Why Is My Tap Water Cloudy or White? Causes and Simple Fixes
Cloudy or milky-white tap water is almost always caused by harmless air bubbles, and it clears on its own within a minute. Pour a glass and watch it: if it turns clear from the bottom up, it’s just air. If the cloudiness lingers or comes with grit or colour, that points to sediment or a plumbing issue worth checking.
The most common cause: air bubbles
Water is delivered under pressure, and cold water holds more dissolved air. When it leaves your tap and the pressure drops, that air comes out of solution as thousands of tiny bubbles — just like opening a fizzy drink. The water looks milky for a few seconds, then clears from the bottom up as the bubbles rise. As the USGS explains, this is completely harmless.
The glass test
Want to be sure? Fill a clear glass and set it on the bench:
- Clears from the bottom up within a minute → just air. Safe.
- Stays cloudy or leaves particles at the bottom → likely sediment.
- Has a tinge of colour → could be rust or mineral disturbance, often after mains work.
Other causes worth knowing
- Recent plumbing or mains work: air gets into the pipes and clears after running the tap.
- Sediment and rust: older pipes or hot-water systems can shed particles — more common in hot water.
- Hard-water minerals: can give a faint haze in some areas.
If cloudiness is persistent, run the cold tap for a minute or two; if it doesn’t clear, contact your water authority.
Where a tap filter fits in
Filtering is optional rather than essential for safety on Australian mains water. If you do want to cut chlorine taste, sediment and microplastics, a point-of-use activated-carbon filter is one simple, low-cost option. PureFlow is one such tap-mounted filter, but the right choice depends on your water and your household — it is worth comparing the options and deciding what suits you.
Frequently asked questions
Is cloudy tap water safe to drink?
If it’s caused by air (clears within a minute), yes. Persistent cloudiness or particles should be checked. See is Australian tap water safe.
Why is only my hot water cloudy?
Hot-water systems release more air and can shed sediment, so milky hot water is common and usually harmless.
Why does my water look cloudy in winter?
Cold water holds more dissolved air, so the bubble effect is more noticeable in colder months.