How long can a slow leak run at the cottage before anyone sees it?
Updated
A drip under the sink. A fitting weeping behind the washer. A toilet seal letting a thin stream into the subfloor. Nothing floods, nothing you can hear from the front door — which is exactly why a slow leak can go on for weeks before anyone notices.
How to find out whether you have a slow leak
1. Turn off every tap and appliance
Make sure nothing is using water: taps closed, washer and dishwasher off, toilets refilled, no irrigation running. If you have a water softener or treatment system that cycles on its own, make a note of it.
2. Read the water meter or the well gauge
On municipal water, write down the meter reading, then check it again after a while with nothing running. If it’s moved, water is going somewhere. On a well, watch the needle on the pressure-tank gauge: if pressure drops while nothing is running and the pump kicks in by itself, that’s the same signal.
3. Listen to the house
In the quiet, put your ear near the bathroom walls, the water heater and the water entry. A faint hiss, dripping inside a wall or a toilet tank refilling for no reason are all clues.
4. Check the hidden spots
Open the cabinets under the sinks and touch the bottom: damp, warped, stained? Look behind the washer, under the water heater and in its pan, and around the base of the toilets. In the basement, run a flashlight along the joists under the bathroom and the bottom of the walls.
5. Test the toilets
A running toilet is a classic slow leak. Put a few drops of food colouring in the tank without flushing. If the colour shows up in the bowl after a while, the flapper is letting water through.
6. If you find a leak, shut the water and call
Close the fixture’s own shut-off or, if needed, the main valve. Take photos, then call an RBQ-licensed plumber. If water has soaked into materials, let your insurer or broker know.
Why a slow leak goes unnoticed
It’s silent. A real burst gets heard and seen fast. A slow leak partly evaporates, soaks into wood or drywall, and travels where nobody looks: inside a wall, under a floor, behind a vanity.
Materials absorb before they show. Plywood subfloor, a joist, insulation will soak up water for a long time before a stain appears on the ceiling below. By the time you see it, the water has usually been there a while.
The cottage is empty. At home, you’d notice a smell, a soft floor, a higher water bill. At the cottage, you arrive Friday night, leave Sunday, and most cottages on a well don’t even get a water bill to tip you off.
The Townships add their own traps. Plenty of cottages in Sutton, Dunham or Brome Lake have plumbing that was reworked with each addition, with fittings in crawl spaces or behind screwed-on panels. Freeze-thaw cycles work those fittings season after season. And a well pump cycling to keep up with a small leak can wear out without anyone hearing it.
So how long, really?
There’s no typical length of time: it depends on how fast the leak runs, where the water goes, and how often someone looks. A leak inside a wall can stay invisible until it reaches a ceiling, a floor or your nose. What’s certain is that the longer it runs, the more materials it reaches and the more time mould has to take hold — Health Canada advises repairing any leak or infiltration and drying wet surfaces within 48 hours.
Only a professional who sees the place can price a repair. What can be measured is the time: one meter reading compared with the last one gives the leak a start date.
Prevention: what you can do, and what belongs to a plumber
What an owner can do:
- Read the meter or pressure gauge when you arrive and when you leave, all taps closed, and write the numbers down.
- Do the food-colouring test on the toilets once or twice a season.
- Keep under-sink cabinets clear enough to see the bottom.
- Replace tired washer hoses and check the water heater pan.
- Put leak sensors in the risky spots, knowing they go quiet if the power or the internet goes down.
What belongs to an RBQ-licensed contractor:
- Tracking down a leak inside a wall or floor with the right tools.
- Replacing a fitting, a worn toilet flapper assembly or a leaking valve.
- Installing an automatic shut-off valve or a flow-sensing meter.
- Assessing a pressure tank or a well pump that cycles too often.
In an empty house, how long before anyone notices?
The honest answer: as long as nobody looks in the right place. A quick stop that just flips the lights on won’t catch a slow leak. What catches it is a meter or gauge reading compared with the last one, plus a look under the sinks and in the basement every visit.
How often someone stops by sets the maximum length of time a leak can go unnoticed. If your insurer sets conditions for an unoccupied home, the details vary from policy to policy: ask your broker what applies to your cottage.
What we look at on a visit
Every visit, with all taps closed, we read and log the water meter or the pressure-tank gauge and listen for the well pump starting on its own. We open the under-sink cabinets and look behind the washer, listen to the toilets and check the bowl level, look at the base of the water heater and its pan, and run a flashlight over the basement floor and lower walls. Readings are compared from one report to the next: the trend is what gives a slow leak away.
If a number moves for no reason, we call you the same day with photos, and meet an RBQ-licensed plumber on site if needed, documenting the work.