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William Akoto, Assistant Professor of Global Security, American University School of International Service

How hackers attack municipal water systems – and why the utilities are so vulnerable

A July 2026 cyberattack targeted more than 30 water systems in Minnesota municipalities, including Plymouth. AP Photo/Ellen Schmidt

Hackers tried to break into at least 30 municipal water systems in Minnesota on July 26-27, 2026. Since then, Michigan, New Jersey and several other states have reported similar cyberattacks.

The attackers did not try to infiltrate the computers that utility offices use. Instead, they tried to seize control of small computers in equipment like pumps and valves that deliver drinking water to millions of people.

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