I'm looking for surface water quality data for India. Intended purpose is a thematic map on state or district level, educational purpose. Does anybody have any leads as to where I can find data?
Hans, you might use watersheds (hydrological drainage area) as your mapping unit, and rate them by the average level.
To put it into perspective, you might use India's water quality objectives but if you have too much trouble getting these, you could use some more universal levels, especially for physical and chemical properties (BOD, turbidity, pH, temperature, electrical conductivity).
Good luck with the data hunt!