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I want to know why water appears cloudy in a glass and then it clears up. (Utilities - Water Treatment)
Cloudiness in water that disappears in a few minutes is dissolved air in the water. When cold water from the water main enters a warm building, the air escaping from the water makes the water look cloudy or milky. The cloudiness usually occurs more often in the winter than in the summer because cold water can hold more dissolved air than warm water.
If the water appears cloudy at only one faucet, it has to do with the building plumbing, not the city water supply. If the faucet you are using has an aerator, the aerator is adding a lot of air to the water, causing it be appear cloudy.
Water may appear cloudy after you have not used the tap for a few hours. This is because the water has been motionless in the plumbing for more than a few hours, it has warmed up a few degrees. Even a few degrees will warm the water enough so air escapes quickly from the water. Run the tap water three to five minutes so fresh water from the water main is coming into the house.
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