Dear Mashid, yes it is ...
Published by Stephen ward
Dear Mashid, yes it is essential to follow standards for the Microbial Parameters to obtain good drinking Water Quality. WHO has developed the criteria as well the standards for each parameter.
I am sharing Standards given by WHO for drinking water :
You have mentioned some of the coliform group parameter, see here details for their identification, characteristic and standards
http://www.who.int/water_sanitation_health/dwq/gdwqvol32ed.pdf
If you require any other detail get back to me.
One more detailed case study for how to do biological parameters check for the area- http://libvolume4.xyz/environmental/btech/semester5/watertreatmenttechnology/physicalchemicalandbacteriologicalqualityofwater/physicalchemicalandbacteriologicalqualityofwaternotes2.pdf