Federal investigators are examining cyberattacks that struck water systems across Michigan and Minnesota, impacting dozens of facilities amid warnings that Iranian hackers have been targeting critical American infrastructure.

Attacks Hit Critical Infrastructure

Michigan officials confirmed Saturday that nine water systems experienced cyberattacks following a federal alert Tuesday warning of attempts to tamper with operational technology. Dale George, communications director at the state’s Department of Environment, Great Lakes, and Energy, said all affected systems continued operating safely with no public health concerns. Earlier this week, Minnesota reported similar attacks on more than 30 water systems throughout the state, though most incidents involved remote monitoring equipment rather than disruptions to water service.

The FBI declined to publicly identify suspects but acknowledged the investigations Saturday, stating the bureau and interagency partners remain fully engaged to protect critical infrastructure. Last week, federal agencies issued an advisory warning that Iranian hackers have been targeting water and wastewater systems along with operational controls for other critical infrastructure sectors across America.

Local Communities Respond

In Braham, Minnesota, a city of roughly 1,700 residents located 70 miles north of Minneapolis, attackers shut down operating controls at the water treatment plant Monday. City officials asked residents to minimize water use for several hours while the water tower supplied the community. Plymouth, Minnesota, a city of 80,000 near Minneapolis, reported restored water infrastructure communications by Tuesday afternoon following its own cyberattack. Minnesota IT Services confirmed that most attacks targeted technology used to remotely monitor and control equipment.

Iran’s History Targeting American Water

Iranian interest in American water systems extends back years. The Justice Department charged Iranian hackers in 2016 for a cyberattack targeting a small dam near New York City. Digital warfare has become embedded in military conflicts, while local water plants and healthcare facilities often lack funding and expertise to install security patches or implement protective measures. These vulnerabilities make them attractive targets because of both accessibility and the potential for public panic.

Political Tensions Surface

President Donald Trump claimed without evidence Friday during a Camp David Cabinet meeting that Minnesota bore responsibility for the recent attacks, directing criticism at Democratic Governor Tim Walz. The governor responded on social media, suggesting Trump knows who actually launched the attacks. Federal authorities continue investigating the source of both state incidents while water system operators address security vulnerabilities that left critical infrastructure exposed to foreign interference.