Sewage is a liquid waste which has water as its largest component along with various types of impurities like waste water from houses, offices, factories, hospitals etc., is called sewage. It has a complex and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes. Discharging untreated sewage into rivers or seas will pollute the water resources. Contaminated water is dangerous for aquatic plants and animals. It also spread many diseases like cholera, typhoid, polio meningitis, malaria, dengue etc.

1. All the waste water released by homes, industries, hospitals, offices and other users are collectively called Sewage. 

2. Sewage is a liquid waste. 

3. Most of it is water, which has dissolved and suspended impurities, disease-causing bacteria and other microbes. These impurities are called contaminants. 

4. If this is discharged into canals, it causes a lot of harm to animals, human beings, aquatic animals and plants if this water used.

Sewage is a liquid waste which has water as its largest component along with various types of impurities like waste water from houses, offices, factories, hospitals etc., is called sewage. It has a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes. Discharging untreated sewage into rivers or seas will pollute the water resources. Contaminated water is dangerous for aquatic plants and animals. It also spread many diseases like cholera, typhoid, polio, meningitis, malaria, dengue etc.