All services shall be metered. Where electric or water meters fail to register, bills shall be computed by taking an average of the three most recent months. Where gas meters fail to register, bills shall be computed by comparison with the same month of the previous year. When, at the request of the customer or otherwise, electric, gas or water meters have been tested by the Department, or any other party approved by the Department, and found to be more than 3% fast, previous bills reflecting the inaccuracy will be adjusted accordingly, but in no case will adjustment exceed six months prior billing. If a meter is tested at the consumer’s request more than once in any six-month period, the consumer shall pay a service charge as designated by City Council from time to time as necessary for the service. In the event the meter is found to be more than 3% fast, the consumer shall have his bill adjusted as stated above, and no service charge will be applied.
(‘88 Code, § 17.207)