Looking for a mold remediation or removal company in Illinois? Our directory connects you with independent, qualified mold remediation contractors across the state, organized by city so you can find a provider near you. Below the listings, this overview explains why mold is so common in Illinois, the state laws that apply, the certifications that matter, and the questions that help you choose the right company with confidence.
We publish this directory as a courtesy to Illinois property owners. We are a mold inspection and testing company — we do not perform remediation and we do not sell removal services. That separation is deliberate: it means our assessments aren’t tied to selling you a cleanup. The companies listed in this directory are independent remediation contractors, and the guidance below is meant to help you evaluate any of them with confidence.
Our Illinois directory organizes independent remediation contractors by city so you can find a mold remediation company near you.
If you’d like an unbiased assessment before you hire anyone, start with an independent mold inspection so you know exactly what you’re dealing with — and exactly what any remediation bid should address.
Mold needs only moisture, and Illinois supplies plenty of it. The state’s humid continental climate brings warm, muggy summers with highs in the 80s and dew points that keep indoor humidity elevated, followed by cold winters that turn poorly ventilated bathrooms, attics, and cold exterior walls into condensation traps. Thunderstorms deliver roughly 50–60% of the state’s annual precipitation, often in intense bursts.
How much rain a property sees varies sharply from north to south. Northern Illinois averages under 32 inches of precipitation a year, while parts of southern Illinois exceed 48 inches — so a remediation approach that fits a home in Rockford isn’t automatically right for one in Carbondale. Statewide, flooding is the single most damaging weather hazard in Illinois, and heavy-rain events have grown more frequent since the 1940s, pushing up flood peaks on rivers like the Mississippi, Illinois, Rock, and Des Plaines. Every wet basement, saturated crawl space, and flood-damaged wall cavity is a potential mold problem.
Local conditions matter, too. Across the Chicago metro, Lake Michigan increases cloud cover and humidity, and the region’s dense, older housing stock — brick two-flats, garden and basement units, and aging foundations — is especially vulnerable when heavy downpours overwhelm sewers and back water up into lower levels. In the suburbs and downstate, expansive soils, sump-pump failures, and roof or plumbing leaks are common triggers. Whatever the source, the pattern is the same: unmanaged water leads to mold, and the fix has to address the water, not just the stain.
Illinois is in the middle of an important change. The state’s Mold Remediation Registration Act (410 ILCS 105) was significantly expanded by Public Act 103-0893, effective January 1, 2025. When fully implemented, the law will require companies that provide mold remediation services in Illinois to:
The Act also requires that laboratories performing mold-confirmation testing be accredited by the American Industrial Hygiene Association (AIHA), and it directs IDPH to run a public awareness campaign about the risks of mold.
Here’s the key detail for consumers right now: these registration requirements are not yet in force. IDPH must first adopt implementing rules, and proposed rulemaking was published in the Illinois Register on October 17, 2025. Until those rules are finalized and adopted, mold remediation professionals are not yet required to register with IDPH, and there is no active statewide “mold license” you can currently look up. Fees, penalties, and the exact registration process will be set by the final rules.
One exemption is written into the law: home builders and remodelers are generally exempt when working on residential structures of four or fewer units during the written warranty period.
Because Illinois does not yet have an enforceable license to check, the burden of vetting a contractor falls on you as the property owner. The good news is that the same criteria the state is adopting — national certification, proper insurance, and accredited testing — are exactly what you can screen for today.
Illinois has no mold-specific statute for rental housing and no state law requiring landlords or sellers to disclose mold. What does apply is the implied warranty of habitability, which Illinois courts recognize in residential leases: a rental must be fit and safe to live in, and serious mold stemming from unaddressed leaks or disrepair can amount to a breach. In the City of Chicago, the Residential Landlord and Tenant Ordinance (RLTO) spells out landlords’ maintenance obligations in more detail.
Tenants dealing with persistent mold may have remedies, but Illinois self-help options such as rent withholding or “repair and deduct” carry strict notice and procedural requirements, and getting them wrong can put a tenant at risk. Whichever side of the lease you’re on, an independent inspection creates an objective, documented record of the moisture source and extent — useful for a repair request, a habitability dispute, or simply scoping the remediation. For legal steps, consult the applicable ordinance or a qualified attorney.
The recognized industry benchmark is the ANSI/IICRC S520 Standard for Professional Mold Remediation, which defines how professionals contain a work area, remove mold at the source rather than just spraying over it, protect occupants and workers, and control the underlying moisture problem. Reputable contractors also follow U.S. EPA guidance on mold cleanup. Ask any company you’re considering whether their crews are trained to and work in accordance with IICRC S520 — a confident, specific answer is a good sign.
A few questions separate qualified professionals from the rest:
Ask for current IICRC or NORMI credentials and the name of the certified technician who will oversee your job. Aligning with these bodies now also positions the contractor for compliance once IDPH registration takes effect.
This is the single most important protection for a homeowner. A company that inspects, tests, and sells the removal has a built-in incentive to find a bigger problem. Using an independent inspector — like us — for the initial assessment and, just as importantly, for post-remediation clearance testing removes that conflict of interest and gives you an unbiased confirmation that the work actually succeeded. If you’re looking for an independent mold inspection company in Illinois, visit https://moldinspectionandtest.com/illinois for more information.
It should identify the moisture source, the affected materials, the containment plan, the removal method, and how success will be verified. Mold that returns is almost always a sign the water problem was never fixed — a frequent outcome after Illinois basement backups and roof leaks when the underlying water intrusion is left uncorrected.
Ask for proof of general liability coverage and recent local references. Financial responsibility will be a legal requirement under the new law — there’s no reason to accept less today.
Costs vary with the size of the affected area, the materials involved, and how hard the moisture source is to reach. Comparing written proposals helps you spot both lowball “spray-and-pray” jobs and inflated scopes.
Use our Illinois directory and select your city to see independent, qualified mold remediation and removal companies serving your area. Before you hire, confirm the contractor holds current IICRC or NORMI certification, works to the ANSI/IICRC S520 standard, and carries appropriate insurance.
Not yet. Illinois has passed a registration law (410 ILCS 105, as amended by P.A. 103-0893) that will require mold remediation companies to register with IDPH, but it takes effect only after IDPH adopts implementing rules. As of now those rules are still pending, so there is no active statewide mold license to verify. Look for IICRC or NORMI certification instead.
The Illinois law names IICRC and NORMI as recognized certifying bodies, and IICRC’s ANSI/IICRC S520 is the leading technical standard for mold remediation. Ask any contractor to confirm current certification and S520-compliant methods.
Illinois has no mold-specific rental statute, but the implied warranty of habitability applies statewide, and in Chicago the Residential Landlord and Tenant Ordinance sets landlord maintenance duties. Serious mold caused by disrepair can breach these obligations. Tenant remedies exist but follow strict notice-and-procedure rules, so document the problem with an independent inspection and consult the ordinance or an attorney before acting.
Generally, no. Keeping inspection and testing independent from the company doing the removal avoids a conflict of interest and gives you an objective confirmation — through post-remediation clearance testing — that the job was done correctly. We provide inspection and testing only, and do not perform remediation.
Independent post-remediation verification (clearance) testing, performed by an AIHA-accredited laboratory and a party not doing the removal, is the reliable way to confirm the mold was addressed and the moisture source corrected.
This overview is provided as a general educational resource and reflects Illinois law as of August 2026. It is not legal advice, and mold regulations are actively changing as IDPH completes its rulemaking. For the current status of the Mold Remediation Registration Act, consult the Illinois Department of Public Health, and consult a qualified attorney for advice about your specific situation.
