A biohazard can include chemical spills, water damage, a violent crime, or an unattended death on your property. For multifamily units, addressing comments or complaints from tenants relating to odor or pest issues might help uncover a biohazard issue linked to a situation like hoarding. For public institutions, such as a school, hospital, or government building, a routine OSHA inspection can uncover biohazards in a structure that will need to be remediated immediately.