 If a big outdoor project is part of your future plans, before you start digging, call 811. Within 72 hours, your underground utilities will be located and marked, and you'll know exactly where it's safe to dig. A quick phone call is all it takes, and there's no charge to find out where potentially dangerous underground cables and lines are located. Before you grab a shovel or start digging in the yard, call 811 at least three business days before digging. Remember, if it requires a shovel, it requires a call to 811.