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This paper presents a three-stage model that applies the principles of risk assessment to the evaluation of environmental sustainability in the tourism and recreation sectors. The model uses both qualitative and quantitative data. While assessing environmental risk at and from tourism and recreation areas is fundamental to sustainable management, existing methodologies rely on sets of environmental data that are often poorly linked and difficult to interpret in a holistic manner. Risk assessment is a concept that can overcome current limitations in environmental assessment methodologies. This model demonstrates its utility by assessing the environmental sustainability of two tourism and recreation sites in Ireland, with 25 environmental hazards identified at the rural Lough Derg (Shannon River) site and 29 at the relatively urban Dublin Bay site. The results show that the practical production of holistic and representative data on environmental risk from tourism and recreation areas is possible, with water quality, amenity value, traffic and transport, boating activity and noise found particularly relevant. The strengths and limitations of the proposed model are considered and compared with three existing tourism impact models: the use of sustainability indicators and two tourism-planning frameworks, limits of acceptable change (LAC) and visitor impact management (VIM). [ABSTRACT FROM PUBLISHER]