The most damaging leaks are the ones you don't see. By the time water is dripping from a ceiling or pooling on the floor, a slow leak inside a wall or under a slab may have been running for weeks — quietly soaking drywall, growing mold, or undermining the area around a foundation. Catching the early signs is the difference between a small repair and a major one.
This checklist walks through what to watch for, where to look, how to test your meter, and when to call — so you can catch a leak before it becomes a project.
Watch for the early signs
An unexplained jump in your monthly water bill is often the very first sign — a silent toilet flapper or a pinhole in an underground line can waste hundreds of gallons without ever surfacing. If your usage habits haven't changed but the bill has, something's leaking.
Other early signs: the sound of water running when nothing is turned on, low pressure at one fixture while the rest of the home is normal, a warm spot on the floor, a musty smell near a wall or cabinet, or dampness and discoloration at a baseboard.
Check the meter
The definitive do-it-yourself test is the meter check: turn off everything in the home that uses water — including ice makers and humidifiers — and go look at the meter. If the low-flow indicator is still moving or the dial is advancing, water is going somewhere it shouldn't be. That's the moment to call.
For a toilet, a few drops of food coloring in the tank (wait 15 minutes without flushing) will show whether the flapper is leaking into the bowl. For a slab line, a warm floor patch is the giveaway. Each leak has a signature; the meter confirms there is one.
Know where leaks hide in Mesa homes
Most Mesa homes are built on slab, so a leaking supply line under the concrete is a real possibility — and the signs are subtle: a warm floor, a damp carpet edge, a hairline crack, or a bill that climbs. The hot line is the most common slab leak, which is why a warm patch is such a telling sign.
Behind walls and under cabinets are the other quiet spots: a slow drip at a supply line, a corroded angle stop, or a failed seal at a fixture junction. These show up as damp drywall, a cabinet bottom that's warped, or a musty smell before they ever show visible water.
When to call instead of waiting
Call if the meter is moving with everything off, if you find a warm floor patch, if there's dampness or a musty smell with no obvious source, or if a fixture won't stop running despite a flapper or fill-valve check. A few hours of a hidden leak can soak insulation and start mold that takes days to dry out.
Don't wait if water is near electrical outlets, wiring, or the breaker panel — that's an immediate shut-off and a call. The sooner a leak is located, the smaller the repair and the less secondary damage.
What a professional leak detection looks like
Non-invasive detection is the whole point: we use pressure testing, acoustic listening, and thermal inspection to pinpoint a leak's exact location before anyone opens a wall, cuts drywall, or breaks concrete. The goal is the smallest possible access, exactly where the leak is — not a search-and-destroy approach that opens the wrong wall.
We confirm the leak, mark the access, and walk you through what we're opening and why before we do it — so the repair targets the actual problem and nothing else.