Deposits may be required from the customer taking service for a period of less than 30 days in an amount equal to the estimated gross bill for such temporary period plus the cost of making and discontinuing such service. Deposits may be required from any other customer who becomes habitually delinquent.
Any customer having paid a deposit shall pay bills for service as rendered, and the deposit shall not be considered as payment on account of a bill during the time the customer is receiving service.
Deposits shall be returned to the depositor when he shall have paid undisputed bills for service for a period of three consecutive years. Any customer having secured the return of a deposit will not be required to make a new deposit, unless the service has been discontinued and the customer's credit standing impaired.