Pool Crack or Structural Leak? Guide for San Antonio TX

Not every pool crack means trouble. Some cracks are surface-level. They look bad but do not leak. Others run deep and let water escape into the ground below.

So how do you tell the difference? That is what this guide is for. If you are a pool owner in Castle Hills, San Antonio TX, or anywhere in South Texas, knowing the signs of a leak early can save you from expensive repairs down the road.

At South Texas Pool Leak Detection, we help homeowner families find and fix leaks before they become bigger problems. Our CPO-certified team uses advanced tools to locate leaks fast. We have served the area since 2015 with over 2,600 happy customers.

Call us at (210) 570-5033 for a free inspection.

Surface Cracks vs. Major Structural Leaks: What Is the Difference?

A swimming pool is built to hold thousands of gallons. Over time, the shell can develop cracks. But not all pool cracks are the same.

Surface cracks sit in the top layer of plaster, tile, or finish. They are often hairline thin. They do not go through the shell. These cracks may look worrying, but they rarely cause water loss. A small crack in the plaster is usually cosmetic.

Structural cracks go deeper. They cut through the shell itself. These cracks let water seep into the soil. If left alone, they lead to major structural damage. The ground around the pool erode, the deck shifts, and repair costs climb fast.

Here is a quick way to tell:

Type	Surface Crack	Structural Crack
Depth	Top layer only	Through the shell
Width	Hairline, hard to feel	Wider, visible gap
Water Loss	None or very little	Steady and measurable
Growth	Stays the same size	Gets longer or wider over time
Risk	Cosmetic concern	Structural damage and soil erosion

If a crack grows, moves, or leaks, it is not cosmetic. It is a structural problem that needs attention.

Early Warning Signs Your Pool Has a Leak

Catching a pool leak early saves you money and stress. Here are the early warning signs every pool owner should watch for:

Water level drops more than a quarter inch per day
Your water bills spike with no clear reason
The pool deck has soggy or soft spots near the edge
You see cracks in the pool shell that were not there before
You are adding more chemicals than usual to keep the water balanced
The pool pump pulls air instead of water
You notice shifting soil or ground movement near the pool
Tile or coping pops loose along the waterline

Any one of these can point to a pool leak. If you see two or more, do not wait. A small leak turns into serious problems fast. Call a professional before it gets worse.

The Bucket Test: A Simple Check You Can Do at Home

Before you call for professional leak detection, try the bucket test. It is a quick, free way to check if your pool is losing water to a leak or just normal evaporation.

Here is how it works:

Fill a bucket with pool water. Set it on the pool step so it is partially submerged.
Mark the water line inside the bucket.
Mark the pool water line on the outside of the bucket.
Wait 24 hours. Do not use the pool during this time.
Check both marks after 24 hours.

If the pool dropped more than the bucket, your pool is losing water beyond normal evaporation. You likely have a suspected leak.

If both dropped the same, the water loss is from evaporation. No leak.

The bucket test is a great first step. But it only tells you that a leak exists. It does not tell you where. For that, you need a professional pool leak detection service.

How We Find Pool Leaks: Our Leak Detection Process

At South Texas Pool Leak Detection, we use proven tools to locate leaks with pinpoint accuracy. Our process goes well beyond a visual inspection.

Here is what we do:

Pressure testing on every plumbing line to find which pipe or fitting leaks
Electronic listening devices that hear water escaping underground
Dye testing at the skimmer, returns, drain, and any visible crack
Camera checks to view the inside of plumbing lines

We check the entire pool. Shell, plumbing lines, tile, pool deck joints, skimmer, drain, and the fitting at every connection. Our goal is to find the exact location of the leak so repairs are targeted and cost-effective.

As a trusted pool leak detection team, we give you a clear report. You will know the location of the leak, what caused it, and what it takes to fix it. That peace of mind matters.

Pool Crack Repair: How We Fix It

Once we locate leaks, we move to pool crack repair. The fix depends on the type of crack and how bad it is.

For surface cracks:

Patch with pool-rated plaster or epoxy
Resurface the affected area to blend the repair
These are often quick fixes that wrap up the same day

For structural cracks:

Inject epoxy or polyurethane to seal the crack through the shell
Staple the crack with carbon fiber or steel staples to stop it from growing
In severe cases, cut out the section and rebuild

Structural problems need a skilled hand. A bad fix can make things worse. Our team has the training and tools to handle pool crack repair the right way.

We also handle plumbing repair when cracks affect the pipes around the pool. If a crack in the shell has damaged a pipe or fitting, we fix that too.

What Causes Pool Cracks in South Texas?

South Texas is tough on pools. Here are the top reasons pools develop cracks in the Castle Hills and San Antonio area:

Shifting soil from Texas clay that swells with rain and shrinks in drought
Ground movement from nearby trees or construction
Concrete cancer where rebar rusts and expands inside the shell
Age as plaster, tile, and gunite wear down over the years
Poor construction with thin walls or bad steel placement
Freeze-thaw cycles during rare cold snaps

Many of these causes are beyond your control. That is why regular inspection and catching leaks early matter so much.

When to Call a Professional

Some pool issues are fine for a DIY approach. A pool leak is not one of them. Here is when you should call a professional:

Your pool loses more than a quarter inch per day after the bucket test
You see a crack that is growing in length or width
Soggy ground appears near the pool with no clear source
The pool pump loses prime often
You have tried quick fixes but the water still drops

Do not wait for a small crack to become a major structural leak. A suspected leak is reason enough to call. The sooner you act, the lower the repair costs.

South Texas Pool Leak Detection offers fast, accurate inspection and repair service. We find and fix leaks so you do not have to guess.

★★★★★

"We noticed a water level drop in our pool. After taking bids we hired So Texas Pools to do our leak testing. They came out quickly and did a thorough inspection of our system. They found the problem and we were able to address it promptly. Highly recommend!"

Joeangel Martinez Jr, Roosevelt, TX | (210) 570-5033

How to Prevent Pool Leaks and Structural Damage

You cannot stop every crack. But you can lower the risk. Here are tips for every swimming pool owner:

Schedule a yearly inspection. A pro can spot a pool leak early before it grows.
Keep water chemistry balanced. Bad chemistry eats away at plaster and tile.
Watch your water level. Track it weekly. A steady drop is a red flag.
Fix small cracks fast. A small crack today is a big repair tomorrow.
Trim tree roots near the pool. Roots cause ground movement that stresses the shell.
Do not drain the pool without pro guidance. An empty pool can pop out of the ground.

These steps help you avoid expensive repairs and keep your swimming pool in great shape for years.

Service Areas We Cover

We serve Castle Hills, San Antonio, and all of South Texas:

Leon Valley, Hollywood Park, Shavano Park, New Braunfels, Canyon Lake, Cross Mountain, Fair Oaks Ranch, Lakehills, Schertz, Converse, and Roosevelt.

Whether you live in Castle Hills or anywhere nearby, our team is ready to help.

Ready to Find and Fix Your Pool Leak?

If you are a pool owner in South Texas and you see cracks, water loss, or any signs of a leak, do not wait. A swimming pool leak repair done early is always cheaper than one done late.

South Texas Pool Leak Detection offers professional leak detection, pool crack repair, pool repair, and plumbing repair for pools across San Antonio TX and beyond. We are your go-to repair service for finding and fixing pool leaks.

Call us today at (210) 570-5033 for a free estimate. Let us check your pool and give you the answers you need.

‍

Releted Blogs

Fixing Leaks Without Digging: How Trenchless Pipe Repair Saves Your San Antonio Backyard



June 17, 2026

Learn how trenchless pipe repair and trenchless pipe lining fix sewer and pool pipe leaks without digging. Save your San Antonio backyard.

Luxury Pool Maintenance and Leak Detection for Fair Oaks Ranch Pool Owners



May 20, 2026

Luxury pool maintenance and leak detection for Fair Oaks Ranch estates. South Texas Pool Leak Detection offers pool repair, cleaning, and resurface services.