also known as white water, is caused by air bubbles in the water.
It is completely harmless.
It usually happens when it is very cold outside because the solubility
of air in water increases as water pressure increases and/or water
holds more air than warm water.
In the winter,
water travels from the reservoir which is very cold and warms up
during its travel to your tap. The
air that is present is no longer soluble, and comes out of solution.
once water from our reservoir enters the transmission and distribution
pipes, the water is pressurized. Water under pressure holds more
air than water that is not pressurized.
water comes out of your tap, the water is no longer under pressure
and the air comes out of solution as bubbles (similar to a carbonated
soft drink). The best thing to do is let it sit in an open container
until the bubbles naturally disappear.