Existing hazard types within IQS can be deleted.
Place your cursor over Reference Data and left click on the sub-option Hazard Types.
Find the hazard type that you would like to delete and left click on the Delete button on that line.
A dialog box will appear for you to choose either to delete the record or to not delete.
If the item you are trying to delete is associated with any of the data in the database IQSweb will not allow you to delete the data.