All properties within approximately 1000' of the shoreline are part of the Big Cedar Lake Preservation and Rehabilitation District. The lake district is a governmental body with elected and appointed leaders and an annual budget funded from tax levies or special assessments.
You can check the Washington County GIS program. Search for the address or owner, and in the pop up, scroll down and click on Tax Assessment. Select a recent tax bill. If Big Cedar PR & Reh is listed, then the property is part of the district.