How to Turn Off Your Water Supply: Essential Emergency Guide

Knowing how to turn off your water supply can prevent thousands of pounds in flood damage. Every Glasgow homeowner should know where their stopcocks and isolation valves are BEFORE an emergency happens.

Where to Find Your Stopcock (Internal Stop Valve)

The stopcock controls all cold water entering your property.

Common Stopcock Locations

Kitchen:

• Under the sink (most common)
• Behind kickboard near sink
• In corner cupboard

Other Locations:

• Under stairs
• In airing cupboard
• In cellar/basement
• Garage (attached properties)
• Downstairs toilet

How to Identify a Stopcock

• Brass or chrome tap-like valve
• Usually on a pipe coming through the wall or floor
• Turns clockwise to close
• May have a blue or red handle

How to Turn Off the Internal Stopcock

1. Locate the stopcock - Usually under kitchen sink
2. Turn clockwise - "Righty tighty" to close
3. May need gentle force - If stiff, use WD-40 and adjustable spanner
4. Check water is off - Run a tap, water should stop flowing
5. Leave tap open - To drain remaining water in pipes

Important: Turn your stopcock on and off once a year to prevent it seizing.

Outdoor Stop Tap (External Stop Valve)

If your internal stopcock doesn't work, use the outdoor stop tap.

Where to Find It

• Small metal or plastic cover in the pavement/path
• Usually near your property boundary
• Marked with "W" or "SV" (stop valve)
• Typically 30-60cm deep

How to Use It

1. Lift the cover (may need screwdriver)
2. Use a stop tap key (available from hardware stores, ~£10)
3. Insert key and turn clockwise
4. May need several turns

Note: In tenements, one outdoor stop tap may serve multiple flats.

Isolation Valves (Individual Appliances)

Modern plumbing has isolation valves for each fixture:

Where to Find Them

• Under sinks (hot and cold supplies)
• Behind toilets (one valve)
• Under baths (access panel)
• Behind washing machines/dishwashers

How to Use Them

• Lever handle: Turn perpendicular to pipe (off)
• Slotted head: Use screwdriver to turn 90 degrees

Tip: Isolation valves let you turn off one appliance without affecting the whole house.

Emergency Water Shutoff Checklist

Print this and keep it handy:

Emergency	Action
Burst pipe	Main stopcock OFF immediately
Overflowing toilet	Isolation valve behind toilet OFF
Leaking tap	Isolation valve under sink OFF
Leaking radiator	Radiator valves at both ends OFF
Boiler leak	Stopcock OFF + call Gas Safe engineer
Leak unknown source	Main stopcock OFF + call plumber

Glasgow-Specific Information

Tenement Flats

• Stopcocks often in shared close/stairwell
• May be in your hall cupboard
• Some older tenements have shared supplies
• Know which stopcock is yours

New Build Flats

• Usually have stopcocks in bathroom/kitchen
• May have master isolator in common area
• Check building documentation

Scottish Water Emergencies

If the leak is before your stop tap (their side):

• Call Scottish Water: 0800 077 8778
• Available 24/7

What to Do After Turning Off Water

1. Open taps to drain remaining water
2. Turn off immersion heater if you have one
3. Turn off central heating if possible
4. Collect leaking water with buckets/towels
5. Call a plumber for repairs
6. Document damage for insurance

Prevention Tips

• Know your stopcock location - Check today!
• Test annually - Turn on and off to prevent seizing
• Label isolation valves - So everyone in household knows
• Get a stop tap key - If yours is outside
• Know your neighbours' numbers - They may need to help in flats

Emergency Plumbing Help

For burst pipes, leaks, and plumbing emergencies in Glasgow:

Plumbers Glasgow Ltd:

• 24/7 Emergency: +44 141 468 9930
• 30-minute response time
• No call-out charge for booked jobs

Useful Numbers:

• Scottish Water: 0800 077 8778
• Gas Emergency: 0800 111 999
• Electricity Emergency: 105

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Related Services:

• Emergency Plumber Glasgow
• Burst Pipe Repair Glasgow
• Leak Detection Glasgow

Related Articles:

• Burst Pipe Emergency Guide
• What to Do When Your Pipes Freeze