The water from our taps is coming out brown/cloudy sometimes — what causes it and should I worry?
Occasionally the water from our taps looks brown or rusty, and sometimes cloudy/white before it clears.
- What causes discoloured tap water — is brown different from cloudy, and does it mean the pipes, the tank or the water heater?
- When is it harmless and when should I actually worry or stop drinking it?
Trying to work out the cause before calling a plumber.
3 answers
Short answer: the COLOUR tells you a lot, and cloudy vs brown are two completely different things. CLOUDY/WHITE/milky water that clears from the BOTTOM UP when you let a glass stand is just dissolved AIR — totally harmless, common after supply work or in cooler water, and not a quality problem. BROWN/YELLOW/RUSTY water is sediment or rust/iron, and where it comes from is diagnosable by WHICH taps and WHEN: (a) if it's ALL taps (cold + hot) and usually after a water interruption, mains work or a big draw, it's disturbed sediment/rust in the SUPPLY or the building's storage TANK settling out — running the taps for a few minutes usually clears it; (b) if it's mainly the HOT tap, suspect the WATER HEATER — a rusting/sediment-laden tank (very common with our hard water); (c) if it's ONE tap or comes with black bits, it's often a local issue — a corroding pipe section or a degrading flexible-hose/washer. Most UAE homes are fed from a stored tank, so a tank that hasn't been cleaned on schedule is a frequent cause of intermittent brown water. When to worry: a one-off that clears after running the tap is usually fine; PERSISTENT brown from all taps, or any water you're unsure about, means don't drink it and get the tank/supply checked. Discoloured water is worth diagnosing, not ignoring.
Cloudy vs brown (they're different): - Cloudy/white, clears bottom-up: dissolved air — harmless, no action needed. - Brown/rusty/yellow: sediment or rust/iron — diagnosable (below).
Where brown water comes from: - All taps, after supply work/interruption: disturbed sediment/rust in the supply or storage tank — run taps a few minutes to clear. - Mainly HOT tap: the water heater — rusting/sediment tank (common in hard water; see water-heater sediment). - One tap / black specks: local corroding pipe or a degrading hose/washer. - Stored-tank homes: an un-cleaned storage tank is a frequent cause here (DM recommends regular tank cleaning).
When to worry: - One-off that clears after running the tap = usually fine. - Persistent brown from all taps, or you're unsure = don't drink it, get the tank/supply/heater checked.
Common mistake: ignoring recurring brown water or assuming it's always the mains — if it's only hot it's the heater, if it's all taps it's often the tank. Narrow it by which taps + timing, and let a licensed plumber check the tank/heater/pipework. Anyone traced theirs to the tank or the heater?
Ours was brown only on the hot side and it turned out to be the water heater tank rusting/full of sediment — flushing and eventually replacing it sorted it. The cold ran clear the whole time, which the plumber said was the giveaway that it was the heater, not the supply. Good tip about letting a glass stand: our cloudy water cleared from the bottom up and was just air, nothing to worry about. The which-taps test really does narrow it down fast. Don't ignore persistent brown though, we left it too long and the heater was pretty far gone.
We get occasional brown water across all taps after the building does work on the supply, and running the taps for a few minutes clears it every time — classic disturbed sediment. But we also had a spell of persistent discolouration that turned out to be the storage tank needing a clean; once it was cleaned properly it stopped. So the stored-tank angle is real here, get it cleaned on schedule. Cloudy/white we stopped worrying about once we realised it's just air. Agree you shouldn't drink persistently discoloured water until it's checked, better safe than sorry with something you're drinking.
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