The System Development Charge Calculator has been developed by the Center through funding support of the Midwest Technical Assistance Center at the University of Illinois.
System development charges (SDCs), otherwise known as impact fees, are difficult for most small systems to determine. This calculator predicts the unit cost of adding new development to an existing water system. The Calculator gives users the option of two general methodologies when determining the cost impact of new connections.
Built in Microsoft Excel, the SDC calculator also easily imports data from your capital asset inventory database (developed in CAPFinance). This data is especially important when calculating SDCs using the Equity Buy-In methodology.