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What Must Landlords Do If Tenants Report Mold in Wisconsin or Illinois

  • Writer: Quality Remediation
    Quality Remediation
  • Mar 5
  • 6 min read

For landlords and property managers, few maintenance issues raise as many questions as mold. Whether you own a residential rental property or a commercial building, hearing a tenant say they suspect mold can be stressful. You may wonder what your legal responsibilities are, what steps you must take, and whether you could be liable if the problem isn’t handled correctly.


If you own property in Wisconsin or Illinois, it’s important to understand that while mold laws are somewhat limited in both states, landlords are still responsible for maintaining safe and habitable properties. Ignoring potential mold issues can lead to property damage, tenant health complaints, and even legal disputes.


Here’s what landlords should know about their responsibilities when a tenant believes mold may be present.


Landlords responsibility to their tenants if mold is suspected.

Understanding Mold in Rental Properties

Mold is a type of fungus that grows in damp environments. It commonly develops when moisture accumulates due to leaks, flooding, humidity, or poor ventilation. Mold can appear on drywall, wood, carpeting, ceiling tiles, and many other building materials.


While mold is often associated with residential housing, it can also affect commercial properties, offices, and retail spaces.


Common causes of mold growth include:

  • Roof leaks

  • Plumbing leaks

  • Flooding or water damage

  • High humidity levels

  • Poor ventilation in bathrooms or kitchens

  • HVAC system moisture problems

  • Foundation or crawlspace moisture


Because mold thrives in moist conditions, addressing the source of moisture is always the most important step in preventing mold growth.


Landlord Responsibilities Under the “Implied Warranty of Habitability”

In both Wisconsin and Illinois, landlords are required to provide tenants with a habitable living or working environment. This is known as the Implied Warranty of Habitability.

Even though neither state has detailed mold-specific laws for landlords, the warranty of habitability means landlords must maintain properties that are:

  • Structurally sound

  • Safe and sanitary

  • Free from conditions that threaten health or safety


If mold growth is severe enough to affect indoor air quality or living conditions, it could violate this standard.


That means landlords cannot simply ignore reports of mold from tenants.


Step 1: Take All Mold Complaints Seriously

When a tenant reports suspected mold, the first responsibility of a landlord is to respond promptly and document the complaint.


Tenants may notice:

  • Musty odors

  • Visible mold growth on walls or ceilings

  • Water stains or damp areas

  • Increased allergy symptoms


While not every discoloration is mold, the concern should still be investigated.

Landlords should request that the tenant provide the report in writing if possible. This helps create a clear record of the issue and when it was reported.


Step 2: Investigate the Source of Moisture

Mold cannot grow without moisture, so the next step is identifying the source of the problem.


Landlords should inspect the property for:

  • Plumbing leaks

  • Roof damage

  • Window or building envelope leaks

  • HVAC condensation

  • Flooding or water intrusion

  • Ventilation issues


In some cases, the moisture source may be related to tenant behavior, such as:

  • Not using bathroom exhaust fans

  • Blocking ventilation

  • Failing to report leaks early

  • Excessive indoor humidity


Understanding the cause of the moisture problem helps determine who may be responsible for repairs.


Step 3: Determine Whether Professional Testing or Inspection Is Needed

If mold is suspected but not clearly visible, landlords may need to consider professional mold inspection or testing.



While mold testing is not always necessary, it can be useful when:

  • Tenants claim mold is affecting their health

  • The source of mold is not obvious

  • Mold growth may be hidden inside walls or ceilings

  • A dispute arises between tenant and landlord


Professional inspectors can evaluate moisture conditions, inspect HVAC systems, and determine whether mold remediation may be necessary.


Step 4: Address Water Damage Immediately

If an inspection reveals leaks, water damage, or excess moisture, landlords must repair the underlying issue quickly.


Common repairs include:

  • Fixing plumbing leaks

  • Repairing roof damage

  • Replacing damaged drywall or flooring

  • Improving ventilation systems

  • Installing dehumidification or drainage solutions


If mold is present, simply painting over the affected area is not a solution. The underlying moisture problem must be corrected or the mold will likely return.


Step 5: Arrange for Mold Remediation When Necessary

When mold growth becomes extensive or spreads into building materials, professional mold remediation may be required.


Professional remediation companies can:

  • Identify the full extent of mold contamination

  • Contain affected areas to prevent spreading spores

  • Safely remove contaminated materials

  • Clean and treat surfaces

  • Address moisture sources to prevent recurrence


Professional remediation is particularly important in commercial buildings, multi-family properties, and situations involving larger contamination areas.



Tenant Responsibilities in Mold Situations

While landlords have maintenance responsibilities, tenants also play an important role in preventing mold.


Tenants are generally expected to:

  • Maintain reasonable cleanliness

  • Use ventilation systems properly

  • Report leaks or water damage promptly

  • Avoid creating excessive humidity in the unit

  • Allow access for inspections and repairs


If mold develops due to tenant negligence or failure to report problems early, responsibility for repairs may become more complicated.

Clear communication between landlords and tenants helps prevent misunderstandings.


The tenant has responsibilities when it comes to suspected mold issues.

Wisconsin Mold Considerations

Wisconsin does not have specific statewide mold exposure limits or detailed mold laws for landlords. However, landlords must still comply with:


Wisconsin landlords must maintain rental properties in a safe and habitable condition under the Wisconsin Administrative Code and state landlord-tenant law. These standards require landlords to repair structural issues, maintain plumbing and building systems, and address conditions that threaten tenant health or safety.


If mold creates unsafe living conditions, tenants may have the right to request repairs or pursue other remedies under state landlord-tenant law.

Because of this, it is always best for landlords to respond quickly when mold is suspected.


Illinois Mold Considerations

Illinois also does not have a comprehensive statewide mold law for rental housing. However, landlords must maintain safe and habitable properties under state and local housing regulations.


Cities such as Chicago may have additional local housing codes that address moisture and building maintenance.


Failure to address mold-related conditions could result in:

  • Local code violations

  • Tenant complaints

  • Potential legal disputes


Addressing water damage and mold concerns quickly helps landlords remain compliant with housing standards.


Why Mold Issues Should Never Be Ignored

Even small mold issues can grow into larger problems if moisture conditions continue.


Ignoring mold complaints can lead to:

  • Structural damage to building materials

  • Higher remediation costs later

  • Tenant dissatisfaction or disputes

  • Potential legal complications

  • Negative effects on indoor air quality


Early detection and prompt remediation can prevent much larger expenses down the road.


When to Call a Professional Mold Remediation Company

If tenants suspect mold or if moisture problems persist, working with a professional remediation company can help protect both the property and the landlord.


A qualified remediation team can:

  • Conduct thorough mold inspections

  • Identify hidden moisture problems

  • Provide documentation for property records

  • Perform safe and effective remediation

  • Help restore indoor air quality


Professional documentation can also be helpful if a landlord needs to demonstrate that appropriate steps were taken to address the issue.



Protecting Your Property and Your Tenants

Mold concerns can feel overwhelming for landlords, but the most important steps are straightforward:

  1. Take tenant complaints seriously

  2. Investigate moisture sources quickly

  3. Repair water damage promptly

  4. Use professional remediation services when necessary


By responding quickly and responsibly, landlords can protect their properties, maintain compliance with housing standards, and provide safe environments for tenants.


Government Resources for Landlords and Tenants

Landlord-tenant responsibilities regarding mold often fall under general housing and habitability laws rather than specific mold regulations. The following government resources provide additional guidance for property owners and tenants in Wisconsin and Illinois:


These resources outline general landlord-tenant responsibilities, housing standards, and guidance for addressing moisture issues that can lead to mold growth.


Mold Inspection and Remediation Services

If you are a landlord in Wisconsin or Illinois and your tenant suspects mold, it is important to address the issue quickly and correctly.


At Quality Remediation, our experienced team provides professional mold inspection and remediation services to help property owners identify moisture problems, remove mold safely, and restore healthy indoor environments.


Whether you manage residential rentals, multi-family properties, or commercial buildings, we can help you protect your property and your tenants.


Contact Quality Remediation today to schedule an inspection or learn more about our mold remediation services. Call 877-680-5489 or email office@qualityremediation.com.


Your trusted mold experts,

Quality Remediation

Quality Remediation mold experts in Wisconsin and Illinois.


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