https://www.nytimes.com/2021/02/08/us/oldsmar-florida-water-supply-hack.html
Hackers remotely accessed the water treatment plant of a small Florida city last week and briefly changed the levels of lye in the drinking water, in the kind of critical infrastructure intrusion that cybersecurity experts have long warned about.
the level of sodium hydroxide — the main ingredient in drain cleaner — was changed from 100 parts per million to 11,100 parts per million, dangerous levels that could have badly sickened residents if it had reached their homes.