How do I shut off water to a single toilet in Calgary?

The shut-off valve for a toilet is almost always right there at the wall or floor behind the toilet, on the supply line running from the wall or floor up to the tank. It looks like a small oval or football-shaped handle, or sometimes a flat-head slot. Turn it clockwise until it stops, then flush the toilet once to empty the tank. That is the whole job.

If the handle turns but water keeps running, the valve has failed and needs replacing. If there is no individual shut-off at all, you will need to use the main house shut-off instead, which is typically near the water meter in the mechanical room or utility area.

Finding the main shut-off matters before you need it. Locate it now, turn it a quarter-turn to confirm it moves freely, and make sure everyone in the house knows where it is. A stuck main shut-off is a problem you want to discover on a calm afternoon, not during a leak.

What to do if the valve needs replacing

Replacing a toilet shut-off valve is straightforward plumbing work. Under Alberta's Permit Regulation, replacing a valve when the piping itself does not change does not require a permit. A homeowner in Calgary who owns and lives in the home can do this work themselves without a permit, provided the supply piping is not being altered.

If you are comfortable turning off the main, draining the line and swapping the valve, it is a reasonable DIY task. The parts are inexpensive at any hardware store. If the supply line is old braided steel or corroded, replace it at the same time.

If you would rather have a plumber handle it, the work typically falls within a service call: expect a call-out fee in the range of $50 to $150, plus labour at roughly $85 to $150 an hour during regular hours. The valve and supply line are a minor parts cost on top of that.

A few things worth checking while you are back there: confirm the supply line is not kinked or showing mineral buildup at the fittings (Calgary's water is hard, with calcium and magnesium levels that can scale up connections over time), and make sure the toilet has a functioning shut-off at all before any repair work starts on the tank or fill valve.

Keep the receipt for any parts you buy and note the date the valve was replaced. That record is worth having if you ever sell the home or need to show a plumber what was done.