Accuracy of India's data on water quality: Thoughts invited

I am a student working on a report about the quantity and quality of data on India's water quality.  Most data sources seem to relate back to the Central Pollution Control Board.  I was wondering if anyone could provide me some information regarding the accuracy of this data? Or is some margin of error is to be assumed?

Divindy Grant
divindy.grant@oriel.ox.ac.uk

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