California Prop 65 and Fragrance Products: What Importers Must Know

California’s Proposition 65, formally the Safe Drinking Water and Toxic Enforcement Act of 1986, is the single most litigated consumer product regulation in the United States, and fragrance products are a frequent target. Any brand selling candles, diffusers, room sprays, or essential oils into California, which in practice means any brand selling nationwide through Amazon or major retail, must understand how Prop 65 applies. This guide explains the law, the chemicals that matter for fragrance, and the cost of getting it wrong.

What Prop 65 Actually Requires

Prop 65 requires businesses to provide a “clear and reasonable” warning before knowingly exposing California consumers to any chemical on the state’s published list above a safe-harbor level. The list, maintained by the California Office of Environmental Health Hazard Assessment (OEHHA), contains over 950 chemicals as of 2025, including carcinogens and reproductive toxicants.

The law is enforced through a unique mechanism: private plaintiffs, often called “bounty hunters,” can sue on behalf of the state and recover 25 percent of penalties plus attorney fees. The result is a cottage industry of enforcement, with over USD 50 million in settlements paid by consumer product companies in 2023 alone according to the California Attorney General’s office.

Fragrance-Relevant Chemicals on the Prop 65 List

Several chemicals commonly associated with fragrance formulations appear on the Prop 65 list:

Chemical	Where it appears	Safe-harbor level
Diethylhexyl phthalate (DEHP)	Some legacy fragrance plasticizers	4.1 micrograms/day
Dibutyl phthalate (DBP)	Some fragrance carriers	0.77 micrograms/day
Formaldehyde	Trace in some preservatives	40 micrograms/day (inhalation)
Toluene	Trace solvent in some fragrance oils	770 micrograms/day
Benzene	Trace contaminant	0.27 micrograms/day
Carbon black	Some pigments and dyes	1 microgram/day
Titanium dioxide (airborne, unbound)	Powdered products only	Not relevant for liquid/candle
Wood dust	Wood wicks during sanding only	Not relevant for end consumer

Modern IFRA-compliant fragrance houses have largely eliminated phthalates from mainstream formulations, but trace contaminants and certain natural essential oil constituents (for example, safrole in sassafras, methyleugenol in some basil oils) can still trigger evaluation.

When a Warning Is Required

A Prop 65 warning is required when:

1. The product contains a listed chemical, AND
2. Consumer exposure exceeds the safe-harbor level (No Significant Risk Level for carcinogens, or Maximum Allowable Dose Level for reproductive toxicants), AND
3. The product is sold or distributed in California.

For most modern candles and reed diffusers using IFRA-compliant fragrance and clean wax, exposure is below safe-harbor levels and no warning is required. However, the burden of proof lies with the defendant, which is why many brands add a precautionary warning even when exposure is theoretically negligible.

Warning Format Requirements

Since the August 2018 amendments, Prop 65 warnings must follow a specific format:

• The signal word “WARNING” in bold uppercase
• The text: “This product can expose you to chemicals including [chemical name], which is known to the State of California to cause [cancer / birth defects or other reproductive harm]. For more information go to www.P65Warnings.ca.gov.”
• A triangular warning symbol (yellow with black exclamation point) for physical labels
• Specific chemical naming for at least one listed chemical (generic “chemicals” wording is no longer sufficient for most categories)

For online sales, the warning must appear on the product detail page before purchase, not just on the physical label.

The Practical Decision: Warn or Test

Brands face a strategic choice:

Option A: Add a precautionary warning

• Cost: near zero (label artwork change)
• Risk: minor consumer perception impact; some retailers (notably Whole Foods) restrict products with Prop 65 warnings
• Best for: brands selling primarily through Amazon and direct channels

Option B: Test and document no-warning position

• Cost: USD 500 to USD 2,000 per SKU for chemical screening via GC-MS or ICP-MS at SGS, Intertek, or Eurofins
• Risk: residual litigation exposure if testing methodology is challenged
• Best for: premium brands and retailers with warning-restriction policies

Most US importers of Chinese-manufactured fragrance products choose a hybrid: test the top SKUs, document the methodology, and add a precautionary warning to anything with uncertain exposure.

Working with Your Chinese Manufacturer

A competent OEM should provide:

• Full fragrance disclosure to the factory’s QC team (not the brand, due to trade secret protection, but enough for Prop 65 evaluation)
• IFRA certificate confirming restricted-substance compliance
• Phthalate-free and heavy-metal-free declarations
• SDS with full ingredient disclosure for any hazardous constituents
• Wax purity documentation, particularly for paraffin (which can contain trace PAHs)

At Aromiso, every fragrance formulation is screened against the current Prop 65 list before being approved for US-bound production, and brands receive a written evaluation summarizing which chemicals were tested and the resulting exposure estimate.

Cost of Non-Compliance

The average Prop 65 settlement in the consumer products category ranges from USD 25,000 to USD 60,000, including penalties, plaintiff attorney fees, and mandatory reformulation. Repeat defendants have paid seven-figure settlements. Beyond direct cost, a 60-day Notice of Violation triggers legal defense expenses of USD 10,000 to USD 30,000 even when the case is defensible.

The cost of prevention, roughly USD 1,000 to USD 3,000 per SKU for testing and label review, is trivial by comparison.

Final Thoughts

Prop 65 is not optional for any US brand selling fragrance products through national channels. Treat it as a product development input: screen formulations against the OEHHA list before production, document exposure analysis, and decide deliberately whether to warn or to defend a no-warning position. Brands that ignore Prop 65 until they receive a 60-day notice are paying the most expensive tuition in the consumer products industry.