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Contamination by priority substances coming from both point and diffuse source pollution is affecting less than 20% of classified lakes in most member states (Fig. 4.11.c). This impact is not well reflected in the ecological status, as the assessment systems are not developed to measure this impact. It will however be important for the chemical status. In Sweden, all the water bodies are subject to diffuse pressures of priority substances and contamination impact, mainly due to mercury in biota, but this has little impact on ecological status, although it affects chemical status. Therefore these data has been excluded from the analyses of pressures and impacts affecting ecological status.