§ 127. ACCOUNTS OF PUBLIC UTILITIES.
The accounts of all public utilities owned and operated by the City and dependent for their revenue upon the sale of their products or service, shall be kept separate and distinct from all other accounts of the City and shall contain proportionate charges for all services performed for such utilities by other departments, as well as proportionate credits for all services rendered. The revenues derived from the operation of any public utility owned and operated by the City shall not be used for any other purpose than the operation and maintenance of that utility and the payment of the debts incurred by the city for such utility.