Water bill is crazy high

G'day ledges

Just wondering if anyone out there can shine a light on my crazy water bills. I live in a town house with my partner and two kids under 8. No gardens, nothing that uses water. We are using 600L a day (approx $530 a quarter), over double my cities average.

We hand wash out dishes by leaving the tap running and using a dish wand. That's the only thing I could imagine that might add a bit of usage but double seems crazy!

Any ideas welcome

Cheers