If, in the opinion of the Director, the wastewater did not enter the WRRF, then the City will abate the difference between the current consumption value and the average of the last two years' consumption for the same billing period. If the previous billing consumption values are unrealistic or are suspect, then the Director shall substitute representative consumption values.
If, in the opinion of the Director, the wastewater did enter the collection system, then partial abatements may be given based on the following criteria:
A. 
Billing errors. The City may issue a make-up bill for services that the user received but that were previously unbilled.
(1) 
If the make-up bill is for the service that was unbilled because of an error made by the City or Water Company or a meter failure that could not reasonably have been detected by either the City, the Water Company or the user, then the City may bill or collect for services that occurred for one year prior to the issuance of the make-up bill for a period not to exceed one year from the issuance of the make-up bill.
(2) 
If the make-up bill is for service that was previously unbilled because of unauthorized use or fraud by the user, then the City may bill for service that occurred up to 10 years before the issuance of the make-up bill.
(3) 
In all cases where actual flow data is unavailable, the Director shall estimate the water usage on historical usage, comparable facilities or engineering estimates.
B. 
Leaking fixtures. If, in the opinion of the Director, water entered the sewer system from a leaking fixture, then the Director can abate 50% of the consumption above the highest consumption value for the billing period over the previous three years.
Abatement amount = (Disputed consumption - highest consumption) X 50%
C. 
If, in the opinion of the Director, water did not enter the sewer system from a leaking fixture, then the Director can abate 100% of the consumption above the highest consumption value for the billing period over the previous three years.
Abatement amount = (Disputed consumption - highest consumption) X 100%
D. 
The abatement for leaking fixtures can occur only once every three years.
E. 
Criminal activity. If a person, other than the owner of the property, intentionally causes fixtures to discharge to the sewer system, then the Director may abate a reasonable portion of the consumption, provided that the owner:
(1) 
Prosecutes the person committing the criminal activity.
(2) 
Shows proof that a claim to the owner's insurance company was filed and denied.