MI HB4520

Prohibits landlords from entering into rental agreements if they know or have reason to know a rental unit is infested with bedbugs, and requires landlords to maintain premises free from bedbugs.

Requires landlords to order inspections within 7 days of receiving notice of suspected bedbug infestation and to begin control measures within 7 days of confirmed infestation, employing a licensed pest management professional if treatment is necessary.

Requires tenants to maintain rental units free from bedbugs, inspect upon move-in, notify landlords within 2 days of suspected infestation, grant access for inspections and treatment, comply with control protocols, and prohibits tenants from conducting their own treatments.

Assigns financial responsibility based on causation: if a tenant or guest causes an infestation, the tenant pays control and treatment costs (considered additional rent and deductible from security deposit); if caused by the landlord, the landlord bears costs, except landlords complying with requirements are not liable except for negligence.

Preempts county and municipal ordinances that conflict with the bedbug control requirements, though municipalities may still regulate proper disposal of infested items, and the act takes effect 90 days after enactment.