What Is California Prop 65?
California Proposition 65, officially the Safe Drinking Water and Toxic Enforcement Act of 1986, is a consumer right-to-know law approved by California voters in 1986. It is administered by the Office of Environmental Health Hazard Assessment (OEHHA).
Core requirement: Businesses selling products in California (with 10 or more employees) must provide a clear and reasonable warning before consumer exposure if their products contain chemicals known to cause cancer or reproductive harm.
Key point: Prop 65 does not directly ban chemicals; it requires warning labels. Because warnings can hurt sales, many companies choose to reduce or substitute the substances.
Scope
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Any business that sells, distributes or imports products in California
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Including cross-border e-commerce (Chinese sellers on Amazon and eBay are frequent targets of lawsuits)
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Even small sales volumes in California establish jurisdiction
Listed Chemicals
The OEHHA list contains about 900+ chemicals in two categories:
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Carcinogens (Cancer) – lead, cadmium, benzene, formaldehyde, nickel compounds, etc.
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Reproductive toxicants – lead, phthalates (DEHP, DBP, BBP), bisphenol A, etc.
The list is updated several times a year.
Safe Harbor Levels
OEHHA has set daily exposure limits for about 300 substances:
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NSRL – “No Significant Risk Level” for carcinogens
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MADL – “Maximum Allowable Dose Level” for reproductive toxicants
| Common substance | Limit (reference) |
|---|---|
| Lead | Oral 0.5 μg/day |
| Cadmium | Oral 4.1 μg/day |
| DEHP | Oral 410 μg/day |
| BPA | Dermal 3 μg/day |
Below the limit → no warning needed; above the limit → warning or reformulation required.
High-Risk Product Categories
| Product | Key substances to test |
|---|---|
| Electronics | Lead, cadmium, phthalates, flame retardants |
| Toys and children’s products | Lead, phthalates, cadmium |
| Apparel and textiles | Formaldehyde, azo dyes, phthalates |
| Cosmetics | Lead, mercury, phthalates |
| Furniture | Flame retardants, formaldehyde, lead |
| Food packaging | Lead, bisphenol A, PFAS |
| Jewelry | Lead, cadmium |
| PVC products | Phthalates |
Warning Labels – Major 2025 Amendments
Effective 1 January 2025, with full mandatory compliance from 1 January 2028 (3-year transition period).
New short-form warning requirements
Must include:
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Yellow triangle + black exclamation mark
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“WARNING” / “CA WARNING” / “CALIFORNIA WARNING” (all caps, bold)
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At least one specific chemical name (not required under the old version)
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Type of risk: cancer / reproductive harm
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Link to www.P65Warnings.ca.gov
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Font size no smaller than 6 point
Example:
⚠️ WARNING: Cancer risk from lead exposure. www.P65Warnings.ca.gov
Online sales warnings
For online products, the warning must be provided on the product display page or through a clearly marked warning link, visible before checkout.
Key Dates
| Date | Milestone |
|---|---|
| 1 January 2025 | New short-form warning takes effect; companies can begin transitioning |
| 31 December 2027 | End of the unlimited sell-through period for old warnings |
| 1 January 2028 | New short-form warning mandatory – all newly manufactured products must comply |
Penalties
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Civil penalties: up to USD 2,500 per violation per day
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Private enforcement – California environmental law firms issue thousands of 60-Day Notices every year
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Typical settlements: from thousands to millions of dollars
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Chinese cross-border e-commerce sellers are frequent targets
Testing and Compliance Process
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BOM analysis – identify high-risk components (solder, PVC, coatings, batteries, etc.)
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Third-party laboratory testing – ISO 17025 labs such as SGS, Intertek, TÜV and UL
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Exposure assessment – calculate actual exposure and compare with NSRL/MADL
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Decision: reformulate/substitute vs. add a warning
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Label compliance – complete the transition to the new short form before 2028
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E-commerce platform updates – update listings on Amazon and other platforms
Typical Testing Costs (USD)
| Item | Reference cost |
|---|---|
| Single metal test (lead, cadmium, etc.) | $50–150 per substance |
| Phthalate panel (8 substances) | $150–300 per sample |
| Full electronics panel | $500–1,500 per sample |
| Full toy testing | $800–2,000 per sample |
| Risk assessment + labeling consulting | $2,000–10,000 |
How Prop 65 Differs from Other Regulations
| Regulation | Scope | Relationship |
|---|---|---|
| CPSIA (US Consumer Product Safety Improvement Act) | Nationwide (US) | Partial overlap |
| EU REACH | EU chemicals | Partial list overlap |
| EU RoHS | Electronics | Overlap on lead, cadmium, etc. |
Important: Complying with REACH / RoHS does not mean complying with Prop 65 – the Prop 65 list is broader, and it requires “warnings” rather than “bans”.
Prop 65 is the strictest chemical warning law in the US – it does not ban substances but requires warning labels; enforcement is highly active (especially private lawsuits), and penalties can reach USD 2,500 per day per violation. Chinese cross-border e-commerce sellers must complete the transition to the new short-form warning before 1 January 2028, and use third-party laboratory testing + exposure assessment to determine whether a warning is needed.