Possible pool leak. Losing water.

Jul 3, 2016
3
Livermore, CA
Hi, I have an inground pool made on concrete with gunite( I think) that seems to be losing a lot of water. It is about 18x36, 22,000 gallons in the San Francisco Bay Area. Air temperature has been between 85-95 degrees during the days and about 65 at night. It is often windy. Pool is covered each night. I lost 1 inch of water over 5 days. Is it possible to evaporate that fast or could there be a leak in one of the underground lines? There are no visible leaks on the surface. Pool used daily. Any ideas? Thanks!
 
What is the humidity like there? On days where the humidity is low, there is plenty of room in the atmosphere for water vapor to take up space. The water will evaporate at a much higher rate than days when it is extremely humid. With that being said, an inch over 5 days is about normal.