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8. LEVELS OF CONFIDENCE
In any system for classifying the state of the environment there will inevitably be uncertainty. This may lead to some water bodies being misclassified. Some of the uncertainty will result from the limited amount of monitoring data that SEPA has been able to obtain using the new monitoring and assessment methods before the first classification results have to be produced. Over time more data will be gathered, and this will help reduce uncertainties.
Before action to improve water bodies is taken, we need to be confident that there really are adverse impacts to be addressed; and therefore where water bodies have been classified as worse than good, we need to be confident in that classification. Accordingly we expect SEPA to provide information on the confidence of its classification for each water body. This information will be important in identifying any appropriate follow-up action.
To do this, SEPA should identify the confidence of class in respect of the results for each quality element (or test in respect of groundwater classification) that was assessed in order to make the classification decision. It should define the confidence as either "high", "medium", or "low". UKTAG's report on surface water classification provides recommendations on how to determine the confidence of class and we expect SEPA to follow these recommendations.
In making an assessment of confidence, SEPA may take into account a range of sources of evidence about the impacts on a water body. Such evidence may include suitable data provided by other organisations. We would expect SEPA to develop a transparent process for demonstrating what evidence it has considered and the results of those considerations.
This assessment of confidence will inform SEPA and other regulators' decisions about where to prioritise action, in line with the principles set out in our Policy Statement, " Development of environmental standards and conditions".
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