811 - Call Before You Dig

This service notifies all of your utilities to locate the underground infrastructure. The Utility Notification Center is available 24/7 and is free of charge. It's the Law.  Dial 811 from a telephone. 

811 Logo Shovel with Know what’s below. Call before you Dig.


For more information on the process- 

Learn what each color represents - 

Interactive Map

King County has an interactive map for a visual example that helps explain what you can expect to be located.

Diagram Showing How a Service Line Connects to a Residence