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Choosing variables and objectives. Sixteen parameters have been selected as variables from The Egyptian Higher Committee of Water guidelines for drinking water quality (1995) to generate the Canadian Council of Ministers of the Environment Water Quality Index (CCME WQI). Those variables (i.e. physicochemical properties of groundwater samples) and objective (i.e. maximum permissible values) are listed in Table 8.

Table 8

Selected objective based on the Egyptian High Committee of Water (1995)

ObjectiveValue
pH 6.5–9.2 
EC (μS/cm) 1,200 
TDS (mg/l) 200 
Hardness (mg/l) 500 
Ca (mg/l) 150 
Mg (mg/l) 200 
Na (mg/l) 325 
SO4 (mg/l) 500 
Cl (mg/l) 0.5 
B (mg/l) 0.001 
Cd (mg/l) 0.01 
Cu (mg/l) 0.2 
Mn (mg/l) 0.02 
Ni (mg/l) 0.01 
Pb (mg/l) 0.01 
Zn (mg/l) 500 
Fe (mg/l) 0.5 
ObjectiveValue
pH 6.5–9.2 
EC (μS/cm) 1,200 
TDS (mg/l) 200 
Hardness (mg/l) 500 
Ca (mg/l) 150 
Mg (mg/l) 200 
Na (mg/l) 325 
SO4 (mg/l) 500 
Cl (mg/l) 0.5 
B (mg/l) 0.001 
Cd (mg/l) 0.01 
Cu (mg/l) 0.2 
Mn (mg/l) 0.02 
Ni (mg/l) 0.01 
Pb (mg/l) 0.01 
Zn (mg/l) 500 
Fe (mg/l) 0.5 

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