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In the Netherlands, often only contaminated source locations are remediated, while pollution plumes keep growing as natural conditions do not always support natural (bio) degradation. Gradually, large areas will be (lightly) polluted. Traditional approaches of remediating those plumes are very costly and will cause a lot of CO2-emissions. With an alternative nature-based approach, plume remediation can be achieved in a cost-effective and energy-efficient way, by using constructed wetlands. Such biological groundwater treatment plants could be situated in green public areas. In three cases, results and costs of the implementation of constructed wetlands will be presented. With these project examples we will show that this application is a promising sustainable way of future plume remediation, which can be incorporated in urban groundwater management and other schemes of sustainable land management and land stewardship. The three case studies are briefly introduced below and will be further elucidated in final abstract and presentation.