Guide · Pipes, leaks & valves
Where the Main Water Valve Hides
A split pipe pours out several litres a minute. The house that gets its supply closed fastest loses the least drywall, carpet and batt insulation, so locating that valve and proving it still moves is worth ten minutes this weekend.
- A plumber answers when you call
- Clear price before any pipe is cut
- Basements left as clean as we found them
Why it matters in Markham
Most Markham houses take water from a service line that enters up through the slab or the street-facing foundation, most often on the side facing the street. The meter sits right there, with a valve on the house side of it and often a second one on the street side. In finished basements, builders and renovators frequently box this corner in behind a closet door, a removable panel, or the drywall around the furnace room. In split-level houses it can be low on the lowest level, sometimes tucked behind a laundry tub.
Step by step
- Find the meter. Head to the basement wall closest to the street. Look in the utility room, under the stairs, or behind an access panel.
- Identify the valve. Lever handle? That is a ball valve, shut by turning the lever across the pipe. A round wheel is a gate or globe valve: turn it clockwise until it stops.
- Test it gently. With a tap open upstairs, close the valve and see whether the flow stops completely. If the wheel will not move, do not force it.
- Open it again slowly. Turning it back too quickly can stir up sediment and cause a pressure bang.
- Label it. Clip a luggage tag to the handle and bring every adult in the household down to see it.
Mistakes to avoid
- Forcing a stuck wheel with a wrench. Old stems snap, and then the valve cannot be closed at all.
- Cranking the valve that sits before the meter. The city owns that one; work the valve after the meter instead.
- Covering the valve with storage boxes or drywall without an access panel.
- Leaving the tank heater firing. For a long shutdown, set its control to vacation or pilot first.
When to call a plumber
Call if the valve is seized, leaks, or does not fully stop the water. We cut out tired wheel valves and sweat or press in new full-bore lever valves; the valve replacement write-up walks through that job. If the problem is the curb stop out at the property line, that is usually a city matter: contact the City of Markham.
For emergencies right now, call (365) 334-6254 and keep the line open while you look; we can talk you through it.
Covering the valve with storage boxes or drywall without an access panel.
From the job notes of Plumbers in Markham
Guide · Pipes, leaks & valves
Signs to watch for
- Stains on a ceiling below a bathroom
- Flow that falls off when a second tap opens
Call a plumber when
- Water is reaching a ceiling, wall cavity or electrical panel
- Sewage is coming up through a floor drain or toilet
- You smell gas near the water heater: leave and call the gas utility first
- A valve will not close or a fitting keeps weeping after tightening
Markham note. Markham water service lines enter on the street-facing basement wall, and the main shut-off and meter usually sit right there. In older houses that valve is often a rusty multi-turn gate valve left untouched since the house was built.