The Pool Bucket Test
Is your pool really leaking, or is it just evaporation? This simple DIY test will tell you in 24–48 hours.
Evaporation vs. a Real Leak
All pools lose some water to evaporation — especially in Southern California's warm, dry climate. A pool can naturally lose up to ¼ inch of water per day through evaporation alone.
But if you're losing significantly more than that, you likely have a leak — and a small leak left untreated can cost you thousands in water bills and cause serious structural damage over time.
The bucket test is the simplest, most reliable way to tell the difference. You can do it yourself in about 5 minutes, and you'll have your answer in 24–48 hours.
⚠️ Important: Run this test with the pool pump on its normal schedule. A test with the pump off can give misleading results if you have a suction-side leak.
The Bucket Test
Find out if your pool is really leaking — or just losing water to evaporation.
Grab a 5-gallon bucket
Make sure your pool is filled to its normal operating level.
Place bucket on the 2nd step
Fill it until the bucket's water level matches the pool's. Mark both lines.
Turn OFF the auto-fill
Keep the pump on its normal schedule — just disable auto top-off.
Evaporation affects pool and bucket equally. Only a leak drops the pool faster.
How to Do the Bucket Test
You'll need: a 5-gallon bucket, a marker or tape, and 24–48 hours.
Fill the Bucket
Fill a 5-gallon bucket with pool water to about 1 inch from the top. This ensures the bucket water is the same temperature and composition as your pool water, which keeps evaporation rates equal.
Place the Bucket in the Pool
Place the bucket on the first or second step of your pool, submerged just enough so the water inside the bucket is at the same level as the pool water outside. Do NOT let the bucket float — it needs to sit on the step.
Mark Both Water Levels
Use a piece of tape or a waterproof marker to mark the current water level on the inside of the bucket (bucket water level) AND the current pool water level on the outside of the bucket or on the pool wall. Take a photo for reference.
Wait 24–48 Hours
Leave the bucket in place for 24 to 48 hours. Keep the pool pump running on its normal schedule. Do not add water to the pool during this period. Avoid running the test during rain.
Compare the Water Levels
After 24–48 hours, compare the drop in the bucket water vs. the drop in the pool water:
Other Signs Your Pool Is Leaking
Beyond the bucket test, watch out for these common indicators that your pool has a leak:
When the Bucket Test Shows a Leak
If your bucket test confirms a leak — or if you're still unsure — it's time to call in a professional. Here's why a DIY approach has limits:
Leaks Are Often Hidden
Most pool leaks are underground in plumbing or behind the shell — invisible to the eye. Professional sonar technology equipment is the only way to find them without digging.
Multiple Leaks Are Common
Fixing one leak only to find another is frustrating and expensive. Our 5-point analysis checks every possible leak source in a single visit.
Small Leaks Become Big Problems
A leak that loses just ½ inch of water per day wastes over 10,000 gallons per month. Left unchecked, it can erode soil, undermine your pool shell, and cost thousands in structural repairs.