Is Your Pool Leaking? How to Tell if the Problem is the Shell or the Plumbing

I’ve spent the last 12 years crawling through backyards across North Austin, from the rocky terrain of Round Rock to the shifting soils of Pflugerville and Hutto. If there is one thing I’ve learned after performing thousands of pressure tests, it’s this: homeowners usually panic and start looking for a shovel way too early. Before you let someone start tearing up your deck, let’s talk about how we actually find a leak without guessing.

Before we do anything else, I always have to ask: How often does your autofill run? If you’re filling that pool every single day, you aren’t Click here for more info https://www.levelupleakdetection.com/north-austin/pflugerville/pool-leak-detection just losing water; you’re losing money and potentially damaging your equipment. But is it a plumbing line, or is the pool shell itself giving up the ghost? Let’s break it down.
The Pflugerville Factor: Why Clay Soil is the Enemy
If you live in Central Texas, you know our soil. It’s heavy, expansive clay. It moves. In the summer, it dries out and shrinks, creating voids under your deck and pool. In the winter or during a heavy rain, it swells and pushes against your plumbing and your shell. Think of your pool like a giant boat sitting in a sandbox that’s constantly changing shape. Eventually, something has to give.

Most people assume it’s the plumbing. However, in our area, shell cracks—specifically at separation points—are incredibly common because the ground literally shifts the pool structure. If your pipes are still holding pressure, the culprit is almost always the structure itself.
Pressure Tests: The Truth Tellers
Ask yourself this: when i show up with my notebook, the first thing i do is line-by-line pressure testing. I don't guess. We isolate the return lines, the main drain, and the skimmer lines. If these lines hold pressure—meaning the needle on my gauge doesn't drop—we have officially ruled out the plumbing.

When pressure tests hold, the leak is in the shell. It’s that simple. If the plumbing is tight, the problem is either a structural crack, a faulty light niche, or a fitting behind the tile line.
Advanced Detection: Using Technology, Not Guesswork
I get annoyed when I hear about contractors who show up and say, "We’ll just dig here and see what we find." That’s a recipe for a ruined backyard and a wasted budget. At Level Up Leak Detection, LLC, we believe in "no-drain, no-dig" detection. We use professional-grade gear to pinpoint the leak before a single tool touches the ground.
The LeakTronics Hydrophone
The LeakTronics hydrophone is a game-changer. Think of it like a doctor’s stethoscope, but for water. I can drop this into the pool and listen to the "hiss" of water escaping through a shell crack. If the pool is quiet, it’s a tiny weeping leak. If I hear a distinct roar, I know exactly where the pressure is finding the path of least resistance. The hydrophone detects shell leaks by listening for the turbulence created as water exits the structure.
Electronic Shell Scanning
For those hairline cracks that are too small to see with the naked eye, we use electronic shell scanning. We send a small electrical charge through the water. If there’s a break in the integrity of the shell (the plaster, epoxy, or concrete), the current finds it, and our equipment alerts us to the exact spot. It’s precise, fast, and completely non-invasive.
Common Leak Locations in Central Texas Pools
In my experience, leaks in the shell aren't random. They happen at specific "stress points." Here is where I usually find them:
Skimmer Throats: The expansion joint between the skimmer and the pool wall is a classic failure point. Light Niches: The conduit that runs from your pool light back to the equipment pad is a major leak candidate. Main Drain Sumps: Often neglected, these can crack due to hydrostatic pressure from the ground below. Tile Line/Coping: Settling in the deck can cause the bond beam to crack right at the water line. How We Calculate Your Investment
Here's a story that illustrates this perfectly: wished they had known this beforehand.. I get asked about pricing constantly. Because every pool is a different size, has a different number of lines, and presents a different set of obstacles, there is no specific price list I can give you over the phone. Pricing depends on pool size and system complexity. A simple play pool in Hutto is a much different job than a massive lagoon-style pool in North Austin. We provide a custom quote for every job so you aren't paying for work you don't need.
Quick Comparison: Plumbing vs. Shell Indicator Plumbing Leak Shell Leak Pressure Test Fails (Needle drops) Passes (Needle holds) Primary Tool Acoustic/Pressure Equipment Hydrophone/Electronic Scanner Primary Cause Tree roots, joint failure Ground movement, stress cracks Why You Need a Specialist
You wouldn't ask a plumber to fix your computer, and you shouldn't ask a general pool cleaner to find a hidden structural leak. Many technicians lack the specialized training to interpret LeakTronics audio signals or run a proper shell scan.

My goal is to save your backyard. By identifying exactly where the water is escaping, we can perform targeted, surgical repairs rather than jackhammering your entire pool deck. That saves you time, money, and a massive headache.
The Final Verdict
If you suspect a leak, stop topping off the water and start looking for the signs. Is there wet soil in a specific corner of the yard? Is the water dropping even when the pump is off? (If it drops with the pump off, that's a huge indicator it's a shell leak, as the plumbing is no longer under pressure).

Don't wait for a small crack to turn into a major structural failure. If you are in North Austin, Pflugerville, Round Rock, or Hutto and you want someone who actually knows how to test, document, and fix the issue, reach out to Level Up Leak Detection, LLC. Let's get that pool back to holding water.