(1)    This chapter does not prohibit the carriage, storage or handling by water carriers of freight free or at reduced rates for the United States, the state, or any municipality thereof, or for charitable purposes, or to and from fairs and expositions for exhibition thereat, or household goods the property of water carrier employees, or commodities shipped by employees for their exclusive use or consumption; or the issuance of mileage, commutation, party or excursion passengers’ tickets; or the sale of such tickets as were usually and customarily sold at reduced rates prior to June 15, 1905; provided the same are issued and sold without discrimination to all persons applying therefor under like circumstances and conditions.

   (2)   

      (a)    Water carriers may give transportation free or at reduced rates to any minister of the gospel, officers or agent of incorporated colleges, inmates of soldiers’ homes, regular agents of charitable societies when traveling upon the business of the society only, destitute and homeless persons, water carrier officers, attorneys, physicians, directors, employees or members of their families, or to former water carrier employees or members of their families where the employees have become disabled in the water carrier service, or are unable from physical disqualification to continue in the service, or to members of families of deceased water carrier employees.

      (b)    Water carriers may exchange passes with officers, attorneys, physicians or employees of other water carriers and members of their families. No person holding any public office or position under the laws of this state shall be given transportation free or at reduced rates that are not open to the public, except that notaries public and regular employees of a water carrier or other public utility who are candidates for or hold public office for which the annual compensation is not more than $300 to whom no passes or privileges are extended beyond those that are extended to other regular employees of such corporations may be granted free transportation or reduced rates for the transmission of any message or communication.

   (3)   Upon any shipment of livestock or other property of such nature as to require the care of an attendant, the water carrier may furnish to the shipper or persons designated by the shipper, free transportation for such attendant, including return passage to the point at which the shipment originated; provided, there shall be no discrimination in reference thereto.

   (4)   Except as provided in this section, no free transportation for intrastate traffic shall be given by any water carrier.