The first step in determining responsibility for a pest problem is to read through the lease agreement. Some tenancy agreements have a clause added regarding pest control, so in these situations, use the signed agreement as the guide. If the tenancy agreement fails to reference pest problems, we then look at the Rental Tenancies Act 1997, which is where things get a little hazy, as pest issues are not explicitly discussed. We look at the tenant’s responsibility, which states that the tenant must take reasonable care of the premises and keep the premises reasonably clean.