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Table 1 Simplified rating table for the IMBP water quality indicators (Official Bulletin N°. 5062 of 5 December 2002)

From: River water quality index for Morocco using a fuzzy inference system

Sub-index DO BOD5 COD NH4+ TP FC Index
(mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (cfu/100 ml)1
Excellent >7 <3 <30 <=0.1 <=0.1 <=20 80 – 100
Good 7 – 5 3 – 5 30 – 35 0.1 – 0.5 0.1 – 0.3 20 – 2000 60 – 80
Average 5 – 3 5 – 10 35 – 40 0.5 – 2 0.3 – 0.5 2000 – 20000 40 – 60
Poor 3 – 1 10 – 25 40 – 80 2 – 8 0.5 – 3 >20000 20 – 40
Very poor <1 >25 >80 >8 >3 - 0 – 20
  1. 1cfu colony forming units.