The Brief Clayton County Water Authority operational systems in north Clayton County faced cyber activity, causing service disruptions last Monday. Federal investigators have joined the hunt for the person or group responsible for a cyber incident in Clayton County’s drinking water system. Water service disruptionWhat we know:The cyber threat triggered operational disruptions and water pressure drops across parts of north Clayton County on last Monday. The Clayton County Water Authority restored service within hours and later cancelled a precautionary boil water advisory after water-quality testing proved the supply met safety standards. More than four dozen water systems in Minnesota and Michigan were reportedly impacted, but that number could rise.