The Madrona Water Service Area was established in 1973 and comprises an area located mainly between Northwest Bay Road and Madrona Point on the Nanoose Peninsula. During the winter months the water source for the Madrona Water Service Area comes from three groundwater wells located nearby. The Madrona Water Service Area is supplemented, when required, with water from the Fairwinds water system. From May to October each year, the water source to Madrona is replaced by surface water from the Englishman River. The water supply is chlorinated. Both the groundwater and surface water sources are stored in one reservoir.