It’s caused by air becoming trapped in the pipes, usually when repair work has been carried out.

This is known as aerated water and it’s safe to continue drinking. A glass of aerated water will clear from the bottom upwards in about 30 seconds. Aerated water will normally clear quickly by running the cold kitchen tap for a short time.

It’s quite common for water from hot taps to be white or cloudy and this is usually caused by your boiler. 

If your water is any other colour visit our discoloured water page for further information.