Compounds that are not naturally found in water at the given concentrations and that cause diseases in organisms that ingest or absorb them. Toxic water pollutants are substances that are considered detrimental to the environment and produce unwanted events such as deaths, birth defects, and illnesses within organisms. Pollutants incorporate contamination as a result of chemical wastes, organic substances, heavy metals, domestic wastes, food processing waste, herbicides, and insecticides.