You should call your water company, they will come and check for leaks for you.
Something similar happened to me,the water company sent someone. They ask you to close all faucets in the house then they monitor the water meter if its registering any water flow. This will tell you if you have sn internal leak somehwere.
Then they start asking you to turn on diffrent systems like irrigation, rodi, ..etc, and see the impact on the water meter to correlate reading.
if indeed it turn out to be a leak,most water companies will give you waive or discount your bill to account for the leak.
In my case it was the water heater
my bill jumped from normal 300$~400$ to 800$.
After I fixed the water heater the water company credited me back 300$
The bill you have is crazy it must be be a leak(big one) or a constant water flow9ng through somewhere.
Keep us posted
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