The following measures shall be used to determine sewer charges based on water use as set forth in Section 907.04.
(a) On all premises using water exclusively supplied by the Municipality water consumption on the premises shall be measured by water meters acceptable to the Village Administrator.
(b) On the premises using water supplied either in whole or in part from sources other than the waterworks system of the Municipality, the Administrator may require the owner or other interested party to install water meters satisfactory to the Administrator to the extent necessary to measure all such supplies of water and the quantity of water consumed on the premises shall be deemed to be the aggregate amount disclosed by the meters.
(c) In the event it can be shown to the satisfaction of the Administrator with respect to any premises, that a portion of the water from any source consumed on such premises does not and cannot enter the sewer system, then in each such case, the owner or other interested party may at his expense install and maintain separate metering devices to the extent necessary to demonstrate to the satisfaction of the Administrator the portion of the water consumed on the premises which is discharged into the sewer system, and which portion shall constitute the basis for measuring the sewer charge for such premises under Section 907.04.