Halon 1011 is a fire extinguishing agent that can enter water through industrial discharge or firefighting. It depletes ozone and may damage the nervous system.

Halon 1011, also known as bromochloromethane, is a man-made chemical primarily used in fire suppression systems. It's highly effective but environmentally harmful, contributing to ozone depletion. This led to its phase-out under the Montreal Protocol. Water contamination typically occurs through industrial discharge or firefighting runoff. Detection involves gas chromatography. While its use is now restricted, legacy systems and stockpiles still pose environmental risks. Proper disposal and alternative fire suppressants are crucial to minimize its impact on water sources and ecosystems.