Just guesses.
Turn off sprinkler system. Then turn on when you want to water. I would check the meter for gallons used for each zone.
With the sprinkler system off check your meter each hour and see how much water you are using. You can relate this to usage.
The meter might be able to measure in 1/10 gallon increments. If it can you should be able to tell if you have a leak in a few minutes. If you do have a leak turn off the hot water feed to the house and that will tell you if the problem is on the hot or cold (toilets) side of the plumbing.
I would guess the problem has to be in the meter. I would start a log of meter reading. Each hour log your usage. Add some comments on use - did dishes, took shower etc.
Some meters require light to activate the meter dial. Shine a flashlight on the dial even during the day.
You should also be able to turn off the water to the house and leave the sprinkler on. If the meter is moving you have a leak in the sprinkler.
Please let us know what you learn.
|