| Virginia State Corporation Commission Division of Utility and Railroad Safety | http://www.scc.virginia.gov/urs/index.aspx |
| National Safe Digging campaign | http://www.call811.com/ |
| Common Ground Alliance | http://www.commongroundalliance.com/ |
| American Public Works Association | http://www.apwa.net/ |
| Underground Focus Magazine | http://www.underspace.com/ |
| Virginia Department of Transportation | http://www.virginiaDOT.org |