Table 1: Comparison of various drinking water guidelines.

Parameters LIBNOR EU standards WHO standards pH 6.5–8.5 6.5–9.0 No guideline Total Dissolved Solids (mg/L) 500 No guideline No guideline Electrical Conductivity (μS/cm at 20°C) No guideline 2,500 No guideline Chloride (mg/L) 200 250 No guideline Dissolved Oxygen (mg/L) No guideline No guideline No guideline Ammonia (mg/L) No guideline 0.5 No guideline Nitrate (mg/L) 45 50 50 Nitrite (mg/L) 0.05 0.5 3.0 Phosphate (mg/L) 1.35 No guideline 5.0 Sulphate (mg/L) 250 250 500