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The CCME WQI has been calculated and compared with the classification of WQIs, Table 9, to evaluate the suitability of the studied groundwater for drinking purposes. A water quality map has been created using GIS, as shown in Figure 5, showing that the groundwater quality of the study area falls in two categories:
Figure 5

Groundwater quality map for the study area using Super GIS.

Figure 5

Groundwater quality map for the study area using Super GIS.

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Table 9

Categorization of the WQI CCME Method (Canadian Council of Ministers of the Environment 2001)

CategorizationIndex valueWater quality
Excellent 95–100 Virtual absence of threat or impairment 
Good 80–94 Minor degree of threat or impairment 
Fair 65–79 Occasionally threatened or impaired 
Marginal 45–64 Frequently threatened or impaired 
Poor 0–44 Almost always threatened or impaired 
CategorizationIndex valueWater quality
Excellent 95–100 Virtual absence of threat or impairment 
Good 80–94 Minor degree of threat or impairment 
Fair 65–79 Occasionally threatened or impaired 
Marginal 45–64 Frequently threatened or impaired 
Poor 0–44 Almost always threatened or impaired 
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