The State of Oregon requires anyone, even homeowners, who plan to dig or excavate to have all utilities in the work area located.

For free utilities location call...

"Oregon Utility Notification Center" Statewide Toll Free: 1-800-332-2344

Call at least 48 hours in advance. After receiving a call the Oregon Utility Notification Center notifies all of the utilities that have lines in the area of notification that they will need to locate and mark the whereabouts of their underground utilities.
Various utilities have service lines buried at different levels which makes it very important to to call before you start any project that requires digging.