A classic, hence my emphasis and thanks for the link to The Wired article Adam G.

Asked if the fusion center is investigating how information that was uncorroborated and was based on false assumptions got into a distributed report, spokeswoman Bond said an investigation of that sort is the responsibility of DHS and the other agencies who compiled the report. The center’s focus, she said, was on how Weiss received a copy of the report that he should never have received.

“We’re very concerned about the leak of controlled information,” Bond said. “Our internal review is looking at how did this information get passed along, confidential or controlled information, get disseminated and put into the hands of users that are not approved to receive that information. That’s number one.”
So we have an industrial malfunction at a water plant that has nothing to do with cyber warfare, an intelligence assessment circulated widely and maybe beyond it's intended recipients - an assessment that is simply wrong and missed some basic research.

A classic on many levels.