Call 811 Call 811

California

California

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


One Call Centers

811 or
800-642-2444

Address:

4005 Port Chicago Hwy
Suite 100
Concord CA 94520

Hours:

24/7

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:

While the marks are reasonably visible with a valid ticket (tickets valid 28 days)
Defines the period of time the facility marks (paint, flags, stakes, etc.) are valid according to state law or practice.
811 or
800-422-4133

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:

While the marks are reasonably visible with a valid ticket (tickets valid 28 days)
Defines the period of time the facility marks (paint, flags, stakes, etc.) are valid according to state law or practice.