I’d be very curious to know of any SCADA system that is connected to the internet.
I know of several Water Treatment Plants that are connected 24/7/365 with very minimal Firewall/Hard disconnect. I’m talking about Plants for Municipalities that treat anywhere from 2 MGD to 100 MGD (Million Gallons a Day).
I’d be willing to say that if I downloaded a very commonly used Remote Access Software package and spent 20-30 minutes I could “walk” right in to their SCADA and control the entire Plant, Chemical Dosage Pumps and the connected Remote Pump and Storage Tank Sights. I could do anything from shut the Plant down, make Chemical adjustments to cause sickness, over or under fill storage tanks or even over pressure the distribution lines and cause ruptured lines in one or more locations.
It’s a good thing that I have scruples...