Water is pressurized, which is necessary to deliver it over long distances and the topography of our area to your home. Water under pressure holds more air than non-pressurized water. Once it comes out of your faucet, it is no longer under pressure and the air bubbles are released. As a result, bubbles of air can sometimes cause the water to appear cloudy or ‘milky’.
Cold water can exasperate this condition because cold water can hold more dissolved oxygen than warm water. When the faucet is turned on, the air that is present will dissolve after sitting for a short time.
Air can also result from certain system repairs or flushing. Air in water is not a public health concern.