Most property owners must follow safety and health codes and disclose any previous infestations in the lease agreement. Every state and region has different reforms that each landlord must follow. For instance, if mold growth becomes a health hazard, a landlord must remove it immediately in Florida and California. You can hire someone to conduct mold testing for black mold or for types of mold that can be problematic for a person’s physical health.  In Montana, the Mold Disclosure Act states that if a landlord or tenant detects any evidence of mold, the landlord must remove it to abide by housing codes. If the mold condition is severe, seek professional service, especially if it can potentially create hazardous conditions for tenants or the structural integrity of the rental home. Landlord responsibilities include maintaining habitable conditions for the tenants. If the property owner or landlord allows the growth of mold to become an infestation, that could be a health code violation. Landlords should respond to tenants’ mold complaints within a reasonable time period.