Chicago Mold Removal: $984 to $2,233 + the 311 Route (2026)

The Chicago rows are Angi's Chicago guide, updated October 2025, which puts the city well below the national average. National rows for comparison.

Do this now: mold in a Chicago home

1. Stop the water. A basement backup, a flat roof that pooled, a frozen pipe or a leak from the unit above; the EPA says materials dried within 24 to 48 hours usually will not grow mold.
2. Sewage in the basement? Keep people and pets out, photograph it, and treat anything porous it touched as a loss.
3. Keep anyone with asthma or a mold allergy out of the room; the CDC says their reactions can be severe.
4. Leave the furnace or AC off if the system or ducts may be contaminated, the EPA says.
5. Renting? Report the leak and the mold to the landlord in writing. If nothing happens, the Chicago Department of Public Health says mold complaints go to 311, and a leak the landlord will not fix goes to the Department of Buildings, stating the cause of the leak.
6. Under about 10 square feet the EPA says a homeowner usually can clean it. Larger, or after sewage, call the water damage line, call your insurer, and do not sign over the claim.

Is it urgent? When Chicago mold calls for a company this week

Urgent means mold after a sewer backup or flooding, growth past the EPA's 10 square foot homeowner line, mold in the furnace or ducts, or symptoms at home: a stuffy nose, coughing, wheezing, burning eyes or a rash, the CDC's list. A small patch on bathroom caulk can be scheduled. Angi prices a Chicago basement at $338 to $2,048 and an HVAC system at $2,028 to $6,760; the basement is where most Chicago jobs start because, as Angi's guide notes, basement apartments take sewer backups and flat roofs pool water. Water still inside? Start with water damage restoration in Chicago or basement waterproofing in Chicago.

Chicago's 311 route for mold, and what Illinois does not license

Illinois has no mold license. Its Mold Remediation Registration Act (410 ILCS 105) only authorizes the state health agency to create a registration program for mold professionals, the Environmental Law Institute's 2024 compilation shows, so a Chicago company's qualifications are its training, its references and its contract, not a state card. The EPA's advice fits: hire a contractor with mold experience, check references, and ask them to follow recognized guidelines such as the EPA's own. What Chicago does have is a complaint path. The Department of Public Health's 311 flyer lists mold among the complaints it responds to, and tells renters whose landlord will not fix a water leak causing mold to file with the Department of Buildings, "stating the cause of the water leak." That wording is the key: the City enforces the leak.

Basements, old houses and the Leak Relief Program

Chicago's median home was built in 1953, and 960,739 of 1,277,054 units, 75.2%, predate 1980, with 495,715 built in 1939 or earlier, the Census Bureau's 2020 to 2024 survey shows. O'Hare's normal year brings 37.86 inches of rain on 71.6 days with 0.10 inch or more, and the city's basements take the runoff. The Department of Buildings says street catch basins carry Rainblocker restrictors so rain backs up into the street instead of basements; if yours is not working, call 311 and ask for the Water Management Leak Desk. A sewer backup after that is a sewage cleanup job before it is a mold job.

Owners of 1 to 3 unit buildings with a confirmed leak on the outdoor underground service line can use the City's Leak Relief Program, a pilot running through December 31, 2026: charges for the leak period are reduced to typical usage, once per account (312-744-4426). It does not cover indoor leaks or mold work.

Local rules, contacts and climate for Chicago, from official city, county, state, Census and NOAA pages unless the source column says otherwise.

Mold inspection in Chicago: when testing helps and when it does not

A mold inspection in Chicago runs $203 to $727, Angi's October 2025 Chicago figure; HomeGuide's national range is $300 to $650. The EPA says that if you can see mold, sampling is usually unnecessary, and that no federal limit exists for mold or spores, so a lab number cannot tell you whether a home is safe. The CDC does not recommend mold testing. An inspection earns its fee when the growth is hidden: the EPA says to suspect hidden mold when a room smells musty but you cannot see the source, with the usual spots behind drywall, inside walls around pipes, inside ductwork and above ceiling tiles. With no Illinois license, ask what training the inspector holds and whether the company also sells remediation; an inspector who will not profit from the cleanup is the better buy. More on mold inspection cost.

Questions for a Chicago mold remediation company

1. What caused the moisture, and who fixes the source before the cleanup starts?
2. How will you contain the area so spores do not spread through the house, and will you run the HVAC during the work?
3. Will you remove the materials or only clean and spray them, and what happens to insulation and drywall?
4. Illinois has no mold license: what training do your technicians hold, and does your company also sell the remediation it recommends?
5. Will you show moisture readings at the end, and who does the clearance check?

More: water damage restoration in Chicago, plumber in Chicago, basement waterproofing in Chicago, boiler repair in Chicago for a leaking boiler, black mold removal, attic mold removal, mold removal cost guide. Other cities: mold removal in Minneapolis and mold removal in Indianapolis. Calls go to an independent company that serves your area and takes this kind of job (how calls work).