Since 2003 the waste water from the town of Trosa (about 4500 citizens) has been treated in artificial wetlands, after the basic treatment in the sewage plant. Thanks to the wetlands the Trosa river and the town bay have been spared from eutrophicating substances (plant nutrients) as well as contagious substances (pathogenes). Besides the value of purifying the water, the wetlands are a popular recreation area. The wetlands are used for education and many study visits are made here.
Independent Environmental Consultants, Inc. (IEC) is a company which specializes in wetlands consulting - coastal and freshwater wetlands. IEC has worked on numerous environmental projects throughout Massachusetts, Rhode Island, and Connecticut. IEC has provided environmental consulting services to both the public and private sectors since 1986.