Cloudy water can be startling — a glass of white or foggy water looks concerning, but in most cases, it’s harmless. The cause? Tiny air bubbles.
City water is pressurized and moves quickly through mains and building pipes. Changes in pressure — when hydrants are used, pumps kick on, or taps start suddenly — can trap air in the water. When you fill a glass, the pressure drop allows bubbles to rise, creating a cloudy appearance. Within a few minutes, the water clears from the bottom up as the bubbles dissipate.
Other minor contributors can include sediment stirred up in pipes during maintenance or low usage periods. Running the tap for a short time usually clears the water and restores clarity.
TapAware.org emphasizes that visual changes don’t always indicate safety issues. Observing, running water briefly, and checking other taps in the home can help you determine whether the cloudy water is temporary or persistent.
