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Dangers of Water Pollution Water pollution occurs when people overload the water environment with wastes Its defined as contamination of streams lakes underground water bays or oceans by substances harmful to living things Water is necessary to life on earth All organisms contain it some drink it and some live in it Plants and animals require water that is moderately pure and they cannot survive if their water is loaded with toxic chemicals or harmful microorganisms If severe water pollution can kill large numbers of fish birds and other animals in some cases killing all members of a species in an affected area There are two types of water pollution point source and nonpoint source Point sources of pollution occur when harmful substances are put directly into a body of water such as an oil spill A nonpoint source is when pollutants enter the water indirectly through environmental changes for example fertilizer is carried into a stream by rain The major water pollutants are chemical biological and physical materials that lessen the water quality These are some of the most important ones Petroleum Products - oil and chemicals from oil are used for fuel lubrication plastics manufacturing and many other purposes The petroleum products get into water by accidental spills from ships tanker trucks and leaky underground storage tanks Many petroleum products are poisonous if ingested by animals and spilled oil damages the feathers of birds and the fur of animals often causing death Pesticides and Herbicides - chemicals used to kill unwanted animals and plants may be carried into streams by rainwater The chemicals in these that are not biodegradable can remain dangerous for a long time When an animal eats a plant thats been treated with certain non-degradable chemicals the chemicals are absorbed into the tissues or the organs of the animals When other animals feed on a contaminated animal the chemicals are passed up to them As it goes up through
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