The Illinois Department of Public Health licenses structural pest control businesses and certifies the technicians who apply pesticides indoors and around buildings. Ask a company for its license number, then look it up in IDPH's Pest Control Business Search. Outdoor and agricultural application falls under a separate state agency.
Key takeaways
- IDPH licenses each structural pest control business location and routinely inspects those locations.
- A business holds one license per location and must employ at least one certified technician.
- Certification applies to the technician doing the indoor and building work, so ask who will come to the door.
- Outdoor and agricultural commercial application and restricted-use pesticides sit with the Illinois Department of Agriculture.
- Look the company up by its license number and confirm that the name and the location on the search match the quote.
What does IDPH actually regulate?
IDPH regulates structural pest control, which means pest work inside and around buildings. Its Division of Environmental Health licenses the business locations and inspects them, and the governing law is the Structural Pest Control Act and its administrative rules.
The Illinois Department of Public Health, through its Division of Environmental Health, licenses and routinely inspects structural pest control business locations. The point for a homeowner is that a licensed business is a location the state has checked on paper and in person, which is a different thing from a company that merely has a website and a phone line.
The governing law is the Structural Pest Control Act, found in the Illinois Compiled Statutes at 225 ILCS 235, together with the Illinois Administrative Code rules at 77 Ill. Adm. Code 830. Those two sources set out who needs a license, what a certified technician must know and what a licensed location must do. A homeowner does not need to read them to check a company, but a technician who can point to them is showing familiarity with the rules.
The license is tied to a location. A company that operates from more than one office or yard holds a license for each location, and the number printed on a quote may belong to a different address from the one serving the caller. When you check a company, confirm that the license covers the place that will do the work, not just the company name.
What is a certified technician, and why does it matter?
A certified technician has completed the state's training and certification for the work, which in Illinois covers pesticide application indoors and around buildings, including rodent and bird control. A licensed business must employ at least one certified technician.
IDPH certifies the technicians who apply pesticides indoors and around buildings. That includes rodent control and bird control, which are common calls around older houses in the south suburbs. The certification is the individual's credential, separate from the business license, and it is the person in the home who applies the product.
A business is required to employ at least one certified technician, but that does not mean the technician who arrives is certified for every task on the job. A company may send one person for an inspection and another for a treatment, or may bring in a helper. Ask who will be on site, whether that person holds the state certification and what the certification covers. The answer belongs in the written quote.
A certified technician is also the right person to ask about the method. Certification does not make a technician the best choice for every job, but it does mean the person has been trained to the state standard for the work. A homeowner can ask a technician to explain how a product is applied, where it is placed and how long the household should stay out of the room. Those answers show whether the person knows the job.
How do you look up a company in IDPH's business search?
IDPH publishes a Pest Control Business Search. Get the license number from the company, search it, and check that the name, the location and the status on the record match what you were told before any work is booked.
Start by asking the company for its IDPH license number, given for the location that will do the work. A company that hesitates to give the number, or that gives a number without a matching name, should be questioned further before a visit is booked. The number is not a secret, and a company that operates legally will have it ready.
Next, open IDPH's Pest Control Business Search and enter the number. Compare the business name, the address and the listed status with what the company told you. A mismatch can be innocent, such as an old trading name, but it is a reason to ask a question before anything is paid. Note the date you checked, the number you used and the name on the record, and keep those notes with the quote.
If the search does not return a record, do not assume the company is unlicensed. A typing error, a recent change or a different location can explain it. Ask the company to confirm the number, and if the question remains, contact the Pest Control Section of IDPH directly through the department's website. The state office can say what a record covers and whether a location is currently licensed.
| Check | What to confirm | If it does not match |
|---|---|---|
| License number | Given for the location that will do the work | Ask again, then check with the state office |
| Business name | Matches the name on the quote and the contract | Ask whether a trade name is in use |
| Address | Covers the place that will be serviced | Ask which location holds the license |
| Technician | Named or described, with the state certification | Ask who will arrive and what they are certified for |
| Scope | Written inspection, treatment and any follow-up | Do not book until the scope is written |
Where does the Illinois Department of Agriculture fit?
The Illinois Department of Agriculture handles outdoor and agricultural commercial pesticide application and restricted-use pesticides. Structural work inside and around buildings is IDPH's territory, so a company may hold a license from each agency for different jobs.
The split of responsibility can confuse a homeowner. Structural pest control is licensed by IDPH, while outdoor commercial application and agricultural work sit with the Illinois Department of Agriculture. A company that treats a lawn, a field or a commercial grounds may need an agriculture credential that is separate from its structural license. Neither credential replaces the other.
Restricted-use pesticides are a further category. They are products that carry tighter controls on who may buy and apply them, and their use is overseen by the Department of Agriculture. A technician who proposes a restricted product should be able to say why it is needed and which state rules apply to it. A homeowner should ask rather than assume.
For a homeowner, the practical question is simple. Ask whether the company holds the right credential for the work described in the quote. A company that treats the inside of a house and the yard may hold two kinds of credential, and both should be visible or stated. If the answer is unclear, ask for it in writing before the job is booked.
What about wildlife, and do local rules apply in Tinley Park?
Structural certification does not allow a technician to destroy or interfere with wildlife. Trapping or killing certain animals falls under the state's wildlife rules, which can need a permit. Local rules in Tinley Park are not confirmed here, so ask the company which rules apply to the property.
IDPH's standards manual makes a clear distinction. Structural certification does not allow a technician to destroy or interfere with wildlife. The state's Wildlife Code governs trapping and killing of certain animals, and that work generally needs a Nuisance Animal Removal Permit or a Nuisance Wildlife Control Operator. Which animals are covered, and what the fees are, are matters to confirm with the state rather than assume.
For a homeowner with an animal in the attic or the wall, the practical point is that the job may have two parts. The structural part, such as sealing entry points and treating the building, falls under structural rules. The wildlife part, such as removing an animal, may need a permit or a different operator. Ask the company how it divides the work and whether a permit is needed before anyone starts.
Local rules are a separate question. This page does not confirm an ordinance from Tinley Park or the other south-suburb villages on pests, rodents or pesticide posting. Chicago's municipal code does not apply in these suburbs, so a rule that exists in the city should not be assumed to exist in Tinley Park. Ask the company and, where the question matters, the village directly.
How should a homeowner use the license check in practice?
Treat the license check as the first step of a short routine: confirm the number, search it, match the details and keep a note. The check takes minutes and removes most of the uncertainty about whether a company is set up to do the work legally.
The routine starts with the call. When you contact a company, ask for the license number, the technician's certification and the scope of the work, and write the answers down. A company that answers those questions clearly is giving you the information you need. A company that avoids them is showing you something too.
The next step is the search, and the one after that is the quote. Check that the quote names the same business, the same address and the same technician category as the license record. A quote that describes one company and a license that belongs to another is a reason to stop and ask. The difference may be innocent, but it should be explained before any money changes hands.
Finally, keep the record. Save the license number, the date you checked it and the name on the search result with your paperwork. If a question comes up later about who did the work or what credential they held, that record answers it. You can also reach Tinley Park Pest Control at (855) 974-4733 to ask a technician what credentials apply to the work you need in Tinley Park.
Frequently asked questions
Do I have to use a licensed company for pest control in Illinois?
Structural pest control businesses are licensed by IDPH, so a company doing that work should hold a license for the location. Ask for the number and check it in the state's business search before booking.
What is the difference between a license and a certification?
The license belongs to the business location. The certification belongs to the technician. A company needs both: a license for the location and at least one certified technician on its staff.
Where do I find the Pest Control Business Search?
It is published on IDPH's website. Search by the license number the company gave you, then compare the name, address and status with the quote before you book.
What if a company cannot give me a license number?
Do not book the work until the question is resolved. A company that operates legally in structural pest control will be able to give its location's number. If it cannot, consider a different company.
Does the state license cover wildlife removal?
Structural certification does not cover destroying or interfering with wildlife. Some wildlife work needs a permit under the state's wildlife rules, so ask the company how that part of the job is handled.
This guide is general information for Cook County homeowners, not a substitute for an on-site inspection. Prices are estimates. See our disclaimer.