What factors decide the usability of water?

Dear student,
There are various chemical, physical and biological factors which affect/ determine the usability of water. These include presence of various nutrients/ minerals, chemicals (in forms of  fertilizers and insecticides, sewage) , physical like soil particles, temperature,  biological like  E.coli (bacteria). A change in the factor like temperature affect the aquatic organisms. Presence of  biological factors like E.coli coliforms in water provide  information about a  possible contamination of water with pathogens, failure of water treatment system. E.coli  belongs to class of  faecal coliform.  It indicates the presence of faecal matter from warm-blooded animals as found in their intestine. 

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