Pool Losing Water in the Texas Heat? How to Tell a Leak From Normal Evaporation

Every Texas summer, pool owners notice the water sitting lower than it should and wonder whether something is wrong. The honest answer is that some water loss is completely normal, especially when it has been hot, dry, and windy for a week. The trick is knowing where normal ends and a real leak begins, because the cost of guessing wrong runs in both directions. Panic over evaporation wastes a service call. Ignoring a real leak lets it grow.

Here is how to tell the difference without spending a dime.

What normal evaporation looks like

In DFW heat, a pool naturally loses water to the air. How much depends on temperature, humidity, wind, sun exposure, and how warm the water is. As a rough rule, losing somewhere under two inches over a full week is usually within the range of ordinary evaporation during summer. A spa or a pool with a lot of moving water features will lose a bit more because the extra surface area and agitation speed it up.

Wind is the underrated factor. A breezy, low-humidity afternoon can pull surprising amounts of water off the surface, which is why a pool can look fine one week and lower the next without anything being wrong.

The 48-hour tape test

The simplest check costs nothing. Put a piece of tape on the tile right at the waterline, then leave the pool alone for 48 hours with the equipment running as usual. On a mild stretch the water should sit at or very close to the tape. A small drop on a brutally hot couple of days can still be fine.

What you are watching for is a clear, obvious drop below the tape line over those two days. If the water has fallen well below where you marked it, that is the signal that you are losing more than the weather can account for.

The bucket test for a second opinion

If you want to separate evaporation from a leak more precisely, the bucket test does it. Set a bucket on a pool step and fill it with pool water to within an inch of the top. Mark the water level inside the bucket and mark the pool’s level on the outside of the bucket. Let everything run normally for 24 hours, then compare. Evaporation affects the bucket and the pool about equally, so if the pool dropped noticeably more than the bucket, the extra loss is going somewhere it should not.

The numbers that should get your attention

Volume makes the loss feel real. An average Texas pool around 100 linear feet that drops an inch a day is losing roughly 270 gallons a day. Push that to two inches a day and it is closer to 540 gallons. Over a month at an inch a day, that is nearly 20,000 gallons of water moving out of your pool and into the ground around it. Once you see it in gallons, a “small” leak stops sounding small.

That escaping water is the part that matters most in DFW. It does not simply vanish. It saturates the clay soil under and around the pool, and that is what eventually leads to cracked shells, sinking decks, and in bad cases foundation movement.

When to stop testing and make the call

If the tape test shows a clear drop, the bucket test confirms the pool is losing more than the bucket, or you spot wet ground near the equipment pad on a dry day, it is time for a professional. Detection specialists pressure test the plumbing, listen for escaping water acoustically, use dye to confirm cracks, and check the equipment pad as well as the shell. The point is to find the exact source before any repair, so you are not paying to patch a guess.

If your tests point to a leak, Mr. Pool Leak Repair has located and fixed more than 20,000 leaks across the metro and puts every repair in writing. Catching a leak while it is still small is always cheaper than dealing with what the lost water does to the soil over a season.

Bottom line

Some summer water loss is just Texas being Texas. Run the tape test, back it up with a bucket test if you want certainty, and pay attention to the gallons. Under a couple of inches a week in peak heat is probably the weather. A clear, steady drop beyond that is a leak, and the sooner you find it, the less it costs.