Buried Overnight: How to Tell If Your Sewer or Drain Work Is Being Done by a Licensed Company

Buried Overnight: How to Tell If Your Sewer or Drain Work Is Being Done by a Licensed Company

If you've never had sewer or drain work done before, a permit and an inspection can look like paperwork that slows the job down without changing the result.

They're not. They're the only proof that a licensed professional actually checked the work before it disappeared underground.

That distinction matters right now, especially. There is a recent pattern emerging of crews coming into the Mendota area, working nights and weekends, and getting sewer and drain jobs done without a permit or an inspection. Our owner stopped by one of these job sites and saw it firsthand: the pipe going into the ground not installed to code, already being buried before anyone licensed had a chance to look at it.

Once a trench is filled, the problem stops belonging to whoever dug it and starts belonging to you. You own the property, so you own the pipe, the violation, and the cost of doing it over.

Spotting the difference between a licensed company and one that isn't takes about five minutes.

Why This Is Happening Now

Why now? Skilled trade labor is tight right now, and licensed plumbers are often booked out weeks in advance.

That gap leaves room for crews who skip licensing and permitting entirely, since it lets them underbid legitimate contractors and take on more jobs than a permitted schedule allows. Working nights or weekends is often just a way to avoid running into a city inspector.

None of this means every low bid is a red flag, but price alone isn't a reliable way to judge who's qualified.

Why Licensed Work Matters on Buried Drain and Sewer Jobs

Every trade carries some risk, but underground sewer and drain work has three traits that make an unlicensed install especially costly.

• It hides. A bad water heater tells on itself fast; a bad sewer lateral can sit quiet for years before it surfaces as sewage in the basement or a sinking spot in the yard.
• It ties into public infrastructure, so wrong slope, wrong pipe material, or a missing cleanout affects the sewer your neighbors share, not just your house.
• It's meant to be inspected before it's covered, and that's the step these crews skip. If the trench was closed before an inspector saw it, the work was never approved.

Sewer work is plumbing under Illinois law, not excavation that happens to involve pipe. The Illinois Plumbing License Law requires it to be performed by plumbers licensed through the Illinois Department of Public Health, and it specifically covers the building sewer.

The company also needs its own registration, plus liability insurance and workers' comp. That coverage is what stands between you and the bill if someone gets hurt or the work causes damage.

In Mendota, a private sewer can only be tied into the public sewer by a State of Illinois licensed plumber, and a permit is required first. The trench can't be backfilled until the city inspects and signs off in writing.

What a Licensed Job Actually Looks Like

It helps to know what the right process looks like, not just what the wrong one does. Here's the order a licensed job follows, start to finish:

1. The permit gets pulled before any digging starts.
2. Pipe material, slope, and depth are specified in writing beforehand, not decided on the fly.
3. The crew works during normal hours and completes the installation.
4. Once the line is connected, the contractor calls the city for an inspection.
5. The city inspects the work before it's covered. Anything flagged gets corrected on the spot, not patched over later.
6. Only after written approval does the backfill happen, and the yard gets restored.

Every step in that sequence exists to catch a problem while it's still visible, which is exactly the opposite of a job that's done and buried before sunrise.

Warning Signs to Watch For Before You Hire

These are the signs that a company isn't following the process above. Any one of them is worth a second look, and more than one should stop you from hiring.

• They only work evenings or weekends, when the inspector won't be around. Legitimate crews schedule around inspections, not away from them.
• They tell you a permit isn't needed for this one. For a sewer connection in Mendota, that's flatly wrong, and if they're wrong about the permit, assume they're wrong about the code.
• They can't produce a license number on the spot. A real license number belongs on the estimate, invoice, and truck.
• The bid is far below everyone else's. Skipping permits, insurance, and bonding is a real cost advantage, and you're the one carrying the risk.
• It's cash only, there's no written scope, and there's no local address on the truck, just a magnetic sign or an out-of-area plate.
• They backfill before an inspection, or tell you it "already happened" without showing anything in writing. A sewer line that has lasted forty years can wait two days for you to verify a license.

How to Check a Plumber in About Five Minutes

Before anyone digs, a few quick checks tell you whether you're dealing with a licensed company or not.

1. Ask for the Illinois plumbing license number and the company name, in writing.
2. Look it up in the Illinois Department of Public Health's public plumber license database. Search by name, business, or number; it only returns active licenses, so if nothing comes up, you have your answer.
3. Ask for a certificate of insurance and proof of workers' compensation. If a worker is hurt on your property with no coverage, that can land on you.
4. Confirm the permit before work starts. Ask which permit is being pulled and who's pulling it, then call the Mendota City Clerk's office at 815-539-7459 to confirm it exists.
5. Ask when the inspection is scheduled. A licensed contractor will know, and will tell you they can't backfill until it clears.
6. Check the company's public reputation. A quick look at Google reviews, the Better Business Bureau, or an Angi or HomeAdvisor profile shows whether other homeowners have had consistent experiences with them over time.

What It Costs When It Goes Wrong

Non-compliant buried pipe has to be dug up and replaced, so the discount evaporates and then some.

Insurers routinely ask whether work was permitted and licensed when a claim involves sewage or water damage, which can turn coverage you counted on into a fight.

It also resurfaces at sale time. Illinois requires sellers to complete a Residential Real Property Disclosure Report, which asks about known material defects, meaning anything that would substantially affect the property's value or the safety of its occupants. Sellers only disclose what they actually know, but once a homeowner learns sewer work was done without a permit, that knowledge has to go on the report. From there, it can become a point of negotiation or grounds for a buyer to walk away.

And there's no warranty to enforce against a contractor with no bond, no insurance, and a phone number that no longer works.

Serving Mendota Since 1950

Triple Service is a third-generation, family-owned plumbing, heating, cooling, and electrical company based in Mendota, serving Ottawa, LaSalle, Peru, Princeton, Rochelle, Amboy, and Dixon. Illinois plumbing license #058-144742.

We pull permits, we wait for inspections, and we put our license number on our paperwork, because that's the job.

If you've had sewer or drain work done recently and aren't sure it was permitted or inspected, we can run a camera down the line and show you what's actually down there, whether that points toward a sewer line repair, a trenchless fix, or nothing at all. If you're collecting quotes right now, ask us the questions above.

Call or book an appointment online.

Frequently Asked Questions

Does sewer line work require a licensed plumber in Illinois?

Yes. Illinois law treats the building sewer as part of your plumbing system, so it has to be handled by an IDPH-licensed plumber. In Mendota, connecting a private sewer to the public sewer legally requires a State of Illinois licensed plumber.

How do I verify a plumber is licensed in Illinois?

The Illinois Department of Public Health maintains a public database searchable by name, business, or license number. It only shows active licenses, so if a name doesn't come up, that's your answer.

Can a homeowner do their own sewer work in Illinois?

There's a narrow exemption for an owner-occupant of a single-family home who lives there as their sole residence, plans to stay at least six months after the work is done, follows the state plumbing code, pulls the required permits, and uses no unlicensed help. It doesn't apply to rentals, investment properties, or multi-family buildings.

What should I do if unpermitted work was already done at my home?

Have a licensed plumber inspect the line. A camera inspection shows the pipe's condition, slope, joints, and material, so you can decide what to correct and talk to the city about compliance. The cost usually falls to the property owner, so it's better to know now than during a claim or a sale.