Tap water that appears milky, hazy, or cloudy when first poured into a glass is almost always caused by tiny, harmless pressurized air bubbles trapped inside the water rather than chemical contamination. When water is subjected to high pressure inside municipal distribution mains or private well pressure tanks, it dissolves a large volume of air. When you open a faucet, the pressure drops instantly, causing the dissolved air to escape in the form of microscopic bubbles. Verification: Fill a clear glass with the cloudy water and let it sit undisturbed on a counter for one to two minutes; if the cloudiness clears from the bottom up, it is simply trapped air.
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