, adhesives) can contain listed chemicals
• California is a massive e-commerce market
• Amazon enforces Prop 65 compliance through product listing requirements
• Plaintiffs lawyers actively sue non-compliant sellers under Prop 65
• Penalties can reach USD 2 500 per day per violation

How Prop 65 enforcement works

Prop 65 is enforced in three ways:

1. Private enforcement (the biggest risk)

Private citizens (usually represented by specialized law firms) can sue non-compliant businesses for lack of warning labels. The plaintiff does not need to prove actual harm, only that the product contains a listed chemical above the “safe harbor” level without a warning. These lawsuits generate tens of millions of dollars in settlements each year.

2. California Attorney General enforcement

Less common but carries heavier penalties and public shaming.

3. Amazon compliance enforcement

Amazon requires sellers to declare Prop 65 compliance in product listings. Listings without proper warnings (where required) can be removed.

The “safe harbor” thresholds

A product is not automatically “non-compliant” just because it contains a listed chemical. It is non-compliant if the exposure exceeds the “No Significant Risk Level” (NSRL) for cancer or the “Maximum Allowable Dose Level” (MADL) for reproductive harm.

These levels vary by chemical. Lead, for example, has a MADL of 0.5 micrograms per day for reproductive harm. This is a very low threshold that many consumer products exceed.

For practical purposes, most electronic pet products containing electronic components, lead solder, or PVC parts should either have a Prop 65 warning or have testing proving they are below the threshold.

Two compliance strategies

Strategy A: Test and avoid

Have the product tested by an accredited lab to measure actual chemical content. If the content is below the safe harbor level, no warning is required. This strategy is cleaner but requires periodic testing (USD 500 to 2 000 per product per year).

Best for: brands with premium positioning where a warning label would hurt sales.

Strategy B: Label and warn

Assume the product may contain listed chemicals and apply the Prop 65 warning label. No testing needed. Warning must be visible on the product, packaging, and online listing.

Best for: budget brands where warning labels are acceptable and cost savings matter.

Many brands use Strategy B by default because it is cheaper and simpler.

The required warning format

As of 2018, the warning must include:

• The word “WARNING” in all capitals
• The black and yellow triangular warning symbol
• The specific chemical name that triggered the warning (e.g., “lead” or “phthalates”)
• The hazard type (“cancer” or “birth defects or reproductive harm”)
• A link to P65Warnings.ca.gov

Generic warnings that do not name the specific chemical are no longer compliant.

Where to place the warning

• On the product itself: sticker or printed label
• On the retail packaging: printed on the box
• In the Amazon product listing: in the description or a specific Prop 65 field
• On the website: product page or checkout page for California buyers

Amazon and Walmart have specific Prop 65 compliance fields in their seller dashboards. Fill them out accurately.

Common Prop 65 warnings for pet products

The most common chemicals triggering warnings on pet products:

• Lead: found in metal parts, solder, some plastic colorants. Very common trigger.
• DEHP and other phthalates: in PVC plastic parts, cables, soft components.
• Cadmium: in some metals and plastics.
• BPA (Bisphenol A): in some plastics, particularly polycarbonate.
• Formaldehyde: in wood products and some adhesives.

Cost of non-compliance

• Civil penalty: up to USD 2 500 per day per violation. For a product sold to 1 000 California customers without warning, this can total millions in theoretical exposure.
• Private plaintiff settlements: typically USD 10 000 to 250 000 per case. Many small Amazon sellers have faced these.
• Plaintiff attorney fees: awarded to the winning party, often 3 to 5 times the settlement.
• Product removal from Amazon and Walmart: immediate revenue loss.

How to avoid Prop 65 lawsuits

1. Apply the warning by default: if you are not sure, add the label. It is cheaper than a lawsuit.
2. Use Prop 65 compliant materials: ask the factory for lead-free solder, phthalate-free plastics, BPA-free components.
3. Test the final product: verify actual chemical content before launch.
4. Document compliance: keep test reports and certification letters as a defense if sued.
5. Monitor the chemical list: California adds chemicals regularly. Periodic review is needed.
6. Maintain product liability insurance: covers defense costs if sued.

Is Prop 65 enforceable against factories in China?

No. Prop 65 is enforced against sellers selling into California, not against foreign manufacturers. The importer (you) is the legally responsible party. This is why you must understand Prop 65 even if your factory does not.

Frequently asked questions

Is Prop 65 compliance the same as FDA or EPA compliance?

No. Prop 65 is a California-specific law separate from federal regulations. A product can be FDA-compliant and still require a Prop 65 warning.

Can I ship to California without a Prop 65 warning if my product is compliant?

Only if you have tested and can prove the exposure is below the safe harbor level. Otherwise, label it. Without either, you are exposed to liability.

Does Eviehome provide Prop 65 testing?

Yes. We can arrange Prop 65 testing for products destined for the California market through accredited US labs. Contact Ryan Lau for testing scope and pricing.

About Eviehome

Eviehome supports Prop 65 compliance through material selection and testing for US-bound pet products. Based in Hefei, China since 2014. See our certifications and quality page.

Contact Ryan Lau at ryanlau@eviehometech.com, on WhatsApp at +86 199 5653 0913, or use the contact form.