State law requires you call the Gopher State One Call center at 651-454-0002 or 800-252-1166 or simply 811 before you begin digging. All utilities (electric, phone, cable TV, gas) will locate their facilities within 48 hours of your call to the center. This is a free service. They do require 48 hours notice.
Check out our "Call Before You Dig" section for more information.