Call 811 Call 811

California

California

Explore damage prevention information, local contacts and rules for safe digging in California.


One Call Centers

811 or
1-800-227-2600

Address:

4005 Port Chicago Hwy
Suite 100
Concord CA 94520

Hours:

M - F 0600 - 1900

Advance Notice:

Minimum 2 working days with a maximum of 14 calendar days
Number of days in advance of a digging project that you need to notify the one call center of your intent to dig.

Marks Valid:

28 days or when they are no longer reasonably visible
Defines the period of time the facility marks (paint, flags, stakes, etc.) are valid according to state law or practice.
811 or
1-800-227-2600

Address:

PO Box 77070
Corona CA 92877

Hours:

M - F 0600-1900

Advance Notice:

2 working days but not more than 14 calendar days
Number of days in advance of a digging project that you need to notify the one call center of your intent to dig.

Marks Valid:

28 days
Defines the period of time the facility marks (paint, flags, stakes, etc.) are valid according to state law or practice.