The bucket test answers this question in 24 hours. Here is how to do it correctly and what the results actually mean.
Call (954) 290-5177 for a Free Estimate →Do a bucket test. Fill a 5-gallon bucket with pool water and set it on a pool step so it sits partially submerged. Mark the water level inside the bucket and the pool level outside it. Turn off the autofill and wait 24 hours without adding water. If the pool dropped significantly more than the bucket, the pool is leaking. If both dropped the same amount, it is evaporation. In South Florida, normal evaporation is about one quarter inch per day, any consistent loss above that points to a leak.
Evaporation affects both the pool and the bucket equally. They are both exposed to the same sun, wind, and humidity. So if the pool is only evaporating, both should drop by the same amount over 24 hours.
A leak only affects the pool, not the bucket. So if the pool drops half an inch while the bucket only drops a quarter inch, the pool lost an extra quarter inch that cannot be explained by evaporation. That extra loss is the leak.
Partially submerging the bucket on a pool step equalizes the water temperature between the bucket and the pool, which makes the comparison more accurate. If the bucket sat outside the pool entirely, the temperature difference could skew the evaporation rates slightly.
The pool dropped noticeably more than the bucket, even half an inch more. The difference is the pool leaking. The larger the difference, the more the pool is losing.
Both the pool and the bucket dropped about the same amount. The loss is environmental, sun, wind, and heat, not a leak in the pool or plumbing.
The autofill must be turned off during the bucket test. If the autofill is running, it keeps replacing the water the pool is losing, so the pool level stays the same and the test cannot detect anything. Turn off the autofill valve or breaker before you mark the starting levels and leave it off for the full 24 hours.
This is the most common reason a bucket test gives a false result. Homeowners run the test with the autofill on and conclude the pool is fine because the level did not drop, when in reality the autofill replaced 400 gallons overnight and masked a significant leak.
If your bucket test shows the pool is leaking, the next step is professional leak detection. A licensed specialist can find the source without draining the pool or cutting concrete first. At Leak and Subsurface Locators, we use acoustic hydrophones, pipe testing, dye testing, and trace gas to locate leaks in the shell, plumbing, skimmer, pool light, and underground pipes.
The bucket test is simple but it has to be done right. Turn off the autofill. Use pool water in the bucket, not tap water. Put the bucket on a step so it sits in the pool water. Wait the full 24 hours. I have had homeowners call who ran the test for six hours and could not tell anything. Six hours is not enough to see a quarter inch of difference reliably.
If the test shows the pool is losing more than the bucket, call us. We will ask a few questions, look at photos if it helps, and give you a price before we schedule. There is no guessing on our end about what it will cost.
Free tools from Leak Business Academy
Use the Leak Analyzer to score your symptoms, the Evaporation Calculator to check if your loss is normal, and download the free beginner guide to understand what a professional detection visit looks like.
Evaporation Calculator → Leak Analyzer → Free Beginner Guide →Leak and Subsurface Locators finds pool leaks throughout South Florida without draining or digging first. Licensed under CPC1457277. Free estimate before we schedule.
Broward (954) 290-5177 (561) 325-2678 (561) 325-267824 hours is the standard. Less than that and the difference may be too small to read accurately. You can run it for 48 hours for an even clearer result, especially if the loss is slow.
Run the pump on its normal schedule. If you want to check whether the leak is worse with the pump on or off, run one 24-hour test with the pump running and one with it off. The difference between the two results tells you which side of the plumbing the leak is on.
If both dropped the same large amount, it was likely a very hot, windy day and the loss is evaporation. If you are concerned, repeat the test on a calmer day. If the pool consistently drops more than the bucket, it is leaking regardless of how much both dropped.
Absolutely. If you already know the pool is losing too much water and you want it confirmed and located professionally, skip the bucket test and call us directly. We will assess it during the leak detection visit.