Washington Post: The cybersecurity risk to our water supply is real. We need to prepare.
Their warning is not a theoretical one. In February, a hacker or hackers breached the water-treatment system in Oldsmar, Fla., and attempted to raise the level of sodium hydroxide, or lye, in the water more than 100-fold — from 100 parts per million to 11,100 parts per million. Sodium hydroxide, used to control water acidity, is poisonous at high levels.
https://www.washingtonpost.com/opinions/2022/01/03/cybersecurity-risk-water-supply/