Selected proceedings of the 7th International Conference on Wetland Systems for Water Pollution Control, held in Lake Buena Vista, Florida, USA, 11-16 November 2000. Wetlands are now considered as a widely applicable low-cost alternative for treating municipal, industrial and agricultural effluents. Increasing numbers of wetland projects have come into operation over the last decade, notably those in Florida. IWA's 7th Wetlands conference provided a forum for the synthesis and interpretation of the current status of treatment wetlands. The conference reflected the interdisciplinary nature of the topic, with a diversity of delegates from scientific and engineering disciplines contributing. It addressed research information on current understanding of treatment wetlands, and the need to transfer basic research information to managers involved in solving applied problems; and identified future directions for design and management of treatment wetlands. From a very large programme (of over 200 oral and poster presentations), 86 papers have been selected for these proceedings. As well as authoritative keynote presentations, there are papers on: phosphorus removal and transformations; nitrogen removal and transformations; pathogen removal; optimisation and modelling; ecological considerations; subsurface flow wetlands; surface flow wetlands; industrial wastewaters; agricultural wastewaters; and stormwater. They constitute an outstanding summary of our current knowledge of wetland systems in management of the water environment.