St. Mary’s County Government’s Department of Emergency Services (DES) is advising residents that additional testing of the Calvert Cliffs Nuclear Power Plant emergency warning sirens is scheduled to take place Wednesday, June 3 through Friday, June 5, 2026, at various intervals throughout the day. The additional testing follows the previously announced semi-annual full-volume siren test scheduled for Monday, June 1, 2026, at noon. The...
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