Beside its natural toxicity, nitrate is also an environmental concern as a potential source of nutrient enrichment of waters. High levels of nitrate in water typically indicate pollution seeping in from septic tanks, livestock wastes, fertilizers, municipal landfills, and nonpoint sources such as runoff from agricultural area. When swollowed, may lead to vomitting, headaches and other poisoning manifestations By their very nature, most pesticides create some risk of harm to humans, animals, or the environment because they are designed to kill or otherwise adversely affect living organisms. These contaminants are generally very persistent in the environment and may accumulate in fish, shellfish, and wildlife to levels that pose risks to human health and the environment. They major source of pesticides residues in water are agricultural activities.
Many household products are also pesticides.
They can affect you when breathed or passed through skin. Widely used in industrial processes as reactant or catalysers. These are introduced into waterways from spills, industrial discharges, improper disposals, leaking automobiles, runoff from city streets, and leaking tanks and landfills. Normally not found at high concentration in water, they nevertheless tend to concentrate in component such as clay sediments and living organism like mollusks and shellfish. Being not degradable, they persist in the environment, causing long term pollution no Cyanides Cyanide affects the ability of our tissues to use oxygen.