The monthly fee is based on each individual District's debt for water and wastewater utility infrastructure installed by the developer for the subdivision. In these Districts, unlike in the City, developers are reimbursed by the District for these infrastructure costs through bonds issued by the District. Upon annexation by the City, the City must take over payments on these bonds which is not done for subdivisions built by developers in the City limits. The fee is different in each District because the amount of debt on this utility infrastructure is different in each district. For example, the reason the fee is higher in 1G than in 1F or Bella Vista is because 1G has approximately triple the amount of outstanding debt as the other districts; this is probably due to the way in which the original developer allocated the cost of infrastructure improvements within the districts.