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I'm going to guess this moaning occurs for less than 5 seconds. It's difficult to tell what the problem is without hearing the sound. This could be due to the pipes shifting and rubbing on the wood...

If you see the meter spinning you are using water somewhere. 6000 gallons is about 5 cups/minute. A toilet with a leaky flapper can use much more than 5 cups a minute. You would probably hear that...