Picloram is an herbicide used to control weeds. It can enter drinking water through agricultural runoff. Long-term exposure may cause liver and kidney problems.

Picloram, introduced in the 1960s, is a persistent herbicide used to control broadleaf and woody plants. It can remain in soil and water for extended periods. The EPA regulates its use and sets drinking water standards, measuring it in parts per billion (ppb). Picloram typically enters water sources through agricultural runoff, improper disposal, or accidental spills. While effective for weed control, its persistence raises environmental concerns and necessitates careful monitoring in drinking water supplies.