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Need For Sewer System
Each time you flush the toilet or you wash something down the sink's drain, you create sewage (known as waste water). There are three main reasons why waste water cannot be directly released into the environment. First of all, it creates bad odour, secondly it contains harmful bacteria which cause health hazards and thirdly, it contains suspended solids and chemicals that affect the environment. That is why communities build waste water treatment plants and enforce laws.