California Mandates Dual-Warning Labels for All E-Commerce Sales, Authorizes QR Codes

California is fundamentally changing how online shoppers are warned about chemical exposures. The state's Office of Environmental Health Hazard Assessment (OEHHA) has released its "Omnibus 2026" draft amendments, overhauling the Proposition 65 warning requirements for e-commerce. The new rules mandate a strict dual-warning system for online sales and, for the first time, formally authorize the use of QR codes on product packaging.[1]

For businesses selling into the world's fifth-largest economy, the ambiguity of digital compliance is ending. Under the proposed framework, e-commerce platforms and digital applications must display a Proposition 65 warning online before the customer completes their purchase. Crucially, this digital notice does not replace the physical label; the product must also carry a warning on its packaging when delivered.[2][4]

This dual-warning mandate codifies what enforcers have long argued but regulations left vague. Previously, some retailers assumed an online warning exempted them from physical labeling, or vice versa. The Omnibus 2026 amendments convert this dual-track approach into an express regulatory mandate, forcing large marketplaces to ensure every shipped product carries a physical tag even if the buyer acknowledged the risk at checkout.[2]

To ease the physical labeling burden, the OEHHA is officially bringing Proposition 65 into the smartphone era. The amendments formally recognize QR codes as a valid method for delivering safe harbor warnings on labels, signs, and shelf tags. While some companies had experimented with QR codes under general electronic warning provisions, the new rules provide explicit regulatory protection for the practice.[1]

However, the QR code option comes with strict formatting requirements. A business cannot simply print a blank QR code; it must be accompanied by the text, "Proposition 65 Warning for [name of one or more chemicals]. For more information, scan the QR code." This ensures consumers immediately know a specific chemical is present before they decide to scan for further details, maintaining the agency's push for explicit chemical identification.[2]

The Omnibus 2026 package also closes a significant loophole for the food and supplement industries regarding "naturally occurring" chemicals. Under current rules, businesses can sometimes avoid warnings if a chemical occurs naturally in the environment. The new draft clarifies that extracting or concentrating a substance from a natural source—such as a plant extract—constitutes "human activity," triggering the warning requirement even if the chemical's registry number remains unchanged.[1][4]

This clarification means that food brands relying on concentrated natural ingredients will need to re-evaluate their product lines. If an extraction process concentrates a listed chemical above the safe harbor threshold, the product will require a Proposition 65 warning, regardless of its organic origins.[3][4]

The proposed amendments are currently in the pre-rulemaking stage, with the OEHHA accepting public comments through September 7, 2026. While these rules do not yet create binding requirements, compliance experts advise e-commerce sellers to treat the Omnibus 2026 initiative as a clear regulatory signal. Brands are urged to audit their digital checkout flows and packaging designs now, ensuring they have the infrastructure to support both online disclosures and QR-based physical labels when the rules take effect.[1][3]