Antimony is a metal from plumbing fittings and industrial alloy production. Long-term exposure can damage organs and reduce lifespan. It's regulated in drinking water.

Antimony enters drinking water primarily through corrosion of plumbing materials and industrial discharge. It's measured in parts per billion (ppb) using laboratory analysis. The EPA has set a maximum contaminant level of 6 ppb for public water systems. While antimony occurs naturally in small amounts, human activities like mining and manufacturing significantly increase its presence in the environment. Regular testing and proper water treatment are essential to minimize exposure to this regulated contaminant.