Asbestos is a fibrous mineral that can contaminate drinking water sources in areas where it is present in the natural environment or where asbestos containing materials have been used in water supply infrastructure. These fibres can become airborne and inhaled, potentially leading to health problems such as lung cancer, mesothelioma and asbestosis. Related issues occur when drinking water is contaminated with asbestos which poses health risks if the fibres are ingested, although the risk is generally considered to be lower than the risk of inhalation, it is still something to factor in. The use of asbestos in water supply infrastructure has been banned in many countries, but in areas where it is still present, it is important to monitor and treat the water to remove or reduce any potential contamination.