"One Call" is a free service to inform underground utilities or pipeline owners of any called-in excavation activities that could potentially affect their underground facilities. The facility owner, in turn, provides specific location information to the excavator and marks the underground facility with above-ground APWA (American Public Works Association) color-coded markings.

No digging should occur until a "One Call" center is contacted. Each state has a minimum waiting time of two to three days, or longer for large projects. When digging is very close to the underground utility or pipeline, a company representative may need to stay on site to inspect the activity and protect the underground pipeline.

DIG SAFELY is a campaign led by the government and underground utilities to support communications efforts to raise public awareness of the "One Call" process and how to contact the appropriate center. DIG SAFELY also provides guidance on safe digging practices, including accurately locating and marking pipelines and other underground infrastructures.

Before starting, everyone who digs must call their local One Call Service or 811. If a local call center is unknown, dial 811, and you will automatically be routed to your local One-Call Service. More information regarding 811 can be found at www.call811.com.