Drinking water standards WHO

People can live without love but no one can live without water. A water molecule has two parts of hydrogen and one part of the oxygen atom. H2O is the formula of water.

Water is necessary for our bodies. We need to drink a lot of water daily. Water should be pure for drinking, otherwise, many diseases can occur in our bodies.

Therefore, there are some international standards for drinking water which are as follows: 

 International standards for drinking water class 11:-

International standards for drinking water are as follows-

 1. pH ( power of Hydrogen) Value:-

According to International Standards, the drinking water value should be between 5.5 - 9.5.

If the pH value of water is less than 5.5 (the water is more acidic), the solubility of metal ions in the water will increase. Due to this, the water will become harmful to our health. 

2. Fluoride:-

The amount of fluoride dissolved in drinking water should not exceed one ppm. i.e. 1 mg dm-3.

Often a limited amount of fluoride is added to the water to prevent tooth decay. If the amount of fluoride in water is more than its normal value, it makes the water toxic and harmful to teeth and bones.

3. Lead:- 

According to International Standards, the lead concentration in drinking water should not exceed 50 ppb (parts per billion).

An excess of lead ions in water can lead to lead poisoning, which affects the kidneys, liver, and brain.

4. Other metals:- 

According to international standards, the maximum concentration of common metals in drinking water is as follows :

Metal	Maximum concentration level in ( ppm or dm-3)
MetalZn	Maximum concentration level in ( ppm or dm-3)5.0
MetalFe	Maximum concentration level in ( ppm or dm-3)0.2
MetalMn	Maximum concentration level in ( ppm or dm-3)0.05
MetalCu	Maximum concentration level in ( ppm or dm-3)3.0
MetalCd	Maximum concentration level in ( ppm or dm-3)0.005
MetalAl	Maximum concentration level in ( ppm or dm-3)0.2

5.Sulfate:-

The concentration of sulfate in drinking water should not exceed 500 ppm. Because of its high concentration, Laxative Effect can occur.

6.Nitrate:-

The concentration of nitrate in drinking water should not exceed 50 ppm. Due to its excess, methemoglobinemia or blue-baby syndrome can occur.