Article 1 
1. This Directive concerns the quality of fresh waters and shall apply to those waters designated by the Member States as needing protection or improvement in order to support fish life. 2. This Directive shall not apply to waters in natural or artificial fish ponds used for intensive fish-farming. 3. The aim of this Directive is to protect or improve the quality of those running or standing fresh waters which support, or which, if pollution were reduced or eliminated, would become capable of supporting, fish belonging to: (a) indigenous species offering a natural diversity; (b) species the presence of which is judged desirable for water management purposes by the competent authorities of the Member States. 4. For the purposes of this Directive: (a) salmonid waters shall mean waters which support or become capable of supporting fish belonging to species such as salmon ( Salmo salar ), trout ( Salmo trutta ), grayling ( Thymallus thymallus ) and whitefish ( Coregonus ); (b) cyprinid waters shall mean waters which support or become capable of supporting fish belonging to the cyprinids ( Cyprinidae ), or other species such as pike ( Esox lucius ), perch ( Perca fluviatilis ) and eel ( Anguilla anguilla ).
Article 2 
The physical and chemical parameters applicable to the waters designated by the Member States are listed in Annex I. For the purposes of applying these parameters, waters are divided into salmonid waters and cyprinid waters.
Article 3 
1. Member States shall, for the designated waters, set values for the parameters listed in Annex I, in so far as values are listed in column G or in column I. They shall comply with the comments contained in each of these two columns. 2. Member States shall not set values less stringent than those listed in column I of Annex I and shall endeavour to respect the values in column G taking into account the principle set out in Article 8.
Article 4 
1. Member States shall designate salmonid waters and cyprinid waters and may subsequently make additional designations. 2. Member States may revise the designation of certain waters owing to factors unforeseen at the time of designation, taking into account the principle set out in Article 8.
Article 5 
Member States shall establish programmes in order to reduce pollution and to ensure that designated waters conform, within five years following designation in accordance with Article 4, to both the values set by the Member States in accordance with Article 3 and the comments contained in columns G and I of Annex I.
Article 6 
1. For the purposes of implementing Article 5, the designated waters shall be deemed to conform to this Directive if samples of such waters, taken at the minimum frequency specified in Annex I at the same sampling point and over a period of 12 months, show that they conform to both the values set by the Member States in accordance with Article 3 and the comments contained in columns G and I of Annex I, in the case of: (a) 95 % of the samples for the parameters: pH, BOD 5 , nitrites, non-ionised ammonia, total ammonium, total residual chlorine, total zinc and dissolved copper. When the sampling frequency is lower than one sample per month, both the abovementioned values and comments shall be respected for all the samples; (b) the percentages listed in Annex I for the parameters: temperature and dissolved oxygen; (c) the average concentration set for the parameter: suspended solids. 2. Instances in which the values set by Member States in accordance with Article 3 or the comments contained in columns G and I of Annex I are not respected shall not be taken into consideration in the calculation of the percentages provided for in paragraph 1 when they are the result of floods or other natural disasters.
Article 7 
1. The competent authorities in the Member States shall carry out sampling operations, the minimum frequency of which is laid down in Annex I. 2. Where the competent authority records that the quality of designated waters is appreciably higher than that which would result from the application of the values set in accordance with Article 3 and the comments contained in columns G and I of Annex I, the frequency of the sampling may be reduced. Where there is no pollution or no risk of deterioration in the quality of the waters, the competent authority concerned may decide that no sampling is necessary. 3. If sampling shows that a value set by a Member State in accordance with Article 3 or a comment contained in columns G or I of Annex I is not respected, the Member State shall establish whether this is the result of chance, a natural phenomenon or pollution and shall adopt appropriate measures. 4. The exact sampling point, the distance from this point to the nearest point where pollutants are discharged and the depth at which the samples are to be taken shall be fixed by the competent authority of each Member State on the basis of local environmental conditions in particular. 5. Certain reference methods of analysis for calculating the value of the parameters concerned are set out in Annex I. Laboratories which employ other methods shall ensure that the results obtained are equivalent or comparable to those specified in Annex I.
Article 8 
Implementation of the measures taken pursuant to this Directive may on no account lead, either directly or indirectly, to increased pollution of fresh water.
Article 9 
Member States may at any time set more stringent values for designated waters than those laid down in this Directive. They may also lay down provisions relating to parameters other than those provided for in this Directive.
Article 10 
When fresh waters cross or form national frontiers between Member States and which one of the States concerned is considering designating, the States concerned shall consult each other in order to determine the stretches of such waters to which this Directive might apply and the consequences to be drawn from the common quality objectives; these consequences shall be determined, after formal consultations, by each State concerned. The Commission may participate in these deliberations.
Article 11 
Member States may derogate from this Directive: (a) in the case of certain parameters marked (0) in Annex I, because of exceptional weather or special geographical conditions; (b) when designated waters undergo natural enrichment in certain substances, so that the values set out in Annex I are not respected. Natural enrichment means the process whereby, without human intervention, a given body of water receives from the soil certain substances contained therein. (b) when designated waters undergo natural enrichment in certain substances, so that the values set out in Annex I are not respected. Natural enrichment means the process whereby, without human intervention, a given body of water receives from the soil certain substances contained therein.
Article 12 
The Commission shall adopt measures necessary to adapt to technical and scientific progress the G values for the parameters, and the methods of analysis, set out in Annex I to this Directive. Those measures, designed to amend non-essential elements of this Directive, shall be adopted in accordance with the regulatory procedure with scrutiny referred to in Article 13(2).
Article 13 
1. The Commission shall be assisted by a committee on adaptation to technical and scientific progress, hereinafter referred to as ‘the Committee’. 2. Where reference is made to this paragraph, Article 5a(1) to (4) and Article 7 of Decision 1999/468/EC shall apply, having regard to the provisions of Article 8 thereof.
Article 14 
For the purposes of applying this Directive, Member States shall provide the Commission with information concerning: (a) the waters designated in accordance with Article 4(1), in summary form; (b) the revision of the designation of certain waters in accordance with Article 4(2); (c) the provisions laid down in order to establish new parameters in accordance with Article 9; (d) the application of the derogations from the values listed in column I of Annex I. More generally, Member States shall provide the Commission, on a reasoned request from the latter, with any information necessary for the application of this Directive.
Article 15 
At intervals of three years, and for the first time for the period 1993 to 1995 inclusive, Member States shall send information to the Commission on the implementation of this Directive, in the form of a sectoral report which shall also cover other pertinent Community Directives. The report shall be drawn up on the basis of a questionnaire or outline drafted by the Commission in accordance with the procedure referred to in Article 6 of Council Directive 91/692/EEC of 23 December 1991 standardising and rationalising reports on the implementation of certain Directives relating to the environment ( 7 ). The questionnaire or outline shall be sent to the Member States six months before the start of the period covered by the report. The report shall be sent to the Commission within nine months of the end of the three-year period covered by it. The Commission shall publish a Community report on the implementation of this Directive within nine months of receiving the reports from the Member States.
Article 16 
Member States shall communicate to the Commission the texts of the main provisions of national law which they adopt in the field governed by this Directive.
Article 17 
Directive 78/659/EEC is hereby repealed, without prejudice to the obligations of the Member States relating to the time limits for transposition into national law of the Directives set out in Part B of Annex III. References to the repealed Directive shall be construed as references to this Directive and should be read in accordance with the correlation table in Annex IV.
Article 18 
This Directive shall enter into force on the 20th day following that of its publication in the Official Journal of the European Union .
Article 19 
This Directive is addressed to the Member States.