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Table 2 The values of WQI and suitable for use purpose

From: Assessment of surface water quality and monitoring in southern Vietnam using multicriteria statistical approaches

Values Water quality Suitable for use purpose
91–100 Very good Used good for domestic water supply purposes
76–90 Good Used good water quality suitable for use for domestic water supply but need suitable treatment measures
51–75 Average Used for irrigation and other equivalent purposes
26–50 Bad Used for navigation and other equivalent purposes
10–25 Poor Water is heavily tarnished, needing treatment measures
<  10 Very poor Contaminated water, and needs to be remedied and treated