Waterborne carcinogens can originate from various sources, including industrial waste, agricultural runoff, and natural sources. Common carcinogens found in water include Polychlorinated Biphenyls (PCBs), Atrazine, Volatile Organic Compounds (VOCs), Radon, and Trihalomethanes (THMs). These substances can increase the risk of developing various types of cancer, including bladder, liver, and kidney cancers.