Carcinogens are substances that have been known to contribute to cancer production when exposed to living tissue. With several carcinogens found in water sources, including benzene, vinyl chloride, and arsenic, exposure to these substances can occur through ingestion of contaminated water, inhalation of vapours, or absorption through the skin during bathing or swimming. Long term exposure to carcinogens in water sources is known to increase the risk of cancer development in humans, effecting their overall health and well-being. It is important to ensure that water sources are regularly tested for carcinogens and that the appropriate treatments are used to remove or reduce their levels in drinking water.