Pool Leak Detection
Find out if your pool is really leaking and where the water is going
Suspecting a pool leak is stressful — but not every drop in water level is a leak. Portugal's hot, dry summers cause significant evaporation that's often mistaken for leaks. However, real leaks can cause structural damage, increase water bills, and waste chemicals. Knowing how to tell the difference is the first step.
Signs Your Pool May Be Leaking
These indicators suggest a possible leak rather than normal evaporation:
- Unexplained water level drop
- Wet spots around pool deck
- Visible crack in pool shell
- Higher than normal water bills
- Air bubbles in return jets
Common Causes of Pool Leaks
Leaks can occur in the pool structure, plumbing, or equipment:
Structural Crack
Cracks in the pool shell from ground movement, settling, or construction defects allow water to escape.
Plumbing Leak
Leaks in underground pipes or at fittings connections cause water loss that may not be immediately visible.
Sealant Failure
Failed sealant around skimmers, returns, and lights allows water to seep through penetration points.
Normal Evaporation
Portugal's warm, dry climate causes significant evaporation — up to 5-7mm per day in summer — which is often mistaken for a leak.
How to Check for Leaks (DIY Steps)
The bucket test is the most reliable DIY method to confirm a leak:
- 1
Perform Bucket Test
Fill a bucket to the pool water level, mark both levels, wait 24 hours. If pool drops more than bucket, you have a leak.
- 2
Mark Water Level
Use tape or a pencil to mark the current water level on the skimmer. Check again after 24 hours with the pump off, then 24 hours with it on.
- 3
Check Equipment Pad
Inspect around the pump, filter, and heater for signs of moisture, drips, or water stains indicating a leak.
- 4
Inspect Visible Pipes
Look at all visible plumbing connections, valves, and unions for drips or mineral buildup that indicates a slow leak.
- 5
Schedule Pressure Test
If you can't locate the leak, contact our team for a professional pressure test of the plumbing system.
Professional Leak Detection
Our team uses pressure testing, dye testing, and electronic listening equipment to pinpoint leaks without unnecessary excavation. We locate the exact source — whether it's in the shell, plumbing, or fittings — and provide a clear repair plan with upfront pricing.
Leaks vs. Evaporation in Portugal
In Portugal's summer, pools can lose 5-7mm of water per day to evaporation alone — that's up to 4-5cm per week. Before assuming you have a leak, perform the bucket test. If the pool drops faster than the bucket, you likely have a real leak that needs professional attention.
Frequently Asked Questions
How much water loss is normal in Portugal?
During summer, 5-7mm per day (about 3-5cm per week) is normal evaporation. Wind, low humidity, and lack of a pool cover increase evaporation. Anything significantly above this likely indicates a leak.
How do professionals find pool leaks?
We use a combination of pressure testing (to isolate plumbing sections), dye testing (to find shell cracks), and electronic acoustic equipment (to detect underground pipe leaks) — all non-invasive methods.
How much does pool leak repair cost?
Leak detection typically costs €150-€300. Repair costs vary widely — a simple fitting repair might be €80-€150, while underground pipe repair can be €500-€1,500 depending on location and access.
Can a pool leak damage my property?
Yes. Persistent leaks can erode soil around the pool, undermining the deck and surrounding structures. They can also cause sinkholes, foundation issues, and damage to landscaping. Early detection prevents expensive property damage.
Should I use a pool cover to reduce water loss?
Absolutely. A pool cover reduces evaporation by up to 95% and also reduces chemical consumption and heating costs. We recommend covers for all pools in Portugal, especially during the hot summer months.
Need Professional Help?
Our expert technicians are ready to solve your pool problems quickly and effectively.