June 4, 2026

Additional Testing of Calvert Cliffs Sirens Scheduled June 3-5

Calvert Cliffs

Additional testing of the Calvert Cliffs Nuclear Power Plant emergency warning sirens is scheduled to take place June 3 through 5, 2026, at various intervals throughout the day.

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

Calvert Cliffs

There will be a full-cycle test of the alert and notification sirens throughout St. Mary’s, Calvert, and Dorchester counties on Monday, June 1, 2026, at noon.

Calvert Cliffs Siren Testing @ noon June 2

Calvert Cliffs

There will be a full-cycle test of the alert and notification sirens throughout St. Mary’s, Calvert, and Dorchester counties at noon Monday, June 2, 2025.

Calvert Cliffs Siren Testing Dec. 2

KI Tablets Calvert Cliffs

There will be a full-cycle test of the alert and notification sirens throughout St. Mary’s, Calvert, and Dorchester counties at noon Monday, December 2, 2024.

Calvert Cliffs Siren Test: Noon June 3

KI Tablets Calvert Cliffs

A full-cycle test of the alert and notification sirens throughout St. Mary’s, Calvert, and Dorchester counties will take place at noon Monday, June 3, 2024.