When a pipe bursts or water starts flooding your home, every second counts. The first and most important step in any plumbing emergency is to turn off your water supply. Doing this quickly can prevent serious water damage and make things easier for your emergency plumber when they arrive.

At Mr24HourPlumber, we’ve helped countless homeowners across the Cotswolds control leaks and bursts before they become disasters. Here’s exactly how to locate and shut off your water supply safely.

Why Turning Off the Water Matters

A burst pipe can release hundreds of litres of water per hour, enough to ruin floors, furniture, and electrics. Shutting off your mains water supply stops the flow, giving you time to assess the situation and call a professional.

Even small leaks can escalate quickly if left running, so knowing where your stopcock is located is something every homeowner should do before an emergency happens.

Step 1: Locate Your Stopcock

Your stopcock (also called a stop valve or mains shut-off valve) controls the flow of water into your home.

Most homes in the UK have it:

  • Under the kitchen sink (most common location)
  • In a utility cupboard or downstairs toilet
  • Under the stairs
  • Where the water pipe enters the building, often near the front or back door

In some older or rural homes, it might be in a cellar, garage, or even outside near the boundary in a water meter box (you may need a stopcock key to access it).

Step 2: Turn Off the Valve

Once you’ve found the stopcock, turn it clockwise (right) to close it. You should feel some resistance, that’s normal.

Turn it slowly but firmly until it stops turning. This will shut off the mains water entering your property.

To check it’s worked, open a tap (preferably on the ground floor). The flow of water should quickly reduce and stop within seconds.

Step 3: Drain the System

After the mains supply is off, open all the taps in your home, starting upstairs and working down, to help drain any remaining water from the pipes. This relieves pressure and reduces further leaking.

If the leak is from your heating system, you may also need to switch off your boiler to prevent it from running dry.

Step 4: Isolate Specific Appliances (If Possible)

For smaller issues, such as a leaking washing machine or toilet, you can use isolation valves instead of the main stopcock.

These are small valves located on the pipes feeding individual appliances.

  • To close them, turn the screw slot a quarter turn so it’s perpendicular (across) to the pipe.
  • This stops water flowing to that specific fixture, allowing the rest of your home to stay supplied.

Step 5: Call an Emergency Plumber

Once you’ve stopped the water, it’s time to bring in the professionals. Contact Mr24HourPlumber, our emergency team is on call 24/7 across the Cotswolds.

We’ll quickly locate the cause of the leak, repair the damage, and get your system running safely again.

Step 6: Know Where to Turn It Back On

When the issue has been resolved, simply turn the stopcock anti-clockwise (left) to reopen the mains supply. Open a tap slowly to release any trapped air from the pipes.

If you’re unsure or the water doesn’t come back on correctly, your plumber can double-check everything before leaving.

Extra Tip: Label It

If you live with others, label the stopcock clearly so everyone in the household knows where it is. In an emergency, that quick action can save thousands of pounds in potential damage.

Why Choose Mr24HourPlumber

✅ Rapid 24/7 response across the Cotswolds and nearby areas
🧰 Fully qualified engineers for all plumbing and heating emergencies
🚐 Fast call-outs, we’re local, reliable, and always ready
💬 Clear advice and communication, no stress, no hidden surprises

When a plumbing disaster strikes, knowing how to turn off your water is step one. Calling Mr24HourPlumber is step two.