1. Login into your WHM Control Panel.
2. At the left side menu, click Account Information.
3. Following, you may click Show Accounts Over Quota.
4. Lastly, you will reach the current page, in this page it will only show you those accounts with over
quota only, if there is no account with over quota it will just label No users are over their quota.
Note:
You can also set the limit of quota use for your user, so that if your user overuse the limit of the quota, then you may figured it out. For more information you can go to :