Atrazine is a widely used herbicide that runs off from farms into water supplies. It disrupts hormones and can affect reproductive health in humans and animals.

Atrazine, introduced in 1958, remains one of the most common herbicides in the U.S., primarily used on corn crops. It enters drinking water sources through agricultural runoff. The EPA measures atrazine levels in parts per billion (ppb) and sets regulatory limits. While effective at controlling weeds, atrazine is controversial due to its potential as an endocrine disruptor. Some studies suggest it may affect reproductive health, but research findings vary, leading to ongoing debates about its safety and regulation.