if you fill a glass of water and it has a milky or cloudy appearance, this is nothing to be concerned about. this is due to lots of tiny air bubbles in the water which make it appear white.
to test if this is air, fill up a glass of water and leave it to stand. the water should clear from the bottom up.
air in the water is not harmful and will usually stop, if you run a tap for a couple of minutes. there may have been a burst water main in the area causing air to be trapped in the water.
sometimes a leaking tap washer can cause cloudy water. 