A hacker remotely accessed the computer system the operator was monitoring that controls chemical levels in the water as well as other operations. The operator observed the mouse moving around on the screen to access various systems that control the water being treated. The hacker tried to poison the town’s water supply by raising the levels of sodium hydroxide, or lye, in the water supply.
Read more about this article here: https://threatpost.com/hacker-tries-to-poison-water-supply-of-florida-town/163761/