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why is discharge of untreated sewage into water bodies not desirable

This is because it will contaminate the water bodies and harm the entire aquatic life. Different contaminants present in water will increase the algal growth in water bodies. Toxic substances will make water unfit for any use.
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At some places ,the local municipal bodies have laid a network of drainage pipes throughout the area.Through this poor network,the sewage is realsed into nearby water bodies.
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This is because it will contaminate the water bodies and harm the entire aquatic life. Different contaminants present in water will increase the algal growth in water bodies.A large amount of algae would decrese the amount of oxygen in the water . Upon their death , micro organisms will use oxygen for decomposition process. The level of dissolved oxygen falls and aquatic life is affected .
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