Compliance with Prop 65 Labeling Requirements

Reviewed by Jason Foscolo, Food & Beverage Attorney — Founder, Foscolo & Diefenbach PLLC (The Food Law Firm). Former USMC JAG; LL.M. in Agricultural & Food Law (University of Arkansas).
Reviewed by a licensed attorney. Last reviewed: June 2026.

This article is general information about California Proposition 65, not legal advice, and does not create an attorney–client relationship. Consult qualified counsel about your specific facts.

Compliance with Prop 65 labeling requirements is an absolute risk-mitigation tool for companies selling food in California. This article explains how to apply the statutory warning and outlines alternative compliance strategies that help food manufacturers manage risk and preserve market access.

California’s Proposition 65 requires businesses to include a specific warning label on consumer products that expose users to chemicals known to cause cancer or reproductive harm. The statutory warning in 27 Cal. Code Regs. § 25607.2(a) must clearly state the name of at least one listed chemical and identify the type of risk. Applying the full text is the most direct route to avoiding litigation. For food products, the most common phrasing is:

“⚠ WARNING: Consuming this product can expose you to [chemical name], which is known to the State of California to cause [cancer, birth defects, or other reproductive harm].”

This language must appear in a conspicuous font and size, often near the product’s principal display panel or in accompanying marketing materials. The California Office of Environmental Health Hazard Assessment (OEHHA) maintains the full list of regulated chemicals and regularly updates the required language standards.

The single most useful reference for a compliance team is a map of which listed chemicals show up in which food categories. This quick-reference is a starting point only—OEHHA’s list is authoritative and changes—but it orients your testing and labeling decisions:

A food product can implicate more than one chemical, and the correct response is a tested, documented strategy—not a reflexive warning. The alternatives below often serve a manufacturer better than blanket labeling.

Most manufacturers do not sell products exclusively to the California market. Products from the same production batch often ship nationwide, and companies hesitate to affix warning labels that might confuse or alarm consumers in other states who are simply not that familiar with Prop 65. A Prop 65 badge can imply that a product is unsafe even when exposure levels fall far below federally recognized risk thresholds, and retailers outside California may reject labeled inventory as a result. For that reason, if a manufacturer is reluctant to use the statutory language, it is important to explore alternative labeling strategies that reduce litigation risk while maintaining consumer confidence in food products that may contain trace amounts of listed chemicals.

Several proactive methods reduce risk without undermining consumer trust:

• Finished-Product Testing. Routine laboratory testing of finished products can confirm that chemical levels in each batch fall below the NSRL or MADL. Lots that exceed Prop 65 thresholds need not be discarded—they remain eligible for sale in other states. Once testing identifies an over-threshold lot, the manufacturer diverts that batch to markets outside California, avoiding labeling altogether. This requires tight logistics, traceability, and lot control.
• Supplier Indemnification and Product Specifications. Upstream compliance starts with robust supplier contracts. Manufacturers often include Prop 65 indemnity clauses and require suppliers to warrant that ingredients are free from listed chemicals at actionable levels. These obligations should be tied to detailed product specifications and supported by supplier testing protocols.
• Customer Waivers and Contractual Risk Allocation. For private-label or copacking arrangements, manufacturers should shift Prop 65 compliance downstream. Written agreements may assign responsibility for labeling, regulatory compliance, and legal defense to the brand owner or distributor. These contracts require careful drafting and should include indemnity and waiver provisions covering Proposition 65 exposure claims.

Compliance with Prop 65 labeling requirements should not be a reaction to potential litigation. Instead, manufacturers should employ some or all of these steps proactively—well before receiving a 60-day notice from a Proposition 65 plaintiff’s firm. Early action and thoughtful planning can integrate testing protocols, supplier warranties, and contractual risk-shifting into standard operations, letting food businesses limit liability and control outcomes long before litigation begins. Ultimately, a disciplined, preventive approach is far cheaper and more effective than mounting a defense after a claim. Already received a 60-day notice? Compliance planning becomes active defense—read the litigation-defense analysis or contact us right away.

If you ship many SKUs into California, an annual Prop 65 label-and-testing sweep is a recurring need. Our Fractional General Counsel plans include ongoing label review, supplier-warranty management, and reg-change alerts under one flat fee. See Sustain or Boost →

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Jason Foscolo Founder of The Food Law Firm — fractional general counsel for food & beverage businesses nationwide.

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