1. Except as hereinafter provided where special rates or charges may be established, every "contributor" shall pay to the city, at the office of the city treasurer and at the same time payment is due and payable for water service supplied to  such  premises by the water distribution system owned and operated by the city, a sewer user charge computed in accordance with the schedule set forth in Section 13.08.060, exclusive of any fees, taxes or other charges.  Such sewer user charge shall be billed at the same time and in the same manner as water charges.

    2. If any premises connected directly or indirectly to the sanitary sewage system of the city obtains a part or all of the water used or consumed thereon from a source or sources of supply other than the water distribution system owned and operated by the city, the sewer user charge for such property shall be computed in accordance with the schedule set forth in Section 13.08.060 during the period for which charges shall be billed.  Sewer user charges computed as provided in this subsection shall be billed and be payable at the same time and place in the same manner as would be the case if all water used on such premises were obtained from the city water distribution system.  For the purpose of determining sewer user charges under this subsection, each contributor to the city's sanitary sewer system shall, at his own expense, cause all sources of water, other than the city's water distribution system to be properly metered and provide access to such meter or meters to authorized representatives of the city for the purpose of examination, testing and reading.  If the director approves the adequacy of such metering and the method of installation thereof, such  metering shall be used for the purpose of determining sewer user charges under this subsection.  If any contributor fails to provide such metering of water or fails to maintain any such meters in satisfactory operating condition or refuses access to the same by representatives of the city, or if the director does not approve the adequacy or method of metering, the director either:

    a. Shall cause sewage service to such premises to be terminated; or

    b. Shall cause an estimate to be made of quantities of water consumed on such premises, in which case sewer user charges shall be made in accordance with such estimate.

    3. All charges will be assessed on a minimum strength of waste equivalent to normal-strength domestic sewage.  Discharges of less than normal-strength domestic sewage will not be credited.  (Ord. S-39109, 1979).