A total of 296 ADWs have been registered with the state. Some of these wells were closed by landowners, closed using other funds, or were deemed to be non-functioning. As of October 2007, a total of 102 ADWs have been closed using the Agricultural Drainage Well Closure Assistance Program with another 20 ADWs closures under construction. Currently, an additional 112 ADWs are operating under continued use permit from the Iowa Department of Natural Resources.
