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Section 2.4.5 is replaced by the following: ‘2.4.5. Interpretation and presentation of groundwater chemical status In assessing the chemical status of groundwater, the results of individual monitoring points within a groundwater body shall be aggregated for the body as a whole. The mean value of the results of monitoring at each point in the groundwater body or group of bodies shall be calculated for the following parameters: The mean values referred to in the first paragraph shall be used to demonstrate compliance with good groundwater chemical status defined by reference to the quality standards and threshold values referred to in the first paragraph. Subject to Section 2.5, Member States shall provide a map of groundwater chemical status, colour-coded as follows: Member States may provide additional maps that present the chemical status information for one or more of the following substances separately from the information for the rest of the substances identified in Directive 2006/118/EC: Member States may also present the extent of any deviation from the QS or threshold value for the substances referred to in points (a) and (b) of the first subparagraph in the river basin management plans. Member States providing such additional maps shall seek to ensure their inter-comparability at river basin and Union level. Member States shall also indicate, by a black dot on the map, those groundwater bodies which are subject to a significant and sustained upward trend in the concentrations of any pollutant resulting from the impact of human activity. Reversal of such a trend shall be indicated by a blue dot on the map. These maps shall be included in the river basin management plans.’. chemical parameters for which quality standards have been set in Annex I to Directive 2006/118/EC; chemical parameters for which national threshold values have been set pursuant to Article 3(1)(b) of Directive 2006/118/EC; chemical parameters for which Union wide threshold values have been set pursuant to Article 8(3) of Directive 2006/118/EC. | Poor: red | Good: green newly identified substances in the latest review in accordance with Article 8 of Directive 2006/118/EC; substances for which revised and stricter quality standards (QS) or threshold values are established in accordance with Article 8 of Directive 2006/118/EC.

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Source: EUR-Lex (Cellar) · retrieved 2026-10-08 · Text as adopted (Official Journal); later amendments are not incorporated in this text.