What can cause a 500+ gallon leak for 3 hrs - then stop. This happened 3 times in 3 months

[stevedawg85]

Water company says I have high peaks of usage, but it only occurs on random days and then 'fixes' itself. No pattern.
Ex. 500 gallons in 3 hrs, another instance is 900 gals in 3 hrs, another is 520 gals in 2 hrs.
I turned off my pool autofiller. I turned off sprinkler system. I have cameras to watch outside hoses, no one is using it. No soft water or any gizmo filtration system.
Inside and outside of house shows no water damage or wet ground. Toilets are not running.

What else should I be on the lookout for. How else can I troubleshoot or identify the cause? Can a plumber identify the cause if it only happens on random days?

 

[havasu]

Replace your meter.

 

[Geofd]

Shut off your water meter write the numbers down , check it again a couple of hrs later

 

[Twowaxhack]

Do you have a digital meter that sends the data via radio signal to the water company ?

 

[stevedawg85]

@Geofd but my "leak" randomly occurs at different times and different days. My billing company provides me the hourly breakdown, and it is just a 3 hr span and then it 'fixes' itself

@Twowaxhack Yes to both.

 

[BlueSkyHigh]

@Twowaxhack Yes to both.

Possibly a “bingo” moment. Get them to R&R the meter.