Drinking tap water can appear cloudy or milky due to two primary reasons. Most commonly, cloudiness is caused by tiny, harmless pressurized air bubbles trapped inside the water distribution mains or private pressure tanks; when the faucet opens, pressure drops and air escapes as micro-bubbles. Less commonly, cloudy water indicates suspended fine silt, dirt particles, or mineral sediment stirred up by municipal hydrant flushing, main line repairs, or corroding residential plumbing pipes. Verification: Pour the water into a clear glass and let it rest for two minutes to see if the cloudiness vanishes upward.
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