Planning to dig for a new sewer line, water main, or septic system in Illinois? You’ll likely need a plumbing permit for excavation—and skipping it could cost you thousands in fines or even force you to redo the work. Whether you’re a homeowner or a contractor, this guide walks you through exactly how to get a plumbing permit for excavation in Illinois, legally and efficiently.
Why Do You Need a Plumbing Permit for Excavation in Illinois?
In Illinois, any excavation that involves plumbing systems—like installing, repairing, or replacing underground pipes—requires a plumbing permit. This isn’t just bureaucracy; it’s public safety.
According to the Illinois Department of Public Health (IDPH), unpermitted plumbing work is a leading cause of groundwater contamination and sewage backups. In 2023 alone, Cook County issued over 1,200 violation notices for unpermitted excavation near utility lines.
A permit ensures your project:
- Complies with the Illinois Plumbing Code (based on the IPC – International Plumbing Code)
- Doesn’t damage existing utilities (gas, electric, telecom)
- Meets depth, slope, and material standards for safe wastewater flow
💡 Fun fact: In Chicago, 78% of plumbing-related excavation fines in 2024 were due to missing permits—not faulty work.
Step-by-Step: How to Get a Plumbing Permit for Excavation in Illinois
The process varies slightly by municipality, but here’s the general workflow used by most Illinois counties (including Cook, DuPage, and Lake):
Step 1: Confirm If You Need a Permit
Not all digging requires a plumbing permit. You do need one if your excavation involves:
- Installing or replacing sewer or water lines
- Connecting to public mains
- Building a new septic tank or leach field
- Digging deeper than 18 inches near existing plumbing
You don’t need one for:
- Minor landscaping (e.g., planting trees)
- Replacing a faucet or indoor fixture (no excavation)
Check your local building department’s website—or call them directly.
Step 2: Contact Your Local Building Department
Permits are issued at the city or county level, not state-wide. For example:
- Chicago: Apply via Chicago Buildings
- Naperville: Use the Online Permit Portal
- Springfield: Visit the Office of Building Safety in person
⚠️ Tip: Always call before you dig—dial 811 (Illinois’ “Call Before You Dig” service) to locate underground utilities. It’s free and required by law.
Step 3: Prepare Required Documents
Most jurisdictions require:
- Completed plumbing permit application
- Site plan showing excavation area, pipe routes, and property lines
- Plumbing drawings (signed by a licensed plumber if required)
- Proof of contractor license (if hiring a pro)
- Payment for permit fees
Typical Fees (2026):
| Location | Base Fee | Additional Costs |
|---|---|---|
| Chicago | $150–$300 | $50/linear ft for sewer lines |
| Suburban Cook | $100–$200 | Inspection fees ($75–$125) |
| Downstate IL | $75–$150 | Minimal extras |
Fees vary based on project scope and pipe length.
Step 4: Submit Application & Pay Fees
Submit online (preferred) or in person. Processing takes 3–10 business days in most areas. In Chicago, expedited review is available for an extra fee.
Step 5: Schedule Inspections
After approval, you must schedule two inspections:
- Pre-backfill inspection: Before covering trenches
- Final inspection: After restoration
Miss either, and your permit becomes invalid.
Step 6: Keep Records
Retain your permit number and inspection reports. You’ll need them if you sell your home or apply for future permits.
Common Mistakes to Avoid
Even experienced contractors slip up. Here’s what not to do:
❌ Assuming rural areas don’t require permits
→ Even small towns like Carbondale enforce plumbing codes strictly.
❌ Starting work before permit approval
→ Fines can reach $1,000/day in cities like Evanston.
❌ Using non-approved pipe materials
→ Illinois requires Schedule 40 PVC or cast iron for underground drainage—no flexible corrugated pipe unless approved.
❌ Ignoring setback rules
→ Sewer lines must be at least 10 feet from property lines and 50 feet from wells (per IDPH guidelines).
For more on plumbing standards, see the International Plumbing Code overview on Wikipedia.
Illinois Plumbing Permit Requirements by Region
| City/County | Online Application? | Contractor License Required? | Typical Wait Time |
|---|---|---|---|
| Chicago | Yes | Yes (for >$500 work) | 5–7 days |
| Aurora | Yes | No (for homeowners) | 3–5 days |
| Peoria | No (in-person only) | Yes | 7–10 days |
| Champaign | Yes | Optional for DIY | 4–6 days |
Always verify with your local office—rules change frequently.
FAQ Section
Q1: Can a homeowner pull a plumbing permit for excavation in Illinois?
Yes, in most Illinois municipalities, homeowners can apply for their own permits if they’re doing the work themselves. However, some cities (like Chicago) require a licensed plumber to sign off on plans for sewer or water main connections.
Q2: How deep can I dig without a permit in Illinois?
There’s no universal “safe depth.” If your digging affects plumbing—even at 12 inches—you likely need a permit. Always check with your local building department first.
Q3: What happens if I dig without a plumbing permit?
You risk:
- Stop-work orders
- Fines ($500–$5,000+)
- Forced excavation reopening for inspection
- Liability for utility damage (e.g., hitting a gas line)
Q4: How long is a plumbing excavation permit valid in Illinois?
Most permits expire after 180 days if work hasn’t started. Once work begins, you usually have 1 year to complete it. Extensions may be granted for weather or supply delays.
Q5: Do I need a separate excavation permit AND a plumbing permit?
Usually no. In Illinois, the plumbing permit covers excavation related to plumbing systems. However, if you’re also doing structural work (e.g., foundation digging), you may need an additional building permit.
Q6: Can I apply for a permit after I’ve already dug?
Technically, yes—but it’s risky. Inspectors may deny retroactive permits if work doesn’t meet code. You might have to dig it all up again. Better to apply first.
Conclusion
Getting a plumbing permit for excavation in Illinois isn’t just red tape—it’s your legal and ethical responsibility to protect your property, neighbors, and environment. By following these steps, you’ll avoid costly mistakes, ensure code compliance, and complete your project with confidence.
✅ Save time
✅ Avoid fines
✅ Ensure safety
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Disclaimer: Regulations vary by municipality. Always consult your local building department before starting any excavation project.
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