It is not possible to reduce the amount of water systems in Step 1 Setup under Buildings & Details. There is a "Deletion Warning" message that will prevent you from removing water systems in this section of LegiDoc. Click the Cancel button. It is possible to delete a water system in a different section however. Follow these steps to delete a water system.
Click the Next button to go to the Process Flow Diagrams section of Step 1 Setup.
Find the water system that you would like to remove. Click the ellipses, and then click Delete Water System.
A pop-up message will ask to confirm that you want to remove this water system. Click Confirm Deletion button.