* the control measures are not economically affordable because they would
result in rates that exceed 2% of the household income of at least 20% of
the families in a service area; and
* or the control measures are not economically affordable because the annual
implementation costs, including debt service, will exceed half the annual
operating budget of the municipal utility and the municipality does not
receive a grant covering at least 75% of the costs or the permit does not
allow at least 40 years for implementation of controls.