Federal compliance gets you through customs. State law is what gets you sued. For US importers of Thai-made consumer goods, California Proposition 65 is the single most common source of post-entry legal cost — and it is almost entirely preventable at the factory.
What Prop 65 actually requires
Proposition 65 does not ban chemicals. It requires a clear and reasonable warning before knowingly exposing a Californian to any of roughly 900 listed chemicals above the safe harbour level. Enforcement is largely private: bounty-hunter plaintiff firms buy products, test them, and serve a 60-day notice.
Typical settlement economics in 2026:
| Item | Range |
|---|---|
| Civil penalty | USD 2,500–15,000 per product |
| Plaintiff attorney fees | USD 20,000–90,000 |
| Reformulation or relabel cost | Varies |
| Your own defence cost | USD 15,000+ even when you settle early |
The claim goes to whoever sold the product in California, which for an importer means you — not the Thai factory.
Chemicals that catch Thai-origin goods
| Chemical | Common source |
|---|---|
| Lead and cadmium | Brass fittings, PVC cord jackets, ceramic glaze, painted metal, costume jewellery |
| DEHP, DBP, BBP and other phthalates | Flexible PVC, vinyl bags, cords, soft grips |
| BPA | Can linings, polycarbonate, thermal receipt paper |
| Acrylamide | Fried and roasted food products |
| Formaldehyde | Composite wood, some textile finishes |
| Nickel | Metal jewellery and fasteners in prolonged skin contact |
| PFAS | Water-repellent textiles, coated cookware, food packaging |
Flexible PVC and brass are the two recurring offenders. A Thai factory that sources cord sets or brass valves from a sub-supplier may have no visibility into either.
Getting the warning right
The safe harbour warning must include the yellow triangle pictogram, the word WARNING in bold capitals, the name of at least one listed chemical, and a link to www.P65Warnings.ca.gov. Short-form warnings are permitted on small packages under the current rules, but the long form is safer for products sold across multiple channels.
Where to place it: on the product label or packaging, and — critically — on the product detail page of any website that ships to California. Amazon and Walmart Marketplace both have a Prop 65 field in item setup. Leaving it blank is a common cause of listing suppression.
Warning without testing is a defensible fallback, but it costs conversion. Testing and reformulating is better where volume justifies it.
Beyond California
| Law | Scope | Practical effect |
|---|---|---|
| State PFAS bans (ME, MN, CA, WA and others) | Textiles, cookware, food packaging, juvenile products | Certificates of non-intentional addition, staged bans through 2026–2032 |
| Toxics in Packaging (19 states) | All packaging | No intentionally added lead, cadmium, mercury, hexavalent chromium; sum under 100 ppm |
| Extended Producer Responsibility (CA, CO, ME, MN, OR) | Packaging and paper | Registration and fees based on packaging weight and recyclability |
| Flame retardant restrictions (CA, NY and others) | Upholstered furniture, juvenile products | TB 117-2013 labelling; bans on certain retardants |
| State battery and e-waste rules | Electronics | Registration and take-back obligations |
EPR is the newest surprise for small importers: several states now require producer registration even at modest volumes, with fees assessed on packaging placed into the state.
What to build into the Thai purchase order
- A written restricted substances list (RSL) attached to the PO, in Thai and English.
- A requirement for a third-party lab report per material and per production lot for lead, cadmium, phthalates, and where relevant PFAS.
- A ban on unapproved sub-supplier substitution of cords, fasteners, coatings, or packaging.
- Retained samples from every production run, held for three years.
- A contractual indemnity — meaningful only if you contract with an accountable party rather than an offshore factory.
Testing an average consumer SKU to a US retail RSL runs USD 400–1,200 per material set at a Bangkok branch of a major lab. Against a five-figure Prop 65 settlement, that is cheap insurance.
Related reading: our USA CPSC compliance guide, FDA compliance for Thai imports, and product testing and QC guide.
FAQ
Does Prop 65 apply if I only sell on Amazon?
Yes. If the product can be shipped to a customer in California, the warning obligation applies, and Amazon requires you to populate the Prop 65 fields during listing setup. Marketplace sellers receive 60-day notices regularly; being an online-only seller offers no protection.
Can I just put the warning on everything to be safe?
Over-warning is legal and is a common defensive strategy, but it has costs. Some retailers reject over-warned items, some categories see measurable conversion loss, and a warning naming the wrong chemical can still be challenged. For high-volume SKUs, test and reformulate; for long-tail items, warn.
Who is liable — me or the Thai factory?
The party that sells or distributes the product in California. As importer of record and seller, that is you. A contractual indemnity from an offshore factory is often unenforceable in practice, which is why testing before shipment matters more than warranty language.
What does compliance testing cost in Thailand?
Roughly USD 400–1,200 per material set at the Bangkok laboratories of the major international testing houses, depending on the number of analytes. Lead, cadmium, and phthalate screening on a simple product is at the lower end; a full PFAS and RSL package for textiles is at the upper end.
Are PFAS rules really relevant to Thai suppliers?
Increasingly, yes. Water-repellent textile finishes, non-stick coatings, and grease-resistant food packaging are the main exposures, and several US states have staged bans running from 2026 onward. Ask for a written statement of no intentionally added PFAS plus supporting test data on the finish, not just on the base fabric.
What is EPR and do small importers have to register?
Extended Producer Responsibility makes the brand owner responsible for the recycling cost of packaging placed into a state. California, Colorado, Maine, Minnesota, and Oregon have programs live or phasing in, generally with small-producer exemptions based on revenue or tonnage. Check each state's threshold before assuming you are exempt.