Iranian cyberattacks on US water systems

In late July and early August 2026, a series of cyberattacks targeted water and wastewater systems in multiple U.S. states, primarily United States — Minnesota and United States — Michigan. United States — Minnesota reported over 30 water systems affected, while United States — Michigan reported nine. The attacks involved unauthorized access to operational technology, including programmable logic controllers, causing disruptions such as the shutdown of a water treatment plant in United States — Braham, Minnesota, United States — Minnesota. Federal agencies, including the FBI and CISA, issued advisories attributing the attacks to Iranian hackers, though the FBI has not publicly confirmed the culprit. President Donald Trump, during a Cabinet meeting at Camp David, blamed United States — Minnesota Governor Tim Walz and state leadership for the attacks, a claim Walz disputed. No water quality issues or public health impacts were reported, and all systems continued to operate safely.