Question

how can sewage cause water pollution?

Answer 1

Heyyy....
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The major contributor to aquatic pollution in estuary and coastal areas is human sewage from population centres that is discharged from waste treatment plants. ... Sewage may affect the marine environment in three main ways, through oxygen depletion, causing disease, and by nutrient enrichment...
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hope it helps u

Answer 2

Waste sewages are thrown in water bodies like river lake etc due to which the waste dust particles mixed with the water bodies and hence causes water pollution