06/04/2026
5/26/26 UPDATE: Additional Testing of Calvert Cliffs Nuclear Power Plant Sirens Scheduled for June 3-5, Following June 1 Full-System Test.
🚨 A full-cycle test of the Calvert Cliffs Nuclear Power Plant alert and notification sirens will take place on Monday, June 1, 2026, at noon across St. Mary’s, Calvert, and Dorchester counties.
🆕 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.
This scheduled testing helps ensure the siren system is operating properly and increases public awareness of emergency notification procedures.
If sirens sound at any other time, community members should tune in to local radio stations for official information and instructions.
Preparedness matters — knowing what to do before, during, and after an emergency can make all the difference when seconds count.
🔗 Learn more and prepare for potential emergencies: www.stmaryscountymd.gov/em
ℹ️ Full News Release:https://www.stmaryscountymd.gov/pio/docs/2026-117NewsReleaseSirenTesting.pdf
🆕 5/26/26 UPDATE ON ADDITIONAL TESTING:https://www.stmaryscountymd.gov/pio/docs/2026-119NewsReleaseSirenTesting.pdf
Calvert County Government, Calvert County, Maryland Dorchester County - Government St Marys County, MD St. Marys County Maryland Maryland Emergency Management Association St. Mary's County Sheriff's Office Maryland State Police Leonardtown Barrack Naval Air Station Patuxent River