The Clean Water Act set out a framework for source protection planning on a watershed basis. A watershed is an area of land that is drained by a river and its tributaries into a body of water such as a lake or river. A watershed, and the water in it, may cross township, provincial and even national boundaries. Under the Act, Source Protection Areas were established based on the watershed boundaries of Ontario’s 36 Conservation Authorities. These conservation authorities, as watershed managers, provided information that was used in the source protection planning process and worked with the Source Protection Committee to facilitate the development of Source Protection Plans. The Upper Thames River, Lower Thames Valley and St. Clair Region Conservation Authorities entered into a partnership for this region. The Thames-Sydenham and Region is made up of the watersheds of these three Conservation Authorities.