Is this a plumbing emergency? Three categories qualify: water you cannot stop, sewage entering the home, and a leak reaching wiring. A common plumbing issue outside those three is a morning job, so shut off the water supply and assess the situation first.
Competitors answer this question with a list of scary examples. A list does not help at 11pm with an unfamiliar noise coming from a wall. A test does.
What is a plumbing emergency? The three-part test
What is considered a plumbing emergency?
Uncontrolled water you cannot shut off, contamination from sewage entering the home, or any leak reaching wiring, outlets or the panel.
- Uncontrolled water. A split supply line, a failed washing-machine hose, a cistern that will not stop filling, or a shut-off valve that will not close.
- Contamination. Sewage or grey water coming up through toilets, tubs, showers or floor drains.
- Water meeting power or gas. A leak above a panel or outlets, a soaked appliance, or a gas water heater that is leaking or venting badly.
Why “how bad it looks” is the wrong test
The instinct is to judge by drama. Drama is a poor predictor of cost. A hairline split spraying into a wall cavity produces no visible puddle and can destroy a ceiling overnight.
A toilet that overflows spectacularly across a tiled floor and then stops is a mop and twenty minutes. The difference is not volume in the moment, it is whether the water is still arriving and where it is going.
Two questions answer what is a plumbing emergency in practice: is water still entering the building, and is it landing on something absorbent or electrical?
One exception to the “it can wait” rule
Anything you cannot locate counts as still running. If you can hear water and cannot find it, or the meter is turning with every tap closed, treat it as active regardless of how little you can see.

