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Chicago Underground Facilities Damage Prevention Ordinance

Chicago 811 / Digger is a twenty-four (24) hour service network system established to prevent contractors and private citizens from hitting any existing utility line(s) when digging. This agency provides a free One Call service to private contractors and homeowners within the City of Chicago's Corporate Limits.

Click here to download the ordinance authorizing Chicago 811 and the enforcement of the Chicago 811 rules