A greywater marsh is a constructed wetland for greywater treatment. Although it is artificial, it mimics a natural wetland and attracts birds, fish, insects, etc., as well as growing plants, all while treating wastewater and acting as a biofilter for removing pollutants from water.
Greywater marshes or constructed wetlands are often put in place where land has been damaged or impacted by industrial activities such as mining, dumping, building works, etc. The constructed wetland may also be created as a solution to water or subsidence problems that arise after natural disasters, such as liquefaction caused by earthquakes making areas uninhabitable for human residences but useful as wetlands that control water flow and runoff.
