Tap water turns cloudy or milky primarily due to one of two common reasons. Most frequently, cloudiness is caused by tiny, harmless pressurized air bubbles trapped inside your home's plumbing system or municipal water mains; when you open the faucet, the sudden drop in pressure forces dissolved air out of solution as microscopic 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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