Leaking Pipes — Locating the Source and Understanding Your Repair Options

Not all pipe leaks are dramatic. A slow drip from a compression fitting behind a bath panel, a weeping solder joint in a wall, or a pinhole in a copper pipe under a floor can lose water for months before they announce themselves through a stain, a damp smell, or an unexplained rise in the water bill. Knowing how to confirm a leak exists, and where it might be, is the first step toward a repair.

Confirming a Leak Before You Call Anyone

The simplest test for a hidden water leak: turn off all water appliances in the house. Locate your water meter (usually in a small chamber in the footpath or driveway). Note the reading — including the small low-flow indicator dial or digital flow indicator if your meter has one. Return after two hours without using any water. If the meter has moved, you have a leak on the supply side.

Common Causes of Pipe Leaks

Compression joint failure

Compression fittings (the type that use a brass olive squeezed between a body and nut) are prone to weeping if they have been over-tightened, under-tightened, or disturbed by pipe movement. Tightening a leaking compression joint by a quarter-turn sometimes resolves it; complete failure of the olive requires cutting back the pipe and refitting.

Pinhole corrosion in copper

Small pinholes appear in copper pipe due to aggressive water chemistry (particularly soft, slightly acidic water), flux residue from poor soldering, or galvanic corrosion where copper meets dissimilar metals without a dielectric fitting. A single pinhole is usually a symptom that others will follow — the plumber will advise on whether a patch or a section replacement is more appropriate.

Plastic push-fit joint failure

Push-fit fittings (John Guest, Speedfit, Hep2O) are fast to install and generally reliable, but fail if the pipe is not cut cleanly and squarely, if it is not pushed fully home, or if the fitting has been used to make a connection beyond its recommended bend radius. Failure is usually immediate, but occasionally a push-fit joint that has not been fully engaged will hold for months before releasing.

Repair Options

For an accessible leak on a section of pipe in good general condition, a plumber will typically cut out the failed section and solder or push-fit a new piece. Where the pipe is in a wall or floor, non-destructive pipe location (acoustic listening equipment or tracer gas) can narrow the search area significantly before any cutting begins. For older properties with lead pipework, the plumber will almost certainly recommend full replacement rather than patch repair — lead supply pipes are a health concern and replacement schemes may be available through your water company.