Definition   A black water wetland is a constructed wetland that treats wastewater through the biological processes that are normally involved in a natural wetland environment. The amount of wastewater being treated can range from a single household to a town containing over 10,000 people. (A town may necessitate as much as 1200 acres of treatment wetlands.) Aesthetically, it can be nearly identical to a natural wetland minus some treatment structures. Blackwater wetlands may be geared towards multi-use, such as parks or wildlife refuges. In the future they may be seen as much more of an amenity, as compared to just a sewage treatment center.