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Reel One: The Valve

Finding Your Main Water Shut-Off

Every house has one valve that stops all the water. Most people meet it for the first time during a flood. Here is how to find it on a quiet day instead.

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The short version

In most Oakville houses, the primary shut-off is in the lower level on the front wall, next to where the water line enters from the street. It sits next to the water meter, usually on the house side. It will be either a round wheel handle or a lever. Turn the wheel clockwise until it stops, or turn the lever a quarter turn so it sits over the pipe.

Locking pliers hanging in a workshop
Locking pliers hanging in a workshop.

Step by step

  1. Head to the front of the basement. The service line runs from the street, so the valve is usually on the wall facing the road.
  2. Look for the meter. Halton Region water meters are small and often have a wire leading to a reader outside. The valve is beside it.
  3. Check behind finished walls. In finished basements, the valve may be behind an access hatch, inside a cupboard, or under the stairs.
  4. Try other places in slab homes. Houses without basements may have the valve in a utility room, a garage or near the water heater.
  5. Test it gently. Turn it off, open a tap upstairs and confirm the flow stops. Then turn it back on slowly.
  6. Label it. A bright tag tells everyone in the house where to go.

Condos and townhouses

Apartment-style condos often have a valve for each suite inside a cupboard or behind an access panel close to the kitchen or laundry. Some have valves only at the fixture level, and the main riser shut-off belongs to building management. Townhouses vary. Our guide to condo and townhouse plumbing explains why.

Every toilet, sink and the water heater has its own small shut-off. For a single leaking fixture, close that one first and keep water to the rest of the house.

Keep this kit by the main shut-off

  • Flashlight or headlamp
  • Bucket and old towels
  • Adjustable wrench and slip-joint pliers
  • Flange plunger for toilets, cup plunger for sinks
  • Label on the main valve so anyone can find it

Mistakes to avoid

  • Forcing a stuck wheel valve. Aging gate valves can snap their stems. Use steady hand pressure, not a wrench on the handle.
  • Confusing the main with the valve for the outdoor hose bib or humidifier.
  • Burying the valve behind shelving or drywall without an access door.
  • Waiting until an emergency to look. Find it today.

Once you have found it, show everyone in the household, including older children and anyone who looks after the house while you travel.

Stop and phone a plumber when

  1. 1A ceiling or wall starts dripping
  2. 2More than one drain backs up at once
  3. 3You smell gas or sewage indoors
  4. 4A valve will not turn or drips when touched

When to call

Call if the valve will not move, if it leaks around the stem when turned, or if water keeps flowing with the valve closed. Old gate valves wear out, and replacing them with a quarter-turn ball valve takes little time and earns its keep the first time you require it. If water is already pouring, the curb stop at the property line can shut supply, but it is operated by the Region, so call them or a plumber. For the next steps in a leak, read what to do when a pipe bursts, and for urgent help see emergency plumbing.

Straight answers to common calls

In which direction do I turn the main valve to shut it off?

Clockwise for a wheel handle. For a lever, turn it so it sits across the pipe rather than along it.

Am I allowed to shut the water at the street myself?

The curb stop belongs to the municipality and needs a special key. Contact Halton Region or a plumber.

How often should I exercise the main valve?

Cycling it off and on one time or twice a year helps keep it from seizing.

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