How to Test for an Inground Pool for a Leak

An inground pool with interior steps can be tested for leaks.

Swimming pool owners often notice the water level has dropped and worry this indicates a leak. In many cases, the water loss is merely caused by evaporation. Use a simple method to check for a pool leak before calling the experts.

Things You'll Need

• 5-gallon bucket

Instructions

1. Place a 5-gallon plastic bucket on the steps leading into the pool. This assumes the pool steps are below the water level and wide enough to stand the bucket on.

2. Carefully fill the bucket with pool water until the water level inside the bucket exactly matches the water level outside the bucket. Do not fill the bucket with water from the tap as you want the water temperature to be the same as the pool water.

3. After 24 hours, check the water level inside the bucket. If it is at the same level as the water outside the bucket, you know the water has evaporated from the pool and the bucket at the same rate. If you are worried about evaporation, use a pool blanket and cover as much of the water's surface as possible.

4. Call a pool repair contractor if the water level inside the bucket is higher than that outside, it is a good indication you have a leak.

Tips & Warnings

• Swimming pools using solar heat or heat pumps elevate the water temperature to extend the swimming season. This causes rapid night time evaporation on cold evenings. Cover the pool when possible to minimize water loss.

References

• American Leak Detection: The Bucket Test
• Marin Municipal Water District: Swimming Pool Tips