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Contamination by priority substances coming from both point and diffuse source pollution is affecting less than 25% of rivers in most member states, except in two member states (UK and Belgium) (Fig. 4.2.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 the impact contamination by priority substances. This is also reflected in the reporting of diffuse pressures, and is mainly due to mercury in biota. This has little impact on ecological status, although it affects chemical status. See more on this in section 5.3.2.
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You write: "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". This is misleading. It seems to assume that all the chemical status exceedances could potentially be measured as an impact on ecological status. This is not correct as there may be cases where EQS is set to protect human health or terrestrial top predators. In addition, the ecological status methods are not capable of detecting some of the effects that the EQS are suppose to protect from.