Do You Need a Plumbing License for Septic Systems in Illinois?

If you’re planning to install, repair, or maintain a septic system in Illinois, you might be wondering: Do you need a plumbing license for septic systems in Illinois? It’s a common—and crucial—question. Getting it wrong could mean fines, legal trouble, or even system failure. You deserve clarity, not confusion. Let’s break down exactly what Illinois law requires so you can move forward with confidence.

What Does Illinois Law Say About Septic System Licensing?

In Illinois, septic system work is primarily regulated under the Illinois Private Sewage Disposal Licensing Act (225 ILCS 225/), not the plumbing licensing statutes. This is a key distinction many homeowners and even some contractors overlook.

According to the Illinois Department of Public Health (IDPH), anyone who installs, repairs, or alters a private sewage disposal system—including septic tanks, drain fields, and related components—must hold a valid Private Sewage Disposal System Installer License. This is separate from a plumbing license issued under the Illinois Plumbing License Law.

Important: A standard plumbing license does not authorize you to work on septic systems in Illinois. Conversely, holding a septic installer license doesn’t qualify you to do indoor plumbing work like installing water heaters or fixing pipe leaks.

For authoritative background on licensing systems, see Wikipedia’s overview of occupational licensing in the U.S., which explains how states delegate authority across specialized trades.

Who Needs a Septic System License in Illinois?

Under Illinois law, the following individuals or businesses must be licensed by the IDPH:

• Contractors who design or install new septic systems
• Technicians who repair or replace drain fields or septic tanks
• Companies offering routine maintenance that involves structural changes
• Anyone submitting plans for permit approval to local health departments

Exemptions:
Homeowners may install their own septic system on property they occupy if they complete an IDPH-approved training course and obtain a permit. However, they still cannot legally do this work for others without a license.

Plumbing License vs. Septic Installer License: Key Differences

Understanding the difference can save you time, money, and legal headaches. Here’s a quick comparison:

As you can see, these are two distinct credentials with different purposes, oversight agencies, and training requirements.

How to Get a Septic System Installer License in Illinois (Step-by-Step)

If you’re planning to work professionally on septic systems, here’s exactly what you need to do:

1. Complete an IDPH-Approved Training Course
   Enroll in a state-approved course (typically 24–40 hours) covering septic design, soil evaluation, and environmental regulations. A list of approved providers is available on the IDPH website.
2. Gain Field Experience
   You must work under a licensed installer for at least 2,000 hours (roughly one full year) before applying.
3. Pass the State Exam
   The exam covers:
   • Illinois Private Sewage Disposal Code (77 Ill. Admin. Code 905)
   • Soil morphology and percolation testing
   • System sizing and layout
   • Environmental protection standards
4. Submit Your Application
   Include:
   • Proof of training and experience
   • Exam results
   • $150 application fee
   • Liability insurance documentation ($100,000 minimum)
5. Wait for Approval
   Processing typically takes 4–6 weeks. Once approved, you’ll receive your license number and wallet card.

💡 Pro Tip: Many licensed plumbers also get their septic installer license to offer full-service sanitation solutions—but they must hold both credentials.

Common Mistakes to Avoid

Even well-meaning contractors make these errors:

• Assuming a plumbing license covers septic work → It doesn’t.
• Hiring unlicensed “handymen” for septic repairs → This voids warranties and risks health hazards.
• Skipping soil testing → Illinois requires perc tests before any system design.
• Ignoring local county rules → Some counties (like Cook or DuPage) have stricter rules than state law.

According to a 2023 IDPH enforcement report, over 300 unlicensed septic installations were shut down statewide—resulting in an average $2,500 fine per violation.

Why Licensing Matters: Health, Safety, and Property Value

Septic systems handle raw sewage. If improperly installed, they can:

• Contaminate groundwater (affecting wells and rivers)
• Cause sewage backups into homes
• Lower your property’s resale value
• Trigger costly repairs ($5,000–$20,000 on average)

Licensing ensures workers understand:

• Safe setback distances from wells and property lines
• Proper tank sizing based on household size
• Drain field slope and soil compatibility

As the EPA notes, “Properly managed septic systems are effective and economical—but only when installed by qualified professionals.”

FAQ Section

Q1: Can a licensed plumber work on my septic tank in Illinois?
A: Only if they also hold a Private Sewage Disposal System Installer License from IDPH. A plumbing license alone is insufficient.

Q2: Do I need a license to pump my septic tank?
A: No. Pumping and routine cleaning are considered maintenance and do not require an installer license—though pumpers must be registered with the state and follow waste transport rules.

Q3: How much does a septic installer license cost in Illinois?
A: The initial application fee is $150, plus exam fees (~$75) and training course costs ($300–$600). Renewal every 3 years costs $100.

Q4: Can I install my own septic system as a homeowner?
A: Yes—but only on your primary residence. You must complete the IDPH training course, pass a simplified exam, and obtain a permit from your local health department.

Q5: What happens if I hire an unlicensed contractor for septic work?
A: You risk system failure, contamination, and fines. Local health departments can order removal of unpermitted systems at the homeowner’s expense.

Q6: Where can I verify a contractor’s septic license?
A: Use the IDPH’s online license lookup tool or call (217) 782-3043. Always ask for their license number before signing any contract.

Conclusion

So, do you need a plumbing license for septic systems in Illinois? The short answer: No—but you absolutely need a septic installer license (or must hire someone who does). Confusing the two could lead to serious consequences, but with the right information, you’re fully equipped to comply with the law and protect your home or business.

If you found this guide helpful, share it with a neighbor, contractor, or local Facebook group—many people still operate under outdated assumptions. And if you’re planning septic work, always verify licenses first.

Stay safe, stay compliant, and never guess when it comes to your wastewater system. 💧🏡