AI-Powered California Prop 65 Compliance Software for Manufacturers

You’ll need to determine whether your products contain any of the chemicals on the Prop 65 list and whether consumers could be exposed. That starts with collecting data from your suppliers about materials, ingredients, and components to find out what substances are present.

If your products exceed what’s called a “safe harbor” exposure level, you must provide a clear and reasonable Prop 65 warning label on the product, packaging, or online listing.

California Proposition 65, also known as the Safe Drinking Water and Toxic Enforcement Act of 1986, is a state law that protects consumers from exposure to chemicals known to cause cancer or reproductive harm. If you sell or distribute products in California, Prop 65 applies to you. The law requires businesses to provide clear Prop 65 warnings when their products contain listed substances. With over 1,000 chemicals on the list and new ones added every year, compliance starts with knowing what’s in your products

Assent’s Prop 65 compliance platform combines software automation with regulatory expertise to help manufacturers:

• Identify chemicals on the Prop 65 list in products and parts.
• Manage supplier outreach and data validation at scale.
• Generate accurate Prop 65 warning labels and reports.
• Stay aligned with OEHHA updates and new safe-harbor levels.
• Maintain audit-ready records and reduce legal exposure.

By turning compliance into a structured, data-driven process, Assent helps you reduce Prop 65 risk, lower operational costs, and maintain market access with confidence.

Yes. For e-commerce, Prop 65 requires that a clear warning appear on the product page before purchase. Online warnings must match the language and visibility standards used on the physical product label.

Safe-harbor levels are exposure thresholds that help determine when a Prop 65 warning is required.

• No Significant Risk Levels (NSRLs) apply to cancer-causing chemicals.
• Maximum Allowable Dose Levels (MADLs) apply to reproductive toxins.

If exposure to a chemical stays below these limits, measured in micrograms per day, no warning is required. But if it exceeds these levels, manufacturers must label the product accordingly. Because many chemicals don’t have an official safe-harbor level, companies often err on the side of caution and label proactively.