The FBI and EPA issued a public service announcement warning water and wastewater sector operators about malicious cyber actors targeting internet-facing Rockwell Automation MicroLogix 1100 and 1400 series PLCs. Since July 27, 2026, utilities in at least seven states reported incidents where attackers altered IP addresses and passwords, disrupting operations and causing pressure loss or flooding in some cases. The agencies recommend isolating PLCs from direct internet exposure, using secure gateways, strong passwords, and access control lists to restrict unauthorized communication. They also advise maintaining manual operation capabilities, reviewing project files for changes, and replacing end-of-life equipment to mitigate risks. Affected organizations are urged to report incidents to local FBI offices or IC3.
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