Diquat is an herbicide used to control aquatic weeds. It can enter drinking water through agricultural runoff and is toxic if ingested in large amounts, causing organ damage.

Diquat is a fast-acting, non-selective herbicide primarily used to control aquatic weeds. It's a quaternary ammonium compound that disrupts plant cell membranes. Typically applied as a spray or injected into water bodies, diquat can persist in the environment for weeks to months. The EPA regulates diquat in drinking water, with a maximum contaminant level goal of 0.02 mg/L. Conventional water treatment methods like activated carbon filtration can effectively remove diquat from drinking water supplies.