811 is the national call-before-you-dig phone number. Anyone who plans to dig should call 811 before digging to request that the approximate location of buried utilities be marked with paint or flags so that you don’t unintentionally dig into an underground utility line. Contact 811 for more information
For Pennsylvania-specific information
Call 811 or 1-800-242-1776 Website:PA OneCall Damage prevention info, local contacts and rules for safe digging in Pennsylvania
Columbia Gas of Pennsylvania uses closed circuit TV to identify possible underground pipeline conflicts in Cranberry. This video from the Gas Technology Institute explains why.