(vi)
Where it is not possible to establish reliable type-specific reference conditions for a quality element in a surface water body type due to high degrees of natural variability in that element, not just as a result of seasonal variations, then that element may be excluded from the assessment of ecological status for that surface water type. In such circumstances Member States shall state the reasons for this exclusion in the river basin management plan.
National law under this provision
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Source: EUR-Lex CELLAR · retrieved 2026-08-09 · Text as consolidated on 2026-05-10; changes after this date are not shown.