You walk out back on a Saturday morning in Celina, coffee in hand, and something about the pool looks off. The water is sitting a little lower on the tile than it was last weekend. Maybe the skimmer is making that slurping sound it makes when it starts pulling in air. You top it off with the hose, tell yourself it has been hot and windy, and get on with your day.
Then it happens again the next week, and again the week after that.
This is a common worry for pool owners, and it deserves a straight answer. Every pool loses water. Some of that loss is completely normal, and some of it means water is going somewhere it should not. The frustrating part is that from the deck, a pool losing water to the air and a pool losing water into the ground look exactly the same.
At El Dorado Pools®, we are based in McKinney and we serve homeowners in Celina. This post walks through how to tell normal evaporation from a leak, including why your water chemistry is often the first place a leak shows up, a simple test you can run yourself with a bucket, and the electronic equipment professionals use to get the same answer in a fraction of the time.
Every Pool Loses Some Water
Start with the reassuring part. A pool is a large, open body of warm water sitting outside in the sun, and water in that situation evaporates. The question is how much the level drops and whether the amount makes sense for the conditions.
Evaporation depends on a handful of things working together. Heat matters, but so does how dry the air is, how much direct sun the pool gets, and how warm the water is compared to the air above it.
Wind deserves its own mention, because it is one of the biggest factors in evaporation and the one most people underestimate. On a calm day, the air sitting right above the water turns humid and evaporation slows down. A breeze keeps sweeping that damp air away and replacing it with drier air, so the pool keeps giving up water the whole time the wind blows. A mild, windy week can take more out of a pool than a hotter, calmer one, and a pool open to the wind will lose noticeably more than a sheltered pool tucked behind a fence and a row of trees, even if the two are a few streets apart.
How you use the pool matters too. Splashing, swimmers climbing out, and backwashing all remove water, and waterfalls, spillover spas, and a heated pool or spa all speed up evaporation. What is normal for your pool this week depends on your yard, your weather, and your habits, which is why measuring beats any rule of thumb.
Why Celina Pools Can Lose More Water Than You Expect
Celina sits at the northern end of the DFW area, and it gets the same weather that makes pool ownership in North Texas both wonderful and demanding. Summers are long and hot, dry stretches can run for weeks, and the wind is a regular visitor. All three pull water out of a pool, and the wind does more of that work than it gets credit for. If your backyard is open to the breeze, with young trees and not much around to block it, your pool will give up more water than the same pool would in a sheltered, shaded yard.
Fall catches people off guard. The air cools down at night well before the water does, and warm water under cool, dry air evaporates quickly. Homeowners often notice the level dropping in October and assume something broke. It may simply be the season doing what it does. It may also be a leak that happened to show up in October, which is why testing beats guessing.
The ground here deserves a mention as well. Much of North Texas is built on expansive clay soil, which swells when it is wet and shrinks when it dries out. That seasonal movement puts stress on pool shells, decks, and the plumbing lines running underground to your equipment pad. Leaks at fittings and plumbing joints are a real thing in this part of Texas, and a pool that loses water steadily should be checked instead of topped off indefinitely.
Water Chemistry Is Often the First Warning
Long before a wet spot shows up in the yard, a leak tends to show up in the water test. Chemistry that will not stay balanced is one of the leading indicators of a potential leak, and it usually appears before anyone notices the level on the tile.
The reason comes down to what leaves the pool along with the water. When water evaporates, only the water goes. The stabilizer and the salt in a salt pool stay behind, and if anything they become slightly more concentrated. When water leaks out, everything dissolved in it goes too, and the fresh water that replaces it has no stabilizer in it and far less salt. So a pool that keeps losing stabilizer or salt from one week to the next, with no heavy rain, backwashing, or draining to explain it, is telling you that water is physically leaving the pool.
The effects pile up from there. Stabilizer is what protects chlorine from being burned off by the sun, so as it thins out, chlorine stops holding between visits. In a salt pool, falling salt means the chlorine generator produces less. Fresh fill water also shifts pH and alkalinity, so a balance that used to hold for a week needs correcting every time.
That is why a late season algae bloom deserves attention. By October the water is cooling and the sun is weaker, and algae should be getting easier to control. A pool that stayed clear all summer and then turns green or cloudy in fall, with the same care it has always had, is often a pool whose chemistry is being diluted by a leak. Treating the algae clears the water for a while, and then it comes back, because the water feeding the problem is still being replaced.
This is where accurate, consistent testing earns its keep. A pool service company that tests the full set of readings on every visit with proper equipment, and writes the numbers down, has a record to compare against. One odd reading means little. Three weeks of stabilizer or salt falling with no explanation is a pattern, and a technician who sees it should be raising the question of a leak well before the water level gives it away. Chemistry should be the very first indicator that something is wrong.
Without a pool service provider, you do not get that same level of oversight. An owner who tests with strips now and then, or takes a sample to the store when the water looks off, sees one moment at a time with nothing to compare it to. If you look after your own pool, the habit worth adopting is to test the same readings on the same day each week and keep the numbers, so you can see which direction they are moving.
Other Clues That Point Toward a Leak
Chemistry is usually the earliest clue, but there are others worth watching around the pool. None of them proves a leak by itself, but each one tips the odds.
The first clue is consistency. Evaporation rises and falls with the weather, so a pool that loses about the same amount during a cool, calm, cloudy week as it did during a hot, windy one is behaving strangely. Water that escapes through a crack or a bad fitting does not care what the weather is doing.
The second clue is where the water stops. If the level falls and then holds steady at a particular spot, such as the bottom of the skimmer opening, the height of a return fitting, or the edge of a pool light, that spot is worth a close look. Water usually stops dropping once it gets below the opening it was escaping through.
The third clue is around the pool instead of in it. Soggy ground or unusually green grass near the pool, a section of deck that has settled or lifted, or new cracks in the tile line or the coping can all mean water is getting out underground. At the equipment pad, look for drips at the pump, the filter, and the valves, and check whether the pump basket is full of air bubbles.
The last clue is the water bill. A leaking pool is constantly being refilled, so a bill that has crept up without an obvious reason puts the pool on the list of suspects.
One caution for anyone with an automatic fill device. An autofill does its job so well that it can hide a leak completely. The water level never drops, so nothing ever looks wrong. Without regular water testing, the first hint of trouble is a water bill or a soft spot in the yard. If you have an autofill, chemistry and the clues above matter more for you, and you will need to shut it off to test anything.
How to Do the Pool Bucket Test
The pool bucket test is the standard homeowner check, and it works because it compares your pool against itself. A bucket of pool water sitting in the pool sees the same sun, wind, and air as the pool does, so it evaporates at very close to the same rate. The bucket cannot leak, so if the pool loses more than the bucket, the difference went somewhere other than the air.
Here is how to run it. Bring the pool to its normal operating level first, and turn off the autofill if you have one. Fill a plain plastic bucket most of the way with pool water, then set it on a step in the pool so that it sits partly underwater, which keeps the water inside at roughly the same temperature as the pool. If the bucket wants to float or tip, put a brick in the bottom to weigh it down.
Next, make two marks. Use tape or a waterproof marker to mark the water level on the inside of the bucket, and then mark the pool's water level on the outside of the bucket. Take your time, because the whole test comes down to reading small differences against these marks.
Then leave everything alone for a full day. Keep swimmers and pets out, do not backwash, do not add water, and run your pump on its normal schedule. When you come back, compare the two marks. Look at how far the water inside the bucket dropped from its mark, and how far the pool dropped from its mark on the outside.
If both levels dropped by about the same amount, you are looking at evaporation. Your pool is doing what pools do, and the fix is as simple as keeping it topped off or adding an autofill so you do not have to think about it.
If the pool's level dropped clearly more than the level inside the bucket, your pool is losing water some other way, and a leak is the likely explanation. The bigger the gap between the two, the faster the water is escaping.
You can get a little more out of the test by running it twice, once with the pump on its normal schedule and once with the pump off. If the pool loses more with the pump running, that tends to point toward the plumbing that is under pressure when the system is on. If it loses about the same either way, the shell, a fitting, or a light becomes more likely. Treat this as a hint and not a diagnosis.
The bucket test is honest, cheap, and worth doing, but it has real limits. It takes a day at the minimum, and a rain shower in the middle sends you back to the start. Because you are reading marker lines by eye, a slow leak can produce a difference too small to call with any confidence.
How a Leakalyzer Skips the Wait
This is where professional equipment changes things. Pool companies that do leak detection have electronic testing tools built for exactly this question, and one of the best known is a device called a Leakalyzer. We have one at El Dorado Pools.
The idea behind it is simple even though the instrument is sophisticated. A sensor is placed in the pool water, and it measures changes in the water level that are far too small for a person to see against a mark on a bucket. Instead of waiting a day for the level to fall far enough to notice, the equipment tracks very small movements as they happen and shows them as a trend. If the water level is falling faster than evaporation alone would explain, that shows up during a single visit. A professional can bypass the bucket test entirely and move straight to the next question, which is where the leak is.
A fair word of caution belongs here. No instrument makes leak detection automatic. Wind, swimmers, and running water features all disturb the surface, so the pool has to be still for a good reading, and the results need to be interpreted by someone who understands how pools are built and plumbed.
So should you bother with the bucket test at all? If you are curious and patient, yes. It costs nothing and it may put your mind at ease. If your pool is losing water fast, or you have already seen wet ground or cracks, it is perfectly reasonable to skip it and call for professional leak detection.
What Happens After a Leak Is Confirmed
Knowing that a pool leaks is only half the job. The other half is finding where. Dye testing involves releasing a small amount of colored dye near a suspect crack, fitting, or light and watching whether the water pulls it in. Pressure testing isolates individual plumbing lines and checks whether each one holds pressure. A careful visual inspection of the skimmers, returns, main drain, lights, and tile line often finds the problem first.
What the repair looks like depends entirely on what turns up. Some leaks sit right at the skimmer or a return fitting and are sealed without much disruption. Others are in a buried plumbing line and mean opening up a section of deck or yard to reach it. We are not going to quote a price range here, because it varies too much to guess before the leak is located. Our pool repair and equipment service page covers the kinds of repairs we handle.
Why Waiting Costs More Than Testing
It is tempting to treat a slow leak as a nuisance and keep the hose handy. The trouble is that the water you are replacing is the smallest part of the cost.
Water leaving the pool takes your chemicals with it, so you spend more to hold the same balance and the water becomes harder to keep stable. Water escaping underground can wash out the soil that supports your deck and plumbing, and in clay soil it can cause swelling in one spot while the rest of the yard stays dry. If the level falls below the skimmer while you are out of town, the pump can pull air and run dry, which is a quick way to damage it.
The easiest way to catch a leak early is to know your own pool. Notice where the water sits on the tile when the pool is full, take a walk around the deck and the equipment pad every week or two, and above all keep track of the chemistry. Consistent, accurate water testing is the earliest warning you have, and a weekly pool service that tests and records the readings on every visit is in the best position to spot a change first. Our guide to pool maintenance explains what a good weekly routine involves, and our Celina pool service page has more on the area we cover.
Frequently Asked Questions
How much water loss is normal for a pool in Celina?
There is no single number that fits every pool. Normal loss changes with wind, heat, humidity, sun exposure, water temperature, water features, and how much the pool gets used. The reliable way to find out what is normal for your pool is the bucket test, because it measures evaporation in your backyard under your actual conditions. If the pool and the bucket lose about the same amount, what you are seeing is normal for that week.
Can you skip the bucket test and call a professional?
Yes. The bucket test is a useful first step, but nobody requires it. Pool companies that do leak detection, ours included, have electronic equipment such as the Leakalyzer, which measures very small changes in water level and can show whether a pool is leaking during a short visit, without the day or more a bucket test needs. If you have already seen wet spots in the yard, cracks, or a water level that keeps falling quickly, going straight to a professional saves time.
Can algae or unstable chemistry mean a pool is leaking?
Yes, and it is often the earliest sign. A leak replaces treated pool water with fresh water, which dilutes the stabilizer and the salt and makes chlorine harder to hold. The result is chemistry that will not stay balanced and, in many cases, an algae bloom late in the season when algae should be easing off. Accurate weekly testing with the readings written down is what makes the pattern visible, which is why it tends to catch a leak before the water level does.
Get a Straight Answer About Your Pool
A pool that is losing water is asking a simple question, and you do not have to live with not knowing. Watch your chemistry, and run the bucket test this weekend if you want to see for yourself. If the result is unclear, professional leak detection can settle it.
El Dorado Pools is based in McKinney and serves Celina. If you have questions about pool water loss or leak detection, you can reach us at (214) 945-6000 or through our contact page.