2,4-D is a widely used herbicide that can enter drinking water through agricultural runoff. It may cause kidney and liver damage if consumed in high amounts over time.

2,4-D, introduced in the 1940s, is one of the most common herbicides used in agriculture and lawn care. It can enter water sources through agricultural runoff, improper disposal, and spray drift. The EPA measures 2,4-D in parts per billion (ppb) and sets a maximum contaminant level to protect public health. While effective for weed control, long-term exposure to high levels may pose health risks, prompting ongoing research and regulation.