America’s Drinking Water Is Surprisingly Easy to Poison

On Feb. 16, less than two weeks after a mysterious attacker made headlines around the world by hacking a water treatment plant in Oldsmar, Florida, and nearly generating a mass poisoning, the city’s mayor declared victory.

“This is a success story,” Mayor Eric Seidel told the City Council in Oldsmar, a Tampa suburb of 15,000, after acknowledging “some deficiencies.” As he put it, “our protocols, monitoring protocols, worked. Our staff executed them to perfection. And as the city manager said, there were other backups. ... We were breached, there’s no...