Calvert Cliffs Testing Sirens on June 1, With More Testing Later in the Week

There will be a full-cycle test of the Calvert Cliffs Nuclear Power Plant emergency warning sirens throughout St. Mary’s, Calvert, and Dorchester counties on Monday, June 1, 2026, at noon.

Additional testing is scheduled to take place Wednesday, June 3, through Friday, June 5,
at various intervals throughout the day.

This includes a three-minute activation of all sirens within the 10-mile area around Calvert Cliffs Nuclear Power Plant. All citizens should be aware of this scheduled testing and relay this information to friends, family, and neighbors.

The testing is conducted to check siren operation and increase public awareness of the alert and notification siren system. If the sirens sound at any other time, residents should tune in to one of the local radio stations for information and instructions.

Knowing what to do before, during, and after an emergency is a critical part of being prepared and may make all the difference when seconds count.

To learn more about how you can be prepared and stay informed, go to:

• www.stmaryscountymd.gov/ema
• www.calvertcountymd.gov/101/Emergency-Management
• www.dorchestercountymd.com/emergency-management-division