California’s Proposition 65 (Prop 65) asks businesses to warn shoppers about exposure to listed chemicals. For online sales, the warning has to reach the shopper before the purchase, for example on the product page.

Sim0 Prop 65 Warnings for WooCommerce adds a Prop 65 tab to the product editor. You pick what the warning is for and type the chemical names, and the plugin writes the warning text from the safe-harbor wording in 27 CCR 25603 (and 27 CCR 25607.2 for food). The warning then shows on the product page with the signal word, the warning triangle and a link to www.P65Warnings.ca.gov.

Quick start

Go to WooCommerce > Settings > Products > Prop 65 and choose your signal word, default warning form and where the warning shows.
Edit a product and open the Prop 65 tab in the Product data box.
Set Prop 65 warning to Show a warning.
Choose cancer, reproductive harm, or both, and enter at least one chemical name, for example lead.
Update the product. The Saved warning preview under the fields shows the exact text shoppers will see.

Per product

Turn the warning on or off for each product
Consumer product or food (food and dietary supplements get the food wording, the www.P65Warnings.ca.gov/food link and no symbol)
Cancer, reproductive harm, or both (different chemicals or one chemical listed for both)
Short form, full-length form, or the old short form for products made and labeled before January 1, 2028
Optional custom warning text, for wording your supplier or advisor gave you
For a variable product, one warning covers all of its variations

Store settings

Signal word: WARNING:, CA WARNING: or CALIFORNIA WARNING:
Default warning form and short form wording (“Cancer risk from exposure to…” or “Can expose you to…”)
Show the warning below the price or below the add to cart button
Yellow or black and white warning triangle
Opt-in clean uninstall

Other details

Works with classic themes and with block themes that use the WooCommerce single product template
Declares compatibility with High-Performance Order Storage (HPOS) and the Cart and Checkout blocks
No tracking, no ads, no external requests. Translation ready (the warning wording itself stays in English, as written in the regulation)
Developer filters: sim0p65_product_warning_data, sim0p65_warning and sim0p65_settings

Important

This plugin helps you display Prop 65 warnings. It is not legal advice. It does not decide whether a product needs a warning, which chemicals to name, or whether the warning also has to be on the product label or packaging. Check your obligations with a qualified advisor.