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Table 2 Water quality classification for drinking purposes based on the WQI values (Boateng et al. 2016)

From: An application of Water Quality Index (WQI) and multivariate statistics to evaluate the water quality around Maddhapara Granite Mining Industrial Area, Dinajpur, Bangladesh

Range Type of water
<50 Excellent
50–100 Good
100.1–200 Poor
200.1–300 Very poor
>300 Unsuitable