After hearing, if the Sewer Commission finds that the difference
of the estimated wastewater flow from the connected property exceeds
the measured water usage by an amount which the Sewer Commission,
in its discretion, finds to be significant, it may then order that
the property owner be billed upon a wastewater flow-unit basis and
shall pay the costs of doing so. In determining whether the difference
is significant, the Sewer Commission shall consider the size of the
difference, the estimated sewer usage fees not being billed to the
property owner based upon the size of the difference, and the cost
to purchase and install the flow meter.