The Rapidan Service Authority (RSA) provides water and sewer services to areas of Orange, Madison, and Greene Counties. It is a not-for-profit corporation chartered by the three counties under the laws of the Commonwealth of Virginia. There are nine (9) economically separate systems owned and managed by RSA, five (5) of which are located in Orange County. The Orange County systems are: the Route 15 water system, the Route 20 water system, the Gordonsville sewer system, and the Lake of the Woods/Wilderness water and sewer systems. The Route 15 water system supplies water, purchased from the Town of Orange, to customers along Route 15, including the Industrial Park and to the Town of Gordonsville, which then distributes the water to its residents. The Route 20 water system is the smallest system with about 150 customers and provides water from a well to customers near the Orange County Airport. The two largest systems are the water and sewer systems that service about 4,300 customers in the eastern end of Orange County. Water drawn from the Rapidan River is treated and distributed to communities and businesses along Route 3. Sewer service is also provided in this area and the sewer treatment plant returns water to the Rapidan River.