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—Leaks and diagnostics

Damp ground, wet walls or a lifting deck near a pool

Water in the ground around a pool has to come from somewhere. Finding out where protects the pool, the deck and the house.

Persistent damp patches in the garden, wet boundary or house walls, efflorescence on masonry, or deck tiles lifting near the pool can all point to water escaping. It may be from the pool — a buried pipe, a fitting or the shell — or from irrigation, garden drainage or a villa water pipe.

Diagnostic guides describe what an owner can observe safely. They do not locate a fault; testing on site does that.

Comparing pool water loss with the damp patches, checking irrigation schedules and turning off irrigation for a few days helps distinguish the source. If the pool is losing water, leak detection can locate it. Water in the ground can undermine decks and foundations, so it is worth investigating promptly.

01Summary

What matters most here

  • Find the source

    Pool, irrigation or villa plumbing.

  • Test by elimination

    Turn off irrigation, measure pool loss.

  • Act promptly

    Water undermines decks and foundations.

02Detail

Possible sources

  • Pool pipework

    Buried supply or return lines.

  • Pool shell

    Through cracks or failed waterproofing.

  • Irrigation

    Leaks or overwatering near the pool.

  • Drainage

    Deck drains discharging into the ground.

  • Villa plumbing

    Water pipes near the area.

03Before you start

What to record

  • Photograph damp areas

    Over several days.

  • Measure pool loss

    With a bucket test.

  • Pause irrigation

    And see if damp reduces.

—In practice

How to use this

Switch off irrigation near the pool for a period and compare the pool’s water loss with the damp area. Check villa water pipes and garden drainage nearby. If the pool is losing more water than evaporation explains, arrange leak testing of its pipework and fittings before anyone starts digging around the damp patch.

Mistakes worth avoiding

Assuming it must be the pool
Irrigation, garden drainage and villa water pipes are common causes of damp ground near a pool. Rule them in or out first.
Digging before measuring
Excavating on a guess damages decks and gardens. Measurement first narrows where, and whether, digging is needed.

04FAQ

Common questions about this

Could my sprinklers be causing it?
Yes; pausing irrigation helps rule it in or out.
Why is my deck lifting?
Water beneath can wash out bedding or cause movement.
Can a pool leak damage the house?
Water near foundations should be investigated.
How is a buried pipe leak found?
Pressure testing and acoustic location.

05Read next

More pool guides on this

Filed under technical diagnostics & leak detection. Every pool guide is listed on the pool guides page.

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