811 In Your State


Explore damage prevention information, local contacts and rules for safe digging in Pennsylvania.

Logo of Pennsylvania One Call System, Inc.

Pennsylvania One Call System, Inc.
811 or 800-242-1776

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925 Irwin Run Road
West Mifflin, PA 15122

24 / 7

Advanced Notice: Construction phase - 3 to 10 business days; Design phase - 10 to 90 business days
Number of days in advance of a digging project that you need to notify the one call center of your intent to dig.

Marks Valid: as long as equipment is kept on site
Defines the period of time the facility marks (paint, flags, stakes, etc.) are valid according to state law or practice.