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Table 2

Standards, weights and relative weights for each water quality parameter

ContaminantWHO standard (mg/L)aEPA standard (mg/L)bStandard used in the study (Si)Weight (wi)Relative weights (Wi)
TDS 600 500 500 0.1724 
Cl 250 250 250 0.1724 
Fe 0.3 0.3 0.3 0.1724 
Mn 0.1 0.05 0.05 0.1724 
Na 200 – 200 0.1379 
SO4 250 250 250 0.1724 
      
ContaminantWHO standard (mg/L)aEPA standard (mg/L)bStandard used in the study (Si)Weight (wi)Relative weights (Wi)
TDS 600 500 500 0.1724 
Cl 250 250 250 0.1724 
Fe 0.3 0.3 0.3 0.1724 
Mn 0.1 0.05 0.05 0.1724 
Na 200 – 200 0.1379 
SO4 250 250 250 0.1724 
      

aNo health-based guideline value is set for these parameters except Mn. For Mn, the health-based value is 0.4 mg/L.

bAll standards presented here are secondary standards.

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