Environmental Systems Research

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

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