Deterioration of the status of a body of water — the lowering of the status of at least one of the quality elements, within the meaning of Annex V, by one class, even if that lowering does not result in a fall in the classification of the body of water as a whole; however, if a quality element is already at the lowest class, any further deterioration of that element constitutes a deterioration of the status of the body of water.’ ‘42.

Effect-based trigger value — a threshold for the effects of a pollutant or group of pollutants in water, sediment or biota, where those effects are measured by an appropriate and scientifically validated effect-based monitoring method, above which adverse effects on human health or the environment from that pollutant or group of pollutants in water, sediment or biota, could occur.’ ‘35a.

Environmental quality standard — the concentration of a particular pollutant or group of pollutants in water, sediment or biota not to be exceeded in order to protect human health and the environment.’ ‘35.

Good surface water chemical status — the chemical status required to meet the environmental objectives for surface waters set out in Article 4(1)(a) of this Directive, that is the chemical status achieved by a body of surface water in which concentrations of pollutants exceed neither the environmental quality standards for priority substances listed in Part A of Annex I to Directive 2008/105/EC of the European Parliament and of the Council (*1) nor the environmental quality standards for river basin specific pollutants set and applied in accordance with Article 8d of that Directive, and in which effect-based trigger values, where available, are also not exceeded ‘24.

indicator of pollution — a parameter which can be monitored to give a value that is representative of the level or concentration of a pollutant or a group of pollutants and thus of the risk posed by them.’ ‘7)

indicator of pollution — a parameter which can be monitored to give a value that is representative of the level or concentration of a pollutant or a group of pollutants and thus of the risk posed by them.’ ‘(3)

Pesticides — plant protection products and biocidal products referred to in Article 2 of Regulation (EC) No 1107/2009 and in Article 3 of Regulation (EU) No 528/2012 respectively. For that parameter, Member States shall monitor the active substances present in pesticidal products currently or previously used in their territory and any found to be present as a result of transboundary pollution, and their relevant and non-relevant metabolites, degradation and reaction products, drawing, when available, on the list to be established in accordance with Article 4(2a) of this Directive. Member States may stop monitoring specific active substances and their metabolites if they are no longer being used in their territory, provided that past monitoring has consistently shown that those substances and metabolites do not occur in the groundwater body. A pesticide metabolite shall be deemed relevant if there is reason to consider that it has intrinsic properties comparable to those of the parent active substance in terms of its toxicity for the target pest or that either itself or its transformation products generate a health risk for consumers or the environment. (5) ANNEX III

Pesticides — plant protection products as referred to in Article 2 of Regulation (EC) No 1107/2009 and biocidal products as defined in Article 3 of Regulation (EU) No 528/2012. (29) The minimum performance criteria laid down in Directive 2009/90/EC apply to each individual substance within the group of substances but taking account of the need to quantify the contribution of each substance to the total concentration for comparison with the EQS. (30) With the following exceptions: the four pesticides to be monitored in biota or sediment, i.e. the substances numbered 16, 30, 34 and 44, and glyphosate. (*) Commission Regulation (EU) 2023/915 of 25 April 2023 on maximum levels for certain contaminants in food and repealing Regulation (EC) No 1881/2006 (OJ L 119, 5.5.2023, p. 103, ELI: http://data.europa.eu/eli/reg/2023/915/oj) (2)

Priority hazardous substances — priority substances which are identified as “hazardous” in accordance with the legislation referred to in Article 16(3) ‘30a.

Priority substances — substances listed in Part A of Annex I to Directive 2008/105/EC, that are substances which present a significant risk to or via the aquatic environment and are prioritised in accordance with Article 16(2) of this Directive.’ ‘30.

River basin specific pollutants — pollutants that are not or no longer identified as priority substances, but which Member States have identified, on the basis of the assessment of pressures and impacts on surface water bodies carried out in accordance with Annex II, as being discharged or deposited in significant quantities into a river basin or sub-basin and thus posing a significant risk to or via the aquatic environment within their territory.’ 30b.

threshold value — a groundwater quality standard established at Union level and listed in Annex II part D or established by Member States in accordance with Article 3(1)(b);’ ‘2)

Total — the sum of all individual pesticides detected and quantified in the monitoring procedure, including their relevant metabolites, degradation and reaction products. (6) This refers to the PFAS listed in point 3 of Part B of Annex III to Directive (EU) 2020/2184. The parameter and the quality standard shall be updated according to amendments to that Directive. (7) This refers to the following compounds, listed with their CAS number and EU number: Perfluorohexane sulfonic acid (PFHxS), (CAS 355-46-4, EU 206-587-1); Perfluorooctanesulfonic acid (PFOS) (CAS 1763-23-1, EU 217-179-8); Perfluorooctanoic acid (PFOA) (CAS 335-67-1, EU 206-397-9); Perfluorononanoic acid (PFNA) (CAS 375-95-1, EU 206-801-3). For the sum of 4 PFAS, the CAS numbers listed refer only to the protonated form of the individual PFAS but the sum applies to the total concentration of the dissolved substances including protonated and deprotonated forms and their isomers linear and branched. (8) Member States shall apply a default quality standard of 1 μg/l unless they provide reliable evidence, including from tests of acute and chronic toxicity on the taxonomic group confidently predicted to be the most sensitive, that a… ANNEX III

Water intended for human consumption — borrowed from another act; this instrument states no meaning of its own ‘37.