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What is a P65 Warning?

Published April 17, 2025 by Katie Leave a Comment

Have you recently purchased a product that came with a P65 Warning? Most P65 labels will say, “This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm.”

When you see a P65 label, it should cause concern. In this blog, we’ll cover what a P65 warning is, why you are seeing this label, and more resources to make more informed decisions about the products you purchase.

example of california proposition p65 warning label

What is a P65?

Proposition 65, or Prop 65, became law in California in 1986. This law requires California to publish a list of chemicals known to cause cancer, birth defects, or reproductive harm annually and requires businesses to provide these warnings to Californians.

If you buy a product or food item with a P65 warning label and don’t live in California, the product is likely sold to Californians and must have a P65 warning label. You may see the label on the packaging, product, or website where the product is sold.

What Chemicals are on the Prop 65 List?

The Proposition 65 list features a diverse array of chemicals. It includes both naturally occurring and synthetic varieties. The substances on the list may be additives or ingredients in various products. Here are a few examples:

  • Pesticides for agriculture and gardening products.
  • Cleaning Supplies and Personal Care Items
  • Certain Foods and Drugs with preservatives or active ingredients.
  • Dyes and Solvents used for manufacturing and artistic applications.

Additionally, many listed chemicals are critical in manufacturing and construction; some are byproducts of chemical reactions. The comprehensive P65 list is vital for maintaining awareness and safety standards in California.

P65 Chemicals List

P65 Enforcement

Several entities enforce Proposition 65. The California Attorney General’s Office ensures businesses adhere to the law’s regulations.

Private individuals and organizations acting in the public interest may also initiate legal action if they believe a violation has occurred.

Penalties for Violating P65

Businesses that violate Proposition 65 may face significant financial repercussions.

In addition to financial penalties, businesses can also face legal action requiring them to comply. This can incur attorney fees and court costs, further straining a company’s resources.

Businesses should invest in ensuring compliance with Proposition 65, especially if they sell to Californians. Regular reviews of products and processes, alongside clear labeling, can mitigate the risk of violations or costly penalties.

person shopping looking at the label of a product for p65 warning

Prop65 Resources

The P65 website is operated by the California Office of Environmental Health Hazard Assessment and provides information to the public about chemicals, products, and locations associated with P65 warnings.

California must update and publish a list of these chemicals each year. At this moment, approximately 900 chemicals are on the list.

Proposition 65 warnings are not limited to physical goods and foods; it also prohibits California businesses from knowingly discharging significant amounts of chemicals into drinking water sources.

What you need to know: P65 warnings allow Californians to make informed decisions about their exposure to chemicals that can cause cancer, birth defects, or reproductive harm.

 

Want to do more research about P65 warnings? Here are a few resources that might be helpful to you:

  • What You Should Know About P65 Warnings
  • PEScience: California Proposition 65 FAQ
  • Loma Linda University Health: California’s cancer warnings: What are the real risks?
  • Cancer.org: Cancer Warning Labels Based on California’s Proposition 65
  • Newsweek: Here’s Why Everything Gives You Cancer in California

About the Author

  • Katie

    With over seven years of experience in the filtration industry, I am dedicated to making complex filtration concepts simple. As a passionate content creator, I have cultivated in-depth expertise, sharing insights and practical advice on all things filtration. I am committed to providing valuable, easy-to-understand content for anyone interested in healthier air and water solutions.

    View all posts

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