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Table 3 Standard of surface water quality classification (WHO, 1996)

From: Assessment of spatio-temporal variations of selected water quality parameters of Lake Ziway, Ethiopia using multivariate techniques

Comprehensive pollution index (P) Water quality level
≤< 0.20 I cleanness
0.20 to 0.40 II sub-cleanness
0.41to1.00 III slight pollution
1.01 to 2.00 IV moderate pollution
 ≥ 2.01 V sever pollution