In Chicago you call 811 Chicago (DIGGER) at least two business days before non-emergency digging, including on your own property. The wait exists so utilities can mark their lines. Skip it and a post hole, footing trench or drain dig can reach a line nobody marked. The fix is the same every time: file the ticket, wait, read the marks, and hand or vacuum dig close to them.
Chicago digging without calling 811 is not a paperwork lapse. It is the shortcut behind most buried line strikes: the shovel, auger or excavator goes into ground where nobody knows what is under it. This article is about how that goes wrong, what the City and state rules say, and how a dig should be run instead. For the rule itself, start with our Chicago DIGGER 811 explainer.
What does the City actually require before you dig?
Chicago's one-call system is 811 Chicago (DIGGER), run by CDOT. It is a free 24-hour service within city limits, and all non-emergency excavation or penetration needs at least two business days of notice, not counting Saturdays, Sundays or holidays. You reach it at 312-744-7000 or by filing an online ticket (City of Chicago).
The City says the wait is there so utilities can mark their facilities in the public way and on private property (City of Chicago). The call applies to homeowners too, private property included (City of Chicago).
State law adds detail. The Illinois Underground Utility Facilities Damage Prevention Act says excavators or demolishers doing non-emergency work must give notice, pre-mark the area, and use hand or vacuum excavation within the tolerance zone near marked lines (220 ILCS 50). In Chicago, the call goes to 811 Chicago, not JULIE, which serves the rest of Illinois. The act was amended in 2025, so confirm the current text if your job depends on it.
How does a Chicago dig go wrong without the call?
This is a typical pattern, not a specific job. An owner or a small crew starts a dig on a Chicago two-flat lot: a fence post line along the gangway, a drain trench, a footing for a new porch or a garage slab. Everyone assumes the utilities run straight in from the street, or that nothing is there because the yard looks empty. Nobody filed a ticket because the job "is only a foot or two deep." Then a bucket tooth or a bar catches a line that nobody marked. The work stops, the neighbors notice, and the question becomes who knew what, and when.
Three things produce that outcome again and again:
- Assuming the route. Lines do not always go where the plan in your head says. Marks, not memory, show where they are.
- Treating "small" as exempt. The City's rule covers all non-emergency excavation or penetration. The call applies to homeowners and to private property (City of Chicago).
- Not leaving time. A two business day wait does not fit a crew that is already booked. The schedule loses, and the call does not get made.
What are the warning signs a dig is about to go wrong?
If you see any of these before the first shovel, stop and file the ticket:
- Nobody can show you the 811 Chicago ticket number for the dig.
- The ground has no utility marks, or the marks are old and faded from an earlier job.
- The crew says "we only go down a foot or two."
- A new porch, fence, footing or drain line is going near the building, the alley or the gangway, and nobody has said where the services enter the house.
- An individual with no general contractor license is running or overseeing work that needs an excavation notice. Chicago permit rules say that individual cannot perform or oversee it (City of Chicago).
Digging also does not always start as a "big" job. The City's permit exemption for grading and excavation covers digs no deeper than 5 feet below grade on private property, or no deeper than 10 feet if the dig is not within 5 feet horizontally of an existing structure or the public way (City of Chicago). That is a building permit threshold. It does not replace the 811 call, which applies to any non-emergency dig.
How is it fixed and how should the dig run instead?
The fix is the same every time, and it is not complicated:
- File the ticket first. Use 811 Chicago at 312-744-7000 or the online ticket, and keep the ticket number with the job (City of Chicago).
- Wait the full two business days. Count only weekdays that are not holidays.
- Read the marks together. Walk the site with the person doing the dig. Photograph the marks before anyone digs.
- Hand or vacuum dig near the lines. The state act points to hand or vacuum excavation inside the tolerance zone (220 ILCS 50). Our hydro excavation article covers vacuum digging.
- Know your ticket. If something looks off, our guide to reading an 811 ticket shows what the ticket tells you.
If a dig does catch a line: stop work, keep people back, and treat any gas smell or hissing as an emergency. Who pays for damage is a legal and insurance question that depends on the facts. Talk to an attorney and to your insurer, not to a contractor's promise.
A struck line is the obvious cost: a stopped job, people at risk, and a repair someone has to pay for. The quieter cost is that a dig done without the call leaves you with no record that you did what the City asks. Rules and consequences change, so confirm current details with 811 Chicago and the Department of Buildings, and talk to an attorney about liability.
For the permit questions around any dig, see whether you need a permit to excavate in Chicago. For the full picture of how the work fits together, our excavation and foundations guide walks it end to end. If you want a dig run with the ticket, the marks and the permit handled up front, our excavation crew can look at your site.
Common questions
You risk hitting a utility line nobody marked, and you will have skipped a step the City requires for all non-emergency excavation. Consequences depend on the facts. Confirm current rules with 811 Chicago and the Department of Buildings, and talk to an attorney about liability.
Yes. The City says the call applies to homeowners and to private property. All non-emergency excavation needs at least two business days of notice to 811 Chicago at 312-744-7000 or through the online ticket.
In Chicago, call 811 Chicago (DIGGER). JULIE is the Illinois one-call system for the rest of the state. See the DIGGER 811 explainer for how the two fit together.
Sources
- City of Chicago: 811 Chicago (DIGGER)
- Illinois General Assembly: Illinois Underground Utility Facilities Damage Prevention Act, 220 ILCS 50/4
- City of Chicago: Guide to Building Permits: General Contractor License FAQ
Facts last checked: October 7, 2026.
This article explains general rules and common situations in Chicago. It is not legal advice, and City rules change. For a specific property, check with the Chicago Department of Buildings or a licensed professional.