In almost every state, landlords do have to get rid of mice. A rodent infestation is treated as a breach of the implied warranty of habitability, the legal promise built into residential leases that the home will meet basic health and safety standards for the entire lease term. Once the landlord knows about the problem, they are obligated to act. The main exception is when the tenant caused the infestation through their own conduct.
Why a Mouse Problem Is the Landlord’s Legal Responsibility
The implied warranty of habitability exists whether or not your lease mentions it, and it cannot be waived by fine print. It places two related duties on the landlord: respond to an infestation once notified, and maintain the structure of the building so pests cannot get in. That means sealing gaps around pipes, repairing foundation cracks, and fixing holes in walls or doors.
Mice qualify as a habitability issue, not a minor maintenance item, because of the health risks they create. The CDC identifies more than a dozen diseases transmitted by rodents, including hantavirus, leptospirosis, rat-bite fever, and salmonellosis.1Centers for Disease Control and Prevention. Controlling Wild Rodent Infestations Hantavirus can be contracted simply by breathing air contaminated by mouse droppings, urine, or nesting materials, and hantavirus pulmonary syndrome can be fatal.2Centers for Disease Control and Prevention. Hantavirus Prevention Mice also contaminate food and chew through electrical wiring, which creates a fire hazard. A landlord who ignores a known infestation, or lets the building deteriorate so rodents walk in, is violating the warranty.
When the Tenant Is Responsible Instead
The landlord’s duty is not absolute. If a tenant caused the infestation by letting garbage pile up, leaving food uncovered, or creating other conditions that attract rodents to an otherwise well-maintained building, the landlord can argue the tenant is liable for extermination costs.
Leases sometimes assign specific pest-related duties to the tenant: keeping the unit clean, storing food in sealed containers, reporting sightings promptly, or handling minor pest issues. Those clauses are generally enforceable for problems the tenant created, but they have a hard limit. A lease clause cannot override the implied warranty of habitability. If mice are entering through gaps in the foundation or a shared wall in a multi-unit building, that is a structural problem the landlord owns no matter what the lease says.
The practical line is this: if the problem traces to the building itself, such as old construction, unsealed entry points, or shared trash areas, the landlord is responsible. If it traces to the tenant’s behavior in an otherwise sound unit, the tenant may bear some or all of the cost.
Extra Protection in HUD-Assisted Housing
Tenants in Section 8 and other HUD-assisted housing have a stricter standard working in their favor. Under HUD’s National Standards for the Physical Inspection of Real Estate (NSPIRE), even a single sign of mice (droppings, chewed holes, urine trails, or a dead mouse) is a “moderate” health and safety deficiency that must be corrected within 30 days. An extensive infestation, meaning live mice spotted in two or more rooms or units during a daytime inspection, becomes a “severe” deficiency with a 24-hour correction deadline.3HUD.gov. NSPIRE Standard – Infestation
If the landlord does not fix the problem and the unit fails a second inspection, the housing assistance payment can be suspended entirely until the unit passes, and those payments are not made up retroactively. Tenants in HUD-insured or HUD-assisted properties can report unresolved pest problems to HUD’s Multifamily Housing Complaint Line at 1-800-685-8470, open Monday through Friday from 9 a.m. to 5 p.m. Eastern Time.4HUD.gov. Multifamily Housing – Complaint Line Serious complaints get forwarded to the appropriate regional field office.
Document the Infestation Before You Complain
You cannot enforce your rights without evidence. Start a written log the moment you notice a problem. Every mouse sighting, every pile of droppings, every gnaw mark, every scratching sound in the walls gets a dated entry noting time and exact location.
Back the log up with dated photos and video of everything: droppings in cabinets, holes chewed through food packaging, nesting material behind appliances, and any gaps or cracks in walls, floors, or baseboards that look like entry points. Then read your lease. Note anything it says about pest control responsibilities, maintenance duties, and how to submit maintenance requests. Those details shape your next step.
How to Put the Landlord on Notice
Put the complaint in writing. A phone call is fine as a courtesy, but a written notice is what builds the evidence trail if the landlord ignores you. Describe clearly what you have seen, where, and when. Reference your photos. Make a specific request for action and set a reasonable deadline.
If your lease does not specify a submission method, send the notice by certified mail with return receipt requested. The signed return receipt confirms the landlord received the letter and starts the clock. Keep copies of all of it: the letter, the certified mail receipt, and the returned receipt card.
A reasonable response window depends on severity and local law, but most tenants should see some form of action within 7 to 14 days. Live mice in multiple rooms is more urgent and can warrant a shorter deadline in your notice. If the first notice produces nothing, send a second one. Some jurisdictions require a second written notice before a tenant can pursue legal remedies.
What You Can Do if the Landlord Still Does Nothing
If written notices get no response, several options may be available depending on where you live. Each one carries real legal risk if done incorrectly, including giving the landlord grounds to start eviction proceedings. Talking to a tenant’s rights organization or an attorney before acting is worth the effort.
- Repair and deduct. You hire a licensed exterminator yourself and subtract the cost from your next rent payment. Most states that allow this require advance written notice of your intent and often cap the deductible amount.
- Rent withholding or escrow. Instead of paying the landlord, you deposit rent into a court-supervised account to show you are not simply refusing to pay. The process varies, but most states require written notice and court approval before you stop paying the landlord directly.
- Reporting to local authorities. Your local health department or housing code enforcement office can inspect the property, document the infestation officially, and order the landlord to fix it on a set timeline. An official inspection report is powerful evidence in later court proceedings.
- Lease termination. If conditions are severe enough that the unit is effectively uninhabitable and the landlord has refused to act after repeated notice, some jurisdictions let the tenant break the lease without penalty. The legal standard is high.
Retaliation Is Illegal
Many tenants hesitate to report mice because they expect the landlord to raise their rent, decline to renew, or try to evict them. The law in almost every state makes those moves illegal when they are a response to a tenant exercising legal rights, including complaining about unsafe conditions or reporting problems to a government agency.5Legal Information Institute (LII). Retaliatory Eviction
Covered retaliatory actions commonly include rent increases, service reductions, non-renewal, and eviction lawsuits without legitimate cause. Some states presume that any adverse action within a window of three to six months after a tenant’s complaint is retaliatory, shifting the burden to the landlord to prove a legitimate reason.5Legal Information Institute (LII). Retaliatory Eviction To preserve that protection, keep rent current, save copies of every complaint, and keep a clean timeline.
What Extermination Costs
Cost figures matter whether you are pushing the landlord to hire someone or weighing repair-and-deduct yourself. A standard professional mouse treatment for a typical home generally runs about $150 to $300 for the initial visit, usually covering inspection, trapping, and sealing a limited number of entry points. Severe infestations needing multiple visits, extensive exclusion work, or whole-home treatment can push costs well above $1,000. Exclusion work, meaning permanently sealing every gap and hole, is often the most expensive piece and may be billed separately at hourly rates.
If repair-and-deduct is on the table, get written estimates from licensed pest control companies before hiring anyone. The estimate documents the scope of the problem and establishes a reasonable cost figure if the landlord later challenges the deduction. Keep every receipt and the exterminator’s written report of what they found and what they did.