Table 1: Comparison of various drinking water guidelines.

ParametersLIBNOREU standardsWHO standards

pH6.5–8.56.5–9.0No guideline
Total Dissolved Solids (mg/L)500No guidelineNo guideline
Electrical Conductivity (μS/cm at 20°C)No guideline2,500No guideline
Chloride (mg/L)200250No guideline
Dissolved Oxygen (mg/L)No guidelineNo guidelineNo guideline
Ammonia (mg/L)No guideline0.5No guideline
Nitrate (mg/L)455050
Nitrite (mg/L)0.050.53.0
Phosphate (mg/L)1.35No guideline5.0
Sulphate (mg/L)250250500