1 in 5 Mushroom Samples Had Pesticide Residues

Nearly 20% of edible mushroom samples tested positive for pesticide residues. Mushrooms. The food most people assume is clean because it grows in the dark.

What the Study Found

A 2026 study in the Journal of Agricultural and Food Chemistry tested mushrooms for 62 different pesticide residues. They found 15 pesticides across the samples. The most common was carbendazim, a fungicide, detected in 6.73% of all samples.

Most individual residues fell within "safe" limits for acute and chronic exposure. But here's the problem: the researchers also assessed cumulative dietary exposure. When you add up all the different pesticides in one mushroom, the combined risk goes up.

Why Mushrooms Matter

Mushrooms are porous. They absorb whatever is in their growing environment. And because they're fungi, they get treated with fungicides specifically designed to kill other fungi. The irony is hard to miss.

People eat mushrooms thinking they're making a healthy choice. And they are, mostly. But the pesticide residues tag along for the ride.

What You Can Do

Buy organic mushrooms when you can. Wash all mushrooms thoroughly before cooking (a quick wipe isn't enough). Better yet, try growing your own. Mushroom grow kits are cheap and pesticide-free.

Check out our non-toxic kitchen alternatives for cleaner food options.

Also see glass food containers for safer alternatives.

Source: Yao Q, Su D, Lin X, et al. (2026). J Agric Food Chem.