Guide · Pipes, leaks & valves
Reading Your Water Meter for Hidden Leaks
With every tap off, the small leak-detector dial on the meter should not move. If it turns, water is escaping somewhere, and the meter lets you narrow down where with nothing more than a shut-off valve.
- A plumber answers when you call
- Clear price before any pipe is cut
- Basements left as clean as we found them
The Markham angle
Markham bills water and wastewater by metered use, and the meter does not care whether the water went into a bath or dripped quietly through a basement ceiling. Many hidden leaks never leave a puddle. A toilet flapper, a buried irrigation line or a slow drip inside a wall can run for weeks before anyone notices.
The meter test costs nothing and needs no tools. It also gives you something concrete to tell a plumber, which makes any visit shorter.
One step after another
- Find the meter. In most Markham homes it sits in the basement, close to the street-facing wall where the water line enters, often beside the main shut-off.
- Stop all water use. Make sure nobody showers, flushes or runs the dishwasher, washer, ice maker, humidifier or softener for the test.
- Read the dial. Many meters have a little triangle or star called a low-flow indicator that spins with even tiny flows. Note its position and the full reading.
- Wait. Leave everything off for at least ten minutes. An hour is better for catching very slow leaks.
- Read again. If the indicator moved or the numbers changed, water is flowing somewhere.
- Narrow it down. Shut the shut-off valves under each toilet and repeat. If the movement stops, a toilet is the culprit. If it continues, the leak is in the supply piping, a fixture or a line outdoors.
- Test the main line. If the meter still moves with the main shut-off closed, which is uncommon, the leak may be in the meter or its connections; contact the city.
Where leaks hide
- Toilet flappers and fill valves, the most common source by far.
- Water softeners stuck in a regeneration cycle.
- Humidifiers on the furnace, which can bleed water to the floor drain unnoticed.
- Outdoor taps and irrigation lines, especially after a winter freeze.
- Pinholes in old copper or failing Poly-B fittings inside walls and ceilings.
Slip-ups we see often
- Testing while the ice maker or softener is refilling and blaming a phantom leak.
- Opening walls on a hunch. Moisture meters and thermal cameras can often find the spot first.
- Ignoring a small, steady movement. Small leaks rarely shrink.
Time to pick up the phone
Call if the meter moves and the toilets aren't to blame, if you see staining on ceilings or walls, or if a sudden jump in usage has no obvious cause. We offer non-invasive leak detection and can follow through with repairs. If the toilet turned out to be the culprit, see our brief on fixing a running toilet, and for billing questions, why your water bill spiked.
The habit worth keeping is simple: jot down the meter numbers at bedtime, compare them at breakfast, a couple of times a year. If nobody used water overnight, the numbers should match.
Where leaks hide Toilet flappers and fill valves, the most common source by far.
From the job notes of Plumbers in Markham
Guide · Pipes, leaks & valves
Signs to watch for
- The meter dial turns with every tap off
- 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.