Except as otherwise provided in section 331.385, the trustees of each township shall provide fire protection service for the township, exclusive of any part of the township within a benefited fire district and may provide emergency medical service. The trustees may purchase, own, rent, or maintain fire protection service or emergency medical service apparatus or equipment or both kinds of apparatus or equipment and provide housing for the equipment. The trustees of a township which is located within a county having a population of three hundred thousand or more may also establish and maintain an emergency warning system within the township. The trustees may contract with a public or private agency under chapter 28E for the purpose of providing any service or system required or authorized under this section.