Every pool loses some water. Evaporation is normal, splash-out happens, and backwashing your filter uses water. But there's a big difference between normal water loss and a pool leak — and knowing which one you're dealing with can save you thousands of dollars in water bills, structural damage, and costly repairs.
Pool leaks are more common than most Texas homeowners realize, and they're often hiding in plain sight. The tricky part is that a pool can lose hundreds of gallons of water a week through a leak that's completely invisible from the surface. By the time the damage becomes obvious, the problem has usually been developing for months.
This guide covers everything you need to know about pool leak detection — the warning signs, the common causes, what professional pool leak detection involves, and why acting fast is always the right call.
Before you can identify a pool leak, you need to know what normal water loss looks like. In Texas, evaporation is significant — especially during the long, hot summer months. A pool can lose anywhere from a quarter inch to half an inch of water per day through evaporation alone during peak summer heat. That adds up to roughly 1–3 inches per week depending on temperature, humidity, wind, and sun exposure.
Anything beyond that — especially during cooler months when evaporation slows — is worth investigating. If your pool is consistently dropping more than 2 inches of water per week, pool leak detection should be your next step.
A simple way to check at home is the bucket test:
The bucket test is a useful starting point, but it doesn't tell you where the leak is. That requires professional pool leak detection.
Pool leaks don't always announce themselves. But there are warning signs that show up long before the damage becomes severe. Here's what to watch for:
Your water bill is climbing without explanation. If you're constantly topping off your pool and your water bill has increased noticeably, a pool leak is a likely culprit. A pool losing even half an inch per day through a leak adds up to thousands of gallons per month.
You're adding water more than twice a week. Topping off the pool occasionally is normal. If you're adding water two or more times a week just to keep the level at the skimmer, your pool is losing water faster than evaporation can account for.
The ground around your pool is always wet or soft. Soggy soil near the pool equipment, along the pool walls, or in the yard beyond the pool deck is a strong indicator of a pool leak underground. If the ground stays wet even during dry weather, water is escaping somewhere it shouldn't be.
You're seeing cracks in the pool deck or surrounding concrete. Soil erosion caused by a pool leak can destabilize the ground beneath your pool deck, leading to settling, cracking, or shifting. If you notice new cracks appearing in your deck or coping, pool leak detection should happen immediately.
Your water chemistry won't stay balanced. Fresh water dilutes your pool's chemical balance. If you're constantly fighting to keep your chemistry stable and you're adding chemicals more frequently than usual, a pool leak that's pulling water out and forcing you to add fresh water may be the cause.
Your pool pump is pulling air. If your pump is regularly losing prime or you're seeing air bubbles coming through the return jets, there may be a leak on the suction side of the plumbing. This type of pool leak can cause serious pump damage if left unaddressed.
Equipment is running longer than usual. Some pool automation systems automatically compensate for low water levels by running longer cycles. If your pump seems to be running more than it used to, a pool leak may be the reason.
You notice algae growing in one specific area. A pool leak that's pulling water through a crack or gap in the shell can create areas of poor circulation where algae takes hold faster. If you're consistently fighting algae in one spot despite proper chemical maintenance, pool leak detection is worth scheduling.
Pool leaks can originate from several different areas, which is why professional pool leak detection is so important. Without the right equipment and training, pinpointing a pool leak is nearly impossible — and guessing wrong means tearing up the wrong area and still not fixing the problem.
Pool shell leaks. Cracks in a concrete, plaster, or gunite pool shell are a common source of pool leaks. These can range from hairline surface cracks to deeper structural fractures that allow significant water loss. Pool shell leaks are often caused by ground movement, freeze-thaw cycles, or the natural aging of pool materials.
Plumbing leaks. Underground plumbing is one of the most difficult pool leak locations to identify without professional equipment. Pipes carrying water to and from your pool can develop cracks, joint failures, or fitting separations underground — completely invisible from the surface but causing significant water loss.
Skimmer leaks. The skimmer is one of the most common locations for pool leaks. The joint between the plastic skimmer body and the concrete pool shell can develop gaps over time, especially as materials expand and contract with temperature changes. Skimmer pool leaks are often mistaken for normal evaporation because the water loss occurs right at the waterline.
Return jet fittings. The fittings where return jets connect to the pool shell can develop leaks over time, particularly in older pools. These pool leaks are usually slow but consistent.
Light niches. The conduit and fittings behind pool lights are a surprisingly common pool leak location. Water can escape through the conduit itself if the seal has failed, traveling through the pipe and away from the pool.
Pool equipment leaks. Leaks at the pump, filter, heater, or valve connections don't lose water into the pool — they lose water at the equipment pad. Wet ground around pool equipment, especially in dry weather, is a reliable sign of an equipment-side pool leak.
Professional pool leak detection goes far beyond looking at the water level and checking for visible cracks. Trained pool leak detection technicians use specialized tools and methods to locate leaks precisely — minimizing unnecessary digging, cutting, or disruption.
Pressure testing. Plugging off sections of plumbing and applying air or water pressure allows technicians to identify which lines are holding pressure and which are losing it. This narrows down exactly which pipe or section of plumbing has the pool leak.
Dye testing. Injecting small amounts of dye near suspected leak points — skimmer throats, fittings, cracks, and light niches — allows technicians to visually confirm where water is escaping. Dye testing is one of the most reliable methods for identifying the precise location of a pool leak.
Electronic leak detection. Advanced pool leak detection equipment can detect the sound of water escaping underground pipes without any digging. This technology allows technicians to pinpoint underground plumbing leaks to within a few inches before any excavation begins.
Structural inspection. A thorough visual and tactile inspection of the pool shell, coping, tile, and fittings helps identify cracks, separations, or deteriorated sealant that may be contributing to water loss.
The goal of professional pool leak detection is always to find the exact source of the problem before any repairs are made — so the fix is targeted, effective, and complete.
The longer a pool leak goes undetected, the more expensive the consequences become. Here's what an undetected pool leak can cost over time:
Water costs. A pool leaking just half an inch per day loses roughly 15,000 gallons per month in a standard-sized pool. At Texas water rates, that adds up fast — and it compounds every month the pool leak goes unfixed.
Chemical costs. Every time you add water to compensate for a pool leak, you're diluting your water chemistry and adding more chemicals to compensate. A pool leak effectively drains money through your chemical budget month after month.
Structural damage. Water escaping through a pool shell crack or underground pipe doesn't just disappear — it saturates the surrounding soil, erodes the base beneath your pool deck, and can undermine the structural integrity of the pool itself. Pool leak repairs caught early are relatively straightforward. Pool leaks that have been running for a year or more can require significant structural work.
Equipment damage. A pool leak that allows the water level to drop below the skimmer will cause the pump to run dry — burning out the motor and potentially damaging other components. A pump replacement is far more expensive than a pool leak detection visit.
With over 37 years of experience and a commitment to transparent communication, CK Pools will always explain exactly what was found, where the pool leak is located, and what repair options are available — before any work begins.
Think your pool might be leaking? Request your free pool leak detection quote at ckpools.com/contact and let CK Pools find the problem before it gets worse.
