A pool losing water overnight or a fountain that keeps needing a top-up is often blamed on evaporation. The truth is, a small leak in any outdoor water feature can waste thousands of litres each year. Finding it early saves money and protects the structure around it.
Professional leak detection is now far less disruptive than it used to be. Companies like LeakLab use non-invasive tools to pinpoint the problem without tearing up your yard. The process is accurate, and in most cases, repairs can follow the same day.
Photo by Mwabonje Ringa
Why Outdoor Water Features Are Prone to Leaks
Outdoor water features face constant stress from temperature shifts, ground movement, and UV exposure. These forces wear down shells, fittings, and plumbing connections over time. What starts as a hairline crack or a loose seal can quietly grow into a bigger problem.
The tricky part is that the leak source is rarely where the water shows up. Water travels along pipes and through soil before appearing on the surface. By then, the issue may have been going on for weeks without anyone noticing.
Common Sources of Leaks
Leaks can come from several different parts of an outdoor water system. Here are the spots that tend to cause the most trouble:
Pool shells and linings — cracks or separation in fibreglass, concrete, or vinyl surfaces
Return fittings and jets — seals wear out and connections loosen with regular use
Underground plumbing lines — pipes shift or crack beneath the surface over time
Equipment areas — pumps, filters, and heaters can develop slow, hard-to-spot drips
Fountain basins and waterfalls — grout, sealant, and basin edges break down with age
The Bucket Test: A Simple Check You Can Do at Home
The bucket test has been around for years, and it works. All you need is a bucket and a marker. Fill it with pool water, set it on a step so it sits at the same level as the pool surface, then mark the water line inside the bucket and on the pool wall.
Leave it for 24 hours with the pump off. If the pool has dropped further than the bucket, you have a leak, evaporation alone does not explain the difference.
This test won't tell you where the leak is coming from, but it confirms that evaporation alone isn't the cause. According to the U.S. Environmental Protection Agency, household leaks waste close to 1 trillion gallons of water in the US each year, and outdoor systems are a big part of that figure.
How Professionals Find Leaks Without Digging
Most homeowners assume leak detection means excavation.
Plenty of homeowners expect leak detection to mean excavation. It rarely does anymore. Trained technicians now carry tools that find the source without lifting a single paver.
Pressure Testing
Pressure testing works by isolating sections of plumbing and pushing controlled air or water through. A drop in pressure tells the technician exactly which line is compromised. For underground pipes, it cuts out any guesswork.
Acoustic Detection
Sensitive listening devices pick up the sound of water escaping through cracks or gaps in buried pipes. This approach works well for underground lines where digging would otherwise be the only way to investigate.
Dye Testing
Dye testing takes a different approach. A small amount of dye goes in near fittings, lights, and drains. If water is escaping through a crack or gap, the dye gets pulled toward it and marks the spot. Simple, but precise.
Together, these three approaches let a trained technician narrow the problem down to a specific fitting, pipe section, or area of the shell without unnecessary excavation.
What a Professional Leak Inspection Covers
A full inspection usually wraps up within a few hours. The technician starts with a visual check across the equipment, fittings, and shell, then runs targeted tests based on what they find. That covers a shell integrity check for cracks and settling, pressure testing on the return lines and main drain, dye testing around penetrations and fittings, and a look over the equipment area for any signs of moisture.
Once the leak is identified, they walk you through exactly what the repair involves. Minor issues at fittings or surface cracks are often fixed on the same visit. Larger problems like a cracked underground line may require a follow-up appointment with the right access tools.
The Pool and Hot Tub Alliance notes that undetected leaks are among the leading causes of long-term structural damage in residential pools. Getting on top of it early makes a real difference to repair costs down the track.
When to Call Someone In
Not every drop in water level needs urgent attention, but there are clear signs that professional help is the right move. If your pool is losing more than 5mm of water per day after ruling out evaporation, that's a good threshold to act on.
Other signs worth taking seriously include wet patches around the pool deck, soft ground near plumbing lines, or a noticeable spike in your water bill. These all point to water escaping somewhere it shouldn't be.
Waiting tends to make things worse. A loose fitting can turn into a structural problem if ignored. Saturated soil around a pool shell puts extra pressure on the walls over time. Repair costs generally climb the longer a leak goes unaddressed, so earlier action is almost always the better call.
Keeping Your Outdoor Water Features in Good Shape
Outdoor water features add real value to a home. Staying on top of maintenance helps them last longer and run better over the years.
A few practical habits make a consistent difference. Check water levels each week and note any unexpected drops. Inspect visible fittings and seals at the start of each season. Schedule a full pressure test every few years, or sooner if you spot anything unusual. If you're buying an older property with a pool, a pre-purchase leak inspection is a smart investment before settlement.
Leaks are common and they're fixable. The real goal is finding them before they turn into something more expensive to deal with.
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