Wyoming law requires everyone who owns underground facilities in the state to be a member of One Call of Wyoming.
At least two business days before you intend to dig call 811 (or if you are calling from out-of-state, 1-800-849-2476).
American Petroleum Institute
1220 L Street, NW, Washington, DC 20005
Association of Oil Pipe Lines
1101 Vermont Avenue, NW, Suite 604, Washington, DC 20005
American Gas Association
400 N. Capitol Street, NW, Washington, DC 20001
Interstate Natural Gas Association of America
10 G Street NE, Suite 700, Washington, D.C. 20002
Office of Pipeline Safety
Research and Special Programs Administration, U.S. Department of Transportation
400 Seventh Street, SW, Rm. 7128, Washington D.C. 20590-0001
The National Pipeline Mapping System (OPS/DOT)
Common Ground Alliance
COMMON GROUND ALLIANCE
No mailing address.
Dig Safely (for One-Call Centers)