Professional leak detection in DFW typically runs $350 to $600, with $395 flat a common published rate and some specialists at $500 to $700. The fee buys a location and a diagnosis, and the repair is quoted separately once the leak is found.
That’s a real amount to spend on finding a problem rather than fixing it, so the useful question is when it’s worth paying for. A free bucket test comes first, because roughly half the pools we’re called about are evaporating normally. Once water is escaping underground, though, guessing gets more expensive than knowing.
Rule out evaporation first
Normal evaporation in a North Texas summer is around half an inch a day, double the quarter inch repeated online, which comes from milder conditions than ours. The National Weather Service’s Dallas/Fort Worth climate narrative describes ours: “during the peak summer months of July and August … daytime temperatures are consistently in the 90s, often reaching or exceeding 100 degrees.” Heat like that, with sun and wind on open water, is why a pool can drop fast with nothing wrong. On a 15-by-30-foot pool half an inch is roughly 140 gallons a day, or close to a thousand gallons a week. A water feature, a heated pool, a windy yard, splash-out, and backwashing a sand filter all add to it.
The bucket test settles the question in 24 hours for the price of a bucket. Fill a five-gallon bucket with pool water and set it on the second step so it’s partly submerged. Mark the water level inside and the pool level outside, turn off the autofill, and wait a day. If both dropped by the same amount, it’s evaporation. Full instructions, including the second run with the pump off that tells you which side of the system to suspect, are in our leak-or-evaporation guide.
The autofill problem
An autofill valve keeps the level constant no matter how much water is escaping, so the falling level you would normally notice doesn’t appear. The leak shows up on the water bill instead, months later, and by then it has also been diluting your chemistry and washing soil out from under something. If you have an autofill, turn it off for the duration of the bucket test, and treat any unexplained jump in water usage as worth investigating rather than as a billing error.
Refilling a pool that is losing water isn’t restricted the way irrigation is. The City of Plano requires no variance to fill a pool, and its watering schedule governs sprinklers rather than pools, so a rising bill from a leak is a cost problem rather than a compliance one. Rules differ across the county, so check your own city.
What detection costs here, and what you get
| Structure | Typical range | Notes |
|---|---|---|
| Flat rate detection | $395 is a common published figure | Usually covers a defined scope: shell and accessible plumbing |
| Typical market range | $350 to $600 | Varies with pool size and how much plumbing is involved |
| Higher-end specialists | $500 to $700 | Often includes more extensive pressure testing |
| Repair | Quoted separately | The variable that matters most, and it depends entirely on where the leak is |
The repair row is where the misunderstanding usually happens. A split in above-ground plumbing at the pad is an inexpensive fix, while the same volume of water escaping from a line under a concrete deck is a different number, because somebody has to get to it.
What a detection visit involves
- Isolating the system. Plugging returns and skimmer lines to determine whether the loss is in the shell or the plumbing, which is the first fork in the road.
- Pressure testing individual lines. Each line is pressurized and watched. A line that won’t hold pressure has the leak.
- Acoustic listening. Sensitive microphones pick up the sound of water escaping under pressure, which is how a leak gets located to a spot rather than to a line.
- Dye testing. For shell leaks, cracks, light niches, and skimmer throats, where dye released near a suspect point either gets drawn in or doesn’t.
- Camera inspection. For lines large enough to accept one.
A good visit ends with a specific location, a photograph, and a repair recommendation you can take to anybody. A visit that ends with “somewhere in the return line” isn’t a finished job.
Where leaks happen in North Texas
Two local conditions drive North Texas pool leaks, and neither is about pool quality.
Expansive clay
Collin County clay swells when wet and shrinks hard when dry, and that annual movement works on rigid PVC, on the joints where fittings meet the shell, and on the deck. A pool that has been through fifteen summers here has been flexed fifteen times. What clay soil does to a pool covers the wider effect.
Freeze damage on a delay
Water left in a line during a hard freeze splits it, but the split frequently doesn’t become a visible leak until the system is pressurized again, so plenty of leaks found in April were made in January. Spotting freeze damage after the thaw covers the inspection.
Beyond those two, the usual suspects are ordinary: skimmer throats where the plastic meets the shell, light niche conduits, return fittings, and the equipment pad itself, which is the one place you can see.
When to pay for detection, and when not to
Calling a specialist straight away is faster, and when a deck is settling, speed wins. Otherwise the bucket test and a look at the pad decide it.
| Situation | Worth paying? | Why |
|---|---|---|
| Bucket test shows equal loss | No | You don’t have a leak. Fix the expectation, not the pool. |
| Losing a quarter inch a day more than the bucket | Usually yes | That’s thousands of gallons a month and it won’t improve on its own |
| Loss changes when the pump runs | Yes | That’s a strong diagnostic signal and it points at plumbing, which you can’t see |
| Visible wet spot at the pad | Not yet | You may have already found it. Have somebody look at the pad first. |
| Soggy patch in the yard or a settling deck | Yes | An underground leak washing out soil is doing structural damage while you wait |
| About to resurface or replaster | Yes | Finding a plumbing leak after the new surface goes on is the expensive order to do it in |
| Small loss, old pool, selling next spring | Judgment call | Disclosure matters, and a documented leak with a quote is easier to negotiate than a vague one |
Do the cheap eliminations first
Before booking anybody: run the bucket test with the pump on, then again with it off. Check the equipment pad for wet concrete on a dry day. Check whether the loss started right after a freeze or right after a rainy spell. Look at whether the water stops falling at a particular level, which points at a leak at that exact depth, usually a light niche, a return, or a skimmer throat. Those four observations cost nothing and they shorten a detection visit, which sometimes shortens the bill.
What an unfixed leak costs
- Water. A quarter inch a day above evaporation on a normal pool is thousands of gallons a month, metered.
- Chemicals. Every gallon that leaves takes your chlorine and stabilizer with it, and every gallon that replaces it arrives hard and unbalanced.
- Heat. If you heat the pool, you’re heating water into the ground.
- Soil. The expensive one. Water escaping underground washes fines out from beneath decks, coping, and eventually the shell itself, and that damage doesn’t reverse when the leak is fixed.
Soil loss is why a $400 detection fee on a leak that is quietly undermining a deck is the cheapest part of the problem.
What the repairs run once it is found
- At the pad, above ground. The cheap outcome. A coupling, some pipe, an hour.
- A skimmer throat or a return fitting. Moderate, and often fixable without breaking concrete.
- A light niche or conduit. Moderate, occasionally awkward.
- A line under the deck. Now it is a project. Either cut and patch the concrete, or reroute the line around it, which is frequently the better value.
- A crack in the shell. Depends on whether it is a surface craze or a structural crack, which are different conversations.
Our repair cost guide covers the plumbing side, including why the same split costs different amounts depending on where it is.
Where we fit
We’re a pool service company rather than a dedicated leak detection outfit. We handle the part in front of detection. We confirm whether the pool is losing water at all and check the equipment pad, where a meaningful share of leaks turn out to be, then tell you whether a specialist is warranted. That’s what our leak detection service covers, and where the job needs full acoustic and pressure work on buried lines, we’ll say so rather than guessing at your expense.
If you’re unsure where to start, start with the bucket test tonight. Roughly half the calls we take about water loss end there, and a bucket, a strip of tape, and one quiet day answer the question that a $400 visit would otherwise have to.
