The Lake Poinsett Association (LPA) is a non-profit corporation ran by an all volunteer board of approximately ten members that is funded entirely by membership dues and business sponsors. It was started by a group of concerned lake residents in 1964 that is dedicated to preserving the health and beauty of Lake Poinsett for future generations. The current LPA Board works to promote healthy lake awareness and action through education, social activities, publications, social media outreach and water quality monitoring. The LPA meets the first Saturday, in person, the months of April through October and online the months of November through March, with an annual meeting in August.

​The Lake Poinsett Water Project District (LPWPD) is a political subdivision of the State of South Dakota that was formed in 1989. It includes all land within 1,000 feet of the ordinary high water mark of Lake Poinsett, which is 1,651.5. The seven member Board raises funds for lake projects, such as shoreline restoration and cleaning out Lake Poinsett's outlet. They also work with other local government agencies to mitigate the pollution of the Lake Poinsett Watershed. The LPWPD meets the third Saturday of the months of April through October at 9 A.M. with an annual meeting in April.
 
The Lake Poinsett Sanitary District (LPSD) is also a political subdivision the the State of South Dakota that was incorporated in December of 1975 and also includes all land within 1,000 feet of Lake Poinsett's ordinary high water mark of 1,651.5. The five member Board works to maintain a sanitary sewer system to protect the water quality of Lake Poinsett. They meet the second Saturday of every month at 8:00 A.M. The LPSD maintains and operates sanitary sewer services around the entire lake except for Northwest Lake Drive and Prairie Quay Drive and a portion of West Lake Drive and Sunset Park Drive. The sanitary sewer system consists of gravity and pressure mainlines, where some lake drives still incorporate the use of septic tanks while other portions do not. There are also 20 lift stations and 5 lagoons. The LPSD also organizes the garbage and recycling service and a lake wide cleanup in June.