The city council may contract with large-volume master metered customers regarding sharing the capital and operational costs of water filtration. For all customers receiving filtered water who are not participating in the costs of water filtrations, there shall be added to current rate and charges for water service a charge to be identified as “filtration charge.” In the event of nonpayment of the filtration charge for any reason, water service to customers not paying current metered ordinance rates shall be cut off at the earliest possible time consistent with the city’s legal obligations and shall not be commenced until all charges assessed herein have been paid in full, plus interest of twelve percent on the annual outstanding indebtedness. (Ord. 1237-86 § 72, 1986.)