Pool Water Evaporation

by Amy
(Westminster, MD)

My pool is a 15 x 30 and 4 feet deep. I live in Maryland and was wondering what the normal rate of evaporation is for pool water. I seem to lose almost 1/4 of an inch of water every day. Is that normal?


Hi Amy. That does sound about normal for this time of year. There is a real easy way to find out for sure if that amount is correct. You would need a bucket and a marker, pen, sharpie, magic marker of whatever. Fill the bucket with water and set by the pool. Mark the water level in the bucket and mark the water level of the pool by placing a line on the skimmer faceplate. In a couple of days mark the water levels again. The distance between the lines in the bucket should be the same as in the pool.

It's very simple but it does work and it is accurate.



If it does appear you have a leak start with the two most obvious ways of finding it. A hole around the outer edge of the pool will leave a wet spot around the outside of the pool. Examining the ground around the pool is the first step.

A hole in the center area of a vinyl pool will usually leave a mushy spot, easily felt while walking around in the pool. A slow walk around in the pool is the second step to finding a leak.