Follow these 5 steps when contacting your local 811 for service. Horizontal Directional What Is 811 | Contractor Notify Utilities Horizontal Directional What Is 811 | Contractor Notify Utilities Step 1. Notify your local one-call center by calling 811 or making an online request 2-3 days before work begins. The one call-center will transmit information … Continue reading Call 811 Overview