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CBSE Class 7 Answered

How can contamination of drinking water occur from sewage even in a covered drainage system?  
Asked by gspublicschool | 06 Mar, 2019, 10:10: AM
answered-by-expert Expert Answer

Contamination of drinking water sources by sewage can occur from raw sewage overflow, septic tanks, leaking sewer lines, and partially treated wastewater. Sewage itself is a complex mixture and can contain many types of contaminants. Major contamination of water resources arises from the contamination by bacteria, nitrates, metals, trace quantities of toxic materials, and salts.

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