The objective of this study was to determine if a model could be specified that would be of use to planners when installing or expanding wellfields to provide additional water. Wells and associated equipment vary in terms of cost and complexity, depending upon capacity and depth of the well. A model was developed, dealing only with the capital costs of well installation. Parameters of the model were estimated by least squares. In terms of policy and/or planning, the model has not been adequately tested to determine its predictive value.