Dicamba is an herbicide used on crops that can enter water through agricultural runoff. It may disrupt hormone function and is an emerging concern in drinking water.

Dicamba, introduced in 1967, is a widely used herbicide for corn and soybean crops. It can enter water sources through agricultural runoff and spray drift during application. The chemical is typically measured in parts per billion (ppb) in water samples. Concerns about dicamba have grown with the increased planting of dicamba-resistant crops, leading to more widespread use. While its full impact on human health is still being studied, researchers are investigating its potential to disrupt hormone function.