Skip to content
Tech News
← Back to articles

A Prop 65 Crash Course: What You Need to Know (2026)

read original more articles
Why This Matters

Proposition 65 is a California law aimed at informing consumers about potential chemical exposures that could cause cancer or reproductive harm. While it often results in warnings on various products, it does not ban chemicals but encourages informed decision-making. Understanding this law helps consumers navigate product labels and assess risks more effectively.

Key Takeaways

My first encounter with a Prop 65 warning was on the back of my TV.

I was selling it on Facebook Marketplace, and when the buyer arrived to pick it up, he spotted a warning I had never noticed. “California Proposition 65 Warning: This product contains chemicals known to the state of California to cause cancer and birth defects or reproductive harm.” Neither of us had seen such a label before, and for a moment, he didn’t want the TV anymore. We did what anyone would do in this situation: We Googled it. He ended up taking the TV. I kept Googling.

California’s Proposition 65, officially called the Safe Drinking Water and Toxic Enforcement Act, applies to a dizzying range of products, from food and cosmetics to electronics and household goods. Passed in 1986, the law turns 40 this year, yet that ominous little label still confuses the average consumer.

So, should you steer clear of all products with a Prop 65 warning? Not necessarily. Here’s what you need to know before you panic-buy a new TV.

Courtesy of Stephen Osman/Getty Images

Proposition 65, Explained

In November 1986, California voters approved Proposition 65 by a landslide margin of about 63 percent to 37 percent. It’s a right-to-know law, meant to inform Californians about potential exposure to chemicals that may cause cancer or reproductive harm over a lifetime.

It doesn’t ban those chemicals; instead, it requires businesses to provide a warning when their products could expose people to a listed chemical at levels above specific thresholds.

“At that time, it was part of a broader effort to address a growing concern that the public had about toxic chemical exposure,” says Megan Schwarzman, environmental health scientist at UC Berkeley’s School of Public Health.

The idea is that consumers can use that information to make their own decisions. A warning might prompt someone to choose an alternative, use a product less frequently, or take other steps to reduce their exposure. Prop 65 also gives businesses an incentive to reformulate products or change manufacturing practices to avoid issuing a warning that may deter customers.

... continue reading