MRC Internal siren tests
and
Contra Costa County Community Warning System
MRC Internal Siren tests
The refinery runs internal tests Mondays between 11:00 am and 12:00 pm to ensure our sirens are operational. During the tests on Monday, sirens will typically be heard by our fence line neighbors and potentially beyond. Testing our sirens ensures we run the refinery to the highest safety standards possible to protect the community, employees, and contract partners.
We have a team of dedicated employees who respond to inquiries 24 hours a day, seven days a week. We invite our neighbors to call our Weekday Phone number at 925-313-3777 or our After-Hours Phone number at 925-313-3601.
CONTRA COSTA COUNTY COMMUNITY WARNING SYSTEM
The Contra Costa County Office of the Sheriff operates the Community Warning System and their website states, “Sirens are tested on the first Wednesday of every month at 11:00am. For the remaining Wednesdays, a more quiet and low “growl” test is performed at 11:00am”.
You can register to receive Community Warning System alerts at cwsalerts.com.
CWS Levels
Level 1
Notification only. Not expected to have off-site health consequences. No community action required.
Level 2
Hazardous materials release, or potential release, expected to have off-site consequences or possible adverse health consequences. Sensitive populations (children, elderly) should limit outside activity.
Level 3
Hazardous materials release, or potential release, expected to have off-site consequences with potential adverse health consequences for the general public. All residents should shelter-in-place and await instructions from City and County officals. CWS sirens are activated.