Iowa Code § 100.2: Duties of fire officials.

The chief of the fire department or the chief’s designee of every city or township in which a fire department is established or the chief of the fire department or the chief’s designee responding to every township fire where there is a contract for fire protection in effect shall investigate into the cause, origin and circumstances of every fire occurring in the city or township by which property has been destroyed or damaged or which results in bodily injury to a person, and determine whether the fire was the result of natural causes, negligence or design. The state fire marshal may assist in the investigation or may direct the investigation if the fire marshal finds it necessary.