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Minute one

The valve you cannot find is the one that costs you a floor.

Most of the damage in a domestic flood happens in the minutes spent looking for the valve. There are usually three places it hides, and two smaller valves that stop a single appliance without touching the house supply.

  1. 00Look where the supply entersBasement wall, crawl space, or a utility cupboard on the ground floor. It is on the street side of the house.
  2. 01If there is no basement, look outsideA box in the ground near the boundary, often with a concrete or plastic lid marked for water.
  3. 02For an appliance, use its own tapBehind the washing machine, under the sink, on the pipe feeding the heater. Faster and it leaves the rest of the house with water.
  4. 03Turn it, then open a low tapOpening a ground-floor tap drains what is left in the pipes instead of letting it find the hole.
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Two kinds of valve, and they behave differently

A quarter-turn lever moves ninety degrees and stops. A round gate handle needs several full turns and stops when it stops. If a round handle turns freely and nothing changes, the gate inside has failed, and the valve is decorative rather than functional.

A seized valve is common in houses where nobody has touched it in ten years. Forcing it can break the stem, which turns a leak into a leak with no shut-off at all.

This is the twenty-minute job worth doing on a dry afternoon: find it, turn it off, turn it on, and tell everyone in the house where it is.

A main water shut-off valve on a pipe against a basement wall with a hand reaching towards it
Where the supply enters the building. Find it once, on a dry day, rather than at two in the morning.

When the valve will not turn

Stop pulling on it. The alternatives are the street stop tap under the lid at the boundary, which needs a long key, and the water authority, who will close it for you in an emergency. Both are slower than your own valve and faster than a broken stem.

Meanwhile, work on the supply side of the problem: switch off the water heater, and close whatever local taps you can reach.

A woman crouching in a cupboard under a sink turning a quarter-turn valve on a copper pipe, lit by the phone torch in her other hand
The tap under the sink is a quarter turn and it is reachable. It stops one appliance and leaves the rest of the house in water.

What the clock is actually doing

EPA puts mold growth at 24 to 48 hours after materials get wet, counted from when they got wet rather than from when anyone noticed. That is the whole reason speed matters here, and why an hour spent hunting for a valve is an expensive hour.

Whose valve, whose decision

Not every reader can lawfully touch the same things.

  1. 01You own and live hereAll of it is yours. Locate the main valve today and label it.
    Ask them: while they are here, where is my shut-off and is it working?
  2. 02You own and let it outYour tenant needs to know where the valve is before an emergency, and telling them is on you.
    Ask them: can you check the main valve turns while you are here?
  3. 03You live in a flatThere is usually a valve for your unit and a riser valve that is not yours to close. Find yours; leave the riser to the building.
    Ask them: which valve serves only my unit?
  4. 04You rentClosing a local tap is reasonable. Report it in writing immediately either way.
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Where these figures come from

Published by someone other than us. Each link goes to their own words rather than to our summary of them.

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