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1. Member States shall ensure that risk assessment and risk management of the supply system are carried out by the water supplier.

2. Member States shall ensure that the risk assessment of the supply system:

(a) takes into account the results of the risk assessment and risk management of the catchment areas for abstraction points carried out in accordance with Article 8;

(b) includes a description of the supply system from the abstraction point, treatment, storage and distribution of water to the point of supply; and (c) identifies the hazards and hazardous events in the supply system and includes an assessment of the risks they could pose to human health through use of water intended for human consumption, taking into consideration risks stemming from climate change, leakages and leaking pipes.

3. On the basis of the outcome of the risk assessment carried out in accordance with paragraph 2, Member States shall ensure that the following risk management measures are taken:

(a) defining and implementing control measures for the prevention and mitigation of the risks identified in the supply system that could compromise the quality of water intended for human consumption;

(b) defining and implementing control measures in the supply system in addition to the measures foreseen or taken in accordance with Article 8(4) of this Directive or Article 11(3) of Directive 2000/60/EC for the mitigation of risks coming from the catchment areas for abstraction points that could compromise the quality of water intended for human consumption;

(c) implementing a supply-specific operational monitoring programme in accordance with Article 13;

(d) ensuring that, where disinfection forms part of the preparation or distribution of water intended for human consumption, the efficiency of the disinfection applied is validated, that any contamination from disinfection by-products is kept as low as possible without compromising the disinfection, that any contamination from treatment chemicals is kept as low as possible and that any substances remaining in the water do not compromise the fulfillment of the general obligations set out in Article 4;

(e) verifying that materials, treatment chemicals and filter media that come into contact with water intended for human consumption used in the supply system comply with Articles 11 and 12.

4. On the basis of the outcome of the risk assessment of the supply system carried out in accordance with paragraph 2, Member States shall:

(a) allow the possibility of decreasing the monitoring frequency of a parameter or of removing a parameter from the list of parameters to be monitored, except for the core parameters referred to in point 1 of Part B of Annex II, if the competent authority is satisfied that to do so would not compromise the quality of water intended for human consumption:

(i) on the basis of the occurrence of a parameter in raw water, in accordance with the risk assessment of the catchment areas for abstraction points as set out in Article 8(1) and (2);

(ii) when a parameter can only occur as a result of the use of a certain treatment technique or disinfection method, and that technique or method is not used by the water supplier; or (iii) on the basis of the specifications set out in Part C of Annex II;

(b) ensure that the list of parameters to be monitored in water intended for human consumption in accordance with Article 13 is extended or that the monitoring frequency is increased:

(i) on the basis of the occurrence of a parameter in raw water, in accordance with the risk assessment of the catchment areas for abstraction points as set out in Article 8(1) and (2); or (ii) on the basis of the specifications set out in Part C of Annex II.

5. The risk assessment of the supply system shall concern parameters listed in Parts A, B and C of Annex I, parameters set in accordance with Article 5(3) and substances or compounds included in the watch list established in accordance with Article 13(8).

6. Member States may exempt water suppliers supplying between 10 and 100 m3 per day as an average or serving between 50 and 500 people from the requirement to carry out risk assessment and risk management of the supply system, provided that the competent authority is satisfied that such an exemption would not compromise the quality of water intended for human consumption. In the event of such an exemption, the exempted water suppliers shall carry out regular monitoring in accordance with Article 13.