Thank you both very much! I will check out the pump to see if there is any water under it. The electric bill did go from roughly 3200 KW hours same time last year (before the pool) to about 4900 KW this year. I'll continue to compare the differences between electricity usage.

I'm relieved to know it may be easy to fix. First though, I've got to get the builder to find and fix the leak. They're currently working on a small leak they found in the water feature, but there's no way I'm losing this much water from that little leak.