Leak Detection Toronto
Hidden Water Leak Detection & Pipe Repair
Leak Detection — Find the Source, Fix It Right, Stop the Damage
Hidden water leaks are the most expensive plumbing problem most homeowners don’t know they have.
A pinhole in a copper pipe inside a wall. A slow drip from a joint under the slab. A toilet that runs silently between flushes. None of them look like a crisis — until the water bill arrives, or the ceiling stain appears, or the mould does. By then, weeks or months of damage have already happened.
Professional Plumbing and Drain Services uses professional leak detection tools — moisture meters, pressure testing, and drain camera inspection — to locate hidden water leaks anywhere in your GTA home without unnecessary cutting or guesswork. We find it, we show you what we found, and we fix it with a flat-rate upfront price.
Call us now: +1 (437) 247-7856
Warning Signs You Have a Hidden Water Leak
- Unexplained spike in your water bill — if your usage hasn’t changed but your bill has climbed $30, $50, or more in a month, water is escaping somewhere in your system. This is the single most consistent early sign.
- Damp patches, stains, or bubbling paint on walls or ceilings — water travels along framing before it pools, so the visible stain is often not directly above or beside the actual leak
- Sound of running water when nothing is on — if you can hear water moving through pipes at night or between uses, a pipe is likely weeping somewhere inside the structure
- Low water pressure throughout the house — a significant drop in pressure across multiple fixtures can indicate a breach in the main supply line, not just a partially closed valve
- Musty or mildew smell in walls, under floors, or in the basement — mould establishes within 24–48 hours of sustained moisture; a persistent damp smell without a visible source almost always means water behind a surface
- Warm or wet spots on the floor — particularly relevant in homes with in-floor radiant heating, where a leaking heating pipe may be the culprit
Common Leak Types We Find and Fix
- Pipe leaks behind walls and ceilings — copper joints, threaded connections, and older galvanized pipe sections are common failure points in GTA homes built before the 1990s
- Leaking ceiling from the floor above — toilet wax ring failures, bathtub overflow drain leaks, and slow supply-line drips are the usual culprits; we trace the path and repair at the actual source
- Slab and underground supply line leaks — detected via pressure testing and, where needed, ground-level moisture mapping
- Toilet silent leaks — a toilet that runs intermittently wastes up to 200 litres per day and never makes enough noise to notice; we test and repair the fill valve or flapper
- Leaking pipe under slab or basement floor — common in older Toronto and North York homes with original cast-iron or clay drain lines
- Main water service line leaks — the supply line from the city connection to your home can develop slow leaks that drive up your bill for months without an obvious interior sign
Why a Hidden Leak Gets Expensive Fast
A slow leak of just one drip per second wastes roughly 30 litres of water per day — over 10,000 litres per year. At Toronto Water rates, that’s a measurable hit on every bill. More costly is the structural damage: water behind drywall causes mould, rot, and eventually compromised framing. Insurance claims for water damage are the most common home insurance claims in Canada — and many policies require that you demonstrate the leak was addressed promptly once discovered. The longer detection is delayed, the narrower the coverage window.
Other Services
Suspect a Hidden Water Leak?
Licensed Toronto plumbers locate & fix hidden leaks behind walls, ceilings & floors — flat-rate pricing, same day.
Leak Detection
Frequently Asked Questions
Leak detection service fees vary depending on the complexity of the search and the tools required. In most cases, the detection cost is rolled into the repair quote — you pay one flat-rate price for locate and fix, not two separate bills. We provide the quote before any work begins.
Yes, and quickly. Mould can establish behind drywall within 24 to 48 hours of sustained moisture exposure. If you're noticing a musty smell, wall staining, or a rising water bill — even without visible dripping — call us before assuming the problem will resolve on its own.
A sudden, unexplained increase in your water bill is one of the most reliable early signs of a hidden leak. Before assuming it's a billing error, check whether your toilet runs intermittently (listen for the tank refilling without flushing), and then call a licensed plumber. A 30-minute inspection can rule in or out a leak quickly.
We minimize access as much as possible. Using moisture mapping and camera inspection, we identify the precise location of a leak before making any opening. When access is required, we make the smallest practical opening, complete the repair, and can refer you to a trusted drywall trade for finishing if needed.