N-Nitrosodimethylamine is a synthetic chemical formed as a byproduct of industrial processes. It can contaminate water, food, and air. This potent carcinogen is strictly regulated.

N-Nitrosodimethylamine (NDMA) is primarily formed as an unintended byproduct of industrial processes and water treatment. It can enter drinking water through contamination of water sources or formation during chlorination. NDMA is measured in parts per trillion due to its potency. Common sources include rubber manufacturing and rocket fuel production. Its carcinogenic nature has led to strict regulations. Removing NDMA from water is challenging, often requiring advanced treatment methods like reverse osmosis or UV light exposure.