The Water Bureau may, upon application, issue a permit for the use of fire hydrants as a source of water for commercial enterprises or governmental agencies that have continuous need of water at various locations throughout the City. Sufficient need must be shown to preclude obtaining water from a single permanent service. The permittee shall use water exclusively for the stated purpose of the permit and shall not allow others to utilize the permit to obtain water for any other purpose. Annual fire hydrant permits are renewed for the calendar year, beginning in January. The cost for an annual permit not issued in January shall be prorated. The cost for an annual permit is set in the annual water rate ordinance.