Water covers over 70 % of the earth. Water found on the surface of the earth like rivers and lakes, is referred to as surface water. The work trapped under the surface of the earth is referred to as groundwater.
Groundwater is believed to be very clean in the sense that they contain fewer impurities and can be used for cooking, drinking, and other while surface water is used for washing and also sometimes drinking and other activities like agriculture and also used in generating electricity.
Surface water is exposed to evaporation, while groundwater is not. The groundwater maintains a constant temperature while surface water temperature varies depending on the temperature of its surrounding.
Groundwater is free from pathogens like salmonella and malaria, while surface water contains things like waste, pesticides, insect ides, organic materials, etc. in their composition, surface water contains less salt content when compared to groundwater salt content.