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How to fix a pool leak

We'll help you confirm a pool leak, locate it, and patch or repair—or know when to call a professional.

How-to · Home plumbing
30–60 min (bucket test + inspection); repair varies
What you'll need
  • Bucket (for bucket test)
  • Vinyl patch kit (for liner leaks)
  • Replacement O-rings (if fittings leak)
  • Silicone grease (optional)

At a glance

  • Use the bucket test to confirm a leak: place a bucket of pool water on a step, mark levels, compare after 24 hours.
  • Check fittings, skimmer, and return jets for visible cracks or loose connections.
  • Liner leaks can often be patched with a vinyl patch kit; larger tears may need professional repair.
  • Plumbing leaks outside the pool require a plumber or pool professional.
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Get started

Choose the option that matches what you see. You can jump straight to that section.

Steps

Goal: Confirm a leak, locate it, and patch or repair—or call a professional.

Bucket test

Goal: Confirm that the pool is actually leaking.

  • Fill a bucket with pool water. Set it on a step so levels match. Mark inside and outside. Wait 24 hours. Compare.
  • Good: Pool dropped more than bucket—you have a leak. Proceed to Check fittings.
  • Bad: Levels dropped the same—evaporation, not a leak. Check water chemistry and cover use.

Check fittings and liner

Goal: Locate the leak area.

  • Inspect skimmer, return jets, light niches, pump, filter, and plumbing for cracks, drips, or loose connections.
  • For vinyl liners, look for tears, holes, or worn spots at steps, corners, or wall seams.
  • Good: You find the leak. Proceed to Patch liner or Tighten fittings.
  • Bad: Cannot locate—call a pool professional. See When to get help.

Patch liner

Goal: Repair a small vinyl liner tear.

  • Clean the area. Apply a vinyl patch per kit instructions. Hold firmly for the recommended time.
  • Good: Patch adheres and leak stops. Proceed to Verification.
  • Bad: Large tear or patch fails—call a pool professional.

Tighten fittings

Goal: Stop leaks at fittings.

  • Hand-tighten fittings. Replace worn O-rings with exact matches. Lubricate with silicone grease.
  • Good: Leak stops. Proceed to Verification.
  • Bad: Still leaks—check for cracks in the fitting; replace or call a professional.

When to get help

Call a pool professional or plumber if:

  • The leak is in underground plumbing, the pump, or the filter.
  • The liner is severely damaged.
  • You cannot locate the leak.
  • You are not comfortable with the repair.

Do not drain the pool without professional guidance—it can damage the structure.

Verification

  • Bucket test confirms no leak, or the leak is repaired.
  • No wet spots around the equipment pad.
  • Water level stays stable over several days.
  • Fittings and liner are intact.

Reviewed by Blackbox Atlas

Frequently asked questions

How do I know if my pool is leaking?
Use the bucket test: fill a bucket with pool water, set it on a step, mark the water level inside and outside the bucket. After 24 hours, if the pool level dropped more than the bucket, you have a leak. Also watch for wet spots around the pool or equipment.
Can I fix a pool leak myself?
Small liner tears can be patched with a vinyl patch kit. Loose fittings can sometimes be tightened. Plumbing leaks in pipes or equipment usually require a pool professional or plumber.
When should I call a plumber for a pool leak?
Call a pool professional or plumber if the leak is in the plumbing, pump, or filter; the liner is severely damaged; or you cannot locate the leak. Do not drain the pool without professional guidance—it can damage the structure.

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