Cloudy or milky water emerging from a tap is often caused by dissolved air. This phenomenon occurs when water is pressurized within the pipes, allowing air to dissolve. When the water exits the faucet and the pressure decreases, the dissolved air is released, forming tiny bubbles that give the water a cloudy appearance. A simple test involves filling a clear glass with the water. If the cloudiness dissipates from the bottom up within a few minutes, it is likely due to air.
Understanding the cause of this cloudiness is important for homeowners and water system operators. While dissolved air is generally harmless, persistent or unusual discoloration may indicate more serious underlying issues related to water quality or plumbing infrastructure. Recognizing the difference between air bubbles and other contaminants can prevent unnecessary concern and facilitate appropriate action when necessary. In the past, more primitive water systems were less prone to this issue due to lower pressures, but modern pressurized systems make it a common occurrence.
