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Signs of a Slab Leak in Los Lunas
You've noticed something, and you're trying to decide whether it's worth a call. Maybe it's a bill, maybe a sound, maybe a patch of floor that feels different from the rest.
This page walks through the clues a slab leak tends to leave, grouped by where you'll notice them, along with the common problems that look like slab leaks but aren't.
Chapter 1
A high water bill, a leak you can hear and meter clues
These are often the earliest signs, and the easiest to check without touching anything.
Chapter 2
Clues in floors, walls and baseboards
Inside the house, slab leak clues tend to show up low, in the floor itself or where it meets the wall.
- A warm patch on tile or wood that has no obvious cause
- Carpet that feels damp or smells musty with no spill
- Wood boards cupping, lifting or gapping
- Baseboards swelling, staining or peeling at the bottom
- Cracks in tile or grout that keep spreading around one spot
Cracks alone are common and often have nothing to do with plumbing. It's cracking together with damp or warmth that matters. Warm patches in particular point to the hot side; see hot water slab leaks.
Clues outside, along the foundation
Sometimes water from under the slab works its way out. Look for soil that stays damp along one stretch of the foundation when it hasn't rained or been watered, a patch of unusually green growth next to the house, or water collecting beside the slab.
In a dry climate, ground that stays damp beside the house for no reason stands out. Turn off irrigation before you judge, so sprinkler overspray doesn't fool you.
Chapter 3
When it turns out not to be a slab leak
Plenty of meter and bill clues come from somewhere easier to fix. These are the usual suspects.
Chapter 4
What to do next
If two or more clues line up, or the meter moves with everything off, it's time to have it checked. Book slab leak detection so a technician can confirm where the water is going before anything is opened.
Thinking about a claim? Read our insurance questions page and start taking dated photos now.
Chapter 5
Keep a simple leak log
If the clues are vague, a few days of notes can turn a hunch into something a technician can act on. It also gives you a record if you end up talking to your insurer.
- Meter readings at the same time each day, ideally once after the house has been quiet overnight.
- First-noticed dates for each clue: the warm patch, the damp carpet, the sound.
- Changes in size whether a warm or damp area is growing, shrinking or moving.
- Water heater habits how often it runs and how quickly hot water runs out.
- Repeat photos of the same spot each day, taken from the same position.
- What you've ruled out such as toilets or irrigation, so no one checks them twice.
Bring the log to the phone call. Even a short list helps us match you with the right technician and helps them decide where to start.
Chapter 6
How signs of a slab leak show up in Los Lunas homes
In newer West Los Lunas homes, the first clue is often a damp patch near a bathroom or kitchen where a PEX fitting under the slab has given way. Movement in caliche and clay can show up as cracking, which is why a crack beside a damp spot deserves attention.
Older Village Center homes can be harder to read. Not every house there sits fully on a slab, and some have been added onto over the years, so damp in one room may come from a line in another. Tell us what you've noticed and we'll help work out whether it sounds like a slab leak.
If the signs add up
- Do the meter test and write down what happens.
- If the floor is warm, closing the water heater's cold supply can slow a hot-side leak. Keep away from gas and electrical controls.
- Close the main shut-off if water is surfacing.
- Take dated photos of anything wet, cracked or warped.
- Don't pull up flooring to look underneath.
Smell gas? Leave the home and call the gas utility and 911 from outside.
Chapter 7
Questions about slab leak symptoms
Describe what you're seeing on the phone for a more specific answer.
For many people it's the water bill or the meter. A bill that climbs without explanation, or a meter that keeps moving with everything turned off, often shows up before anything visible in the house. Warm spots, damp flooring and the sound of running water tend to follow, depending on where the leak is and whether it's on the hot or cold side.
Water and movement under a slab can stress tile, grout and some flooring, and cracking near a damp or warm area is worth taking seriously. But cracks are common in many homes for reasons that have nothing to do with plumbing. A crack on its own isn't a reliable sign; a crack alongside other clues is.
A hidden leak is one possibility, but so are a running toilet, an irrigation problem, a dripping spigot or a change in household use. Start with the meter test. If the meter moves with everything off, water is escaping somewhere, and the next step is figuring out where.
Yes. A toilet that runs between flushes can move the meter and raise the bill just like a hidden leak. Listen for the tank refilling on its own. Ruling out toilets and outdoor fixtures first can save you a visit.
Pressurised water escaping from a pipe can make a hissing or rushing sound that carries through concrete and walls. It's often easiest to hear at night. It could also be a toilet refilling or an appliance, so check those before assuming it's under the floor.
Ongoing moisture under floors and inside walls can create damp conditions where mould may grow. If you're concerned about mould or water damage, a restoration specialist is the right professional for that part. We connect homeowners with plumbing professionals for the leak itself.
Many people do both. A technician can confirm whether there's a leak and where, which gives you specific information to share with your insurer. Your insurer can tell you what they need from you. Either way, take photos and note dates from the start.
If the meter moves with everything off, or water is surfacing, act soon. A leak that keeps running keeps wasting water and can affect flooring. If the signs are vague, a phone call costs nothing and can help you decide.
Yes. Water from a slab leak can soak into the soil beneath the house without ever reaching the surface. In those cases the only signs may be the meter, the bill or the sound of running water, which is why the meter test is so useful.
Usually not. Outdoor concrete cracks for many reasons, including temperature swings and ground movement, and it isn't part of the house slab. What's more telling is soil that stays damp, or water pooling, right beside the foundation when there's been no rain or irrigation.
Seeing more than one of these?
A quick call can tell you whether it's worth sending a technician.
Call and describe what you've found