A quarter inch of water loss per day is most likely evaporation. The evaporation rate in your area will depend on humidity, sunlight intensity, barometric pressure, wind and the level of activity in the pool or spa.
After the bucket test is completed, use the pool leak calculator to determine how many gallons you're losing in a 24-hour period, an hour, and even per minute.
If after conducting the bucket test you confirm there appears to be a leak somewhere in your pool contact American Leak Detection of Oregon and SW Washington at 888/777-5325 and schedule a time for one of our technicians to come out. We test leaks and locate on pool & spas and also do repairs on them as well.
http://www.americanleakdetection.com/or-rural-oregon/residential-service Leak Detection