Underground Water Leak Signs Lanzarote | Leakbusters

Why underground leaks are so easy to miss on Lanzarote

Lanzarote properties sit on volcanic ground. Basalt rock and lapilli (picón) drain water differently from the clay and sandy soils mainland builders are used to. A buried pipe leak here can pour hundreds of litres a day into porous rock and never produce a wet patch you'd notice.

This is how Leakbusters Lanzarote tells customers to spot an underground leak on their property before it becomes a real problem.

Signs of an underground leak on a Lanzarote property

Wet patches in places that shouldn't be wet

Lanzarote gets about 112 mm of rain a year. If you've got a persistently damp or muddy patch in a garden, drive, or yard when it hasn't rained in weeks, that water is coming from a pipe.

Check first:

• Near the property boundary where the main supply line enters. Original supply lines from when the property was built are the most pressured and the most likely to fail.
• Around the pool where circulation pipes run under paving or landscaping. Pool plumbing runs at higher pressure than domestic, so leaks here can be substantial.
• Under terraces and patios where buried drain or irrigation lines may have cracked.

One bit of garden suddenly greener

Most Lanzarote garden plants are adapted to barely any water — oleanders, palms, native succulents. If one patch of garden is noticeably greener or more lush than the rest, especially over picón gravel where moisture shouldn't sit, something is keeping roots there continuously fed. Usually a buried leak nearby.

The reverse can also be true. Above a slow leak you sometimes see:

• Root rot in plants that prefer dry feet
• Mineral salt deposits appearing on the surface
• Algae or moss in spots that should be bone dry

The midnight meter check

This is the cleanest at-home test. Takes 2-3 hours.

1. Turn off everything that uses water — pool pump, irrigation, ice maker, washing machine, dishwasher, water heater if you can.
2. Read your meter precisely. Get the small digits too.
3. Wait 2-3 hours. Don't flush a toilet, don't run a tap.
4. Read it again.

If any digit has moved, water is flowing somewhere it shouldn't. For pool owners, repeat the test with the pool fully isolated so you know if it's domestic or pool plumbing.

Drop in pressure

Underground pipe failures don't usually announce themselves. More often it shows as:

• Gradual pressure drop across all taps
• Intermittent pressure dips that get worse at peak times
• Air coming out of taps when first opened in the morning

Hissing or running water at night

Lanzarote nights are quiet. After midnight, walk the property and listen. A buried leak often hisses near ground level, or you can hear water moving under hard surfaces. Sound travels surprisingly well through volcanic rock — a leak can be audible metres from where it actually is. If you can hear water but no tap is on, you've found something.

Cracks and settlement

A long-running underground leak washes the fine volcanic particles out from under structures. Watch for:

• Paving slabs or tiles that have suddenly dropped, creating a trip or a pool
• New cracks in boundary walls or the building itself, especially diagonal ones
• Doors or windows that have started sticking where they didn't before

The leak undermines the support, the ground settles, the structure moves. By the time you see structural movement, the leak has been running a while.

Pool plumbing underground

Pools with buried plumbing have specific signs:

• Suction side fails (between pool and pump) — air gets sucked in, pump struggles to prime, you hear cavitation noise, you see bubbles in the return jets
• Pressure side fails (after the pump) — water gets pushed out under pressure, you usually get a clear wet zone between the equipment pad and the pool
• Main drain and skimmer lines under decking — usually the first to fail on older installs

Why Lanzarote properties are particularly prone

A few reasons buried pipes on Lanzarote fail more than you'd expect:

• Volcanic ground moves micro-amounts constantly — not earthquakes, just the slow movement that comes with the substrate. Rigid pipe materials don't like it.
• Broken basalt is abrasive — sharp edges grind against pipe surfaces over decades and eventually wear through.
• Thermal cycling — Lanzarote sun heats exposed ground hard during the day and it cools again at night. Pipes in the top half-metre expand and contract every 24 hours.

If your property was built in the 1975-1995 boom, you likely have:

• Galvanised steel mains that corrode from the inside
• Rigid PVC that's gone brittle from age and temperature cycling
• Minimal bedding material around the pipes — pipe sits directly on volcanic rock
• Missing thrust blocks at bends so joints have slowly worked themselves apart

That's the typical Lanzarote underground leak setup.

What to do if you suspect a leak

1. Photograph everything with dates. You'll want this later.
2. Run the midnight meter test a couple of times to confirm.
3. Watch any wet patches — are they spreading?
4. Pull your last few water bills and look at the trend.

Call Leakbusters Lanzarote when:

• The meter test shows water moving with everything off
• The wet patch won't dry out
• Your bill has gone up two periods running
• You can see structural settlement or cracking

How Leakbusters Lanzarote finds buried leaks

• Acoustic correlation — sensors at access points triangulate the sound of escaping water. Locates the break to within centimetres.
• Ground-penetrating radar — subsurface images showing voids, wet areas, and pipe routes.
• Tracer gas — hydrogen-nitrogen mix introduced into the pipe escapes through any leak and rises to the surface where a sensitive detector picks it up.
• Thermal imaging — surface temperature differences pick up moisture, especially around dawn and dusk when the ground temperature is shifting.

All non-invasive. We find the leak, mark its exact position, and the repair team digs the one hole rather than the trial-and-error trench.

Ongoing protection

A few things every Lanzarote property owner should do:

• Read the water meter once a month and compare to the same month last year
• Walk the property regularly looking for vegetation changes or wet spots
• Listen at night during quiet hours
• If the property is over 20 years old, get a professional underground inspection every 3-5 years

Underground leaks don't fix themselves. They get worse, the bill goes up, the structural damage accumulates. The earlier you catch it the cheaper it is.