Call 811 Call 811



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

One Call Centers



4242 – 7 St SE Suite 104
Calgary AB T2G 2Y8


M - F 0600-2000 Emergency 24 / 7

Advance Notice:

At least 2 full working days, but not more than 10 full working 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:

14 days, may be extended to 30
Defines the period of time the facility marks (paint, flags, stakes, etc.) are valid according to state law or practice.