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From the Schneier on Security blog

According to a report from CISA last week, there were three ransomware attacks against water treatment plants last year.

WWS Sector cyber intrusions from 2019 to early 2021 include:

• In August 2021, malicious cyber actors used Ghost variant ransomware against a California-based WWS facility. The ransomware variant had been in the system for about a month and was discovered when three supervisory control and data acquisition (SCADA) servers displayed a ransomware message.
• In July 2021, cyber actors used remote access to introduce ZuCaNo ransomware onto a Maine-based WWS facility’s wastewater SCADA computer. The treatment system was run manually until the SCADA computer was restored using local control and more frequent operator rounds. ...