Article 15 3.

Prior regulations and specific authorisations as referred to in paragraph 2 shall be reviewed at least every ten years and, if necessary, adapted. The provisions of the specific authorisations shall be updated in the cases where the characteristics of incoming urban wastewater or the discharges from the urban wastewater treatment plant or of the receiving water body change significantly, to ensure that the requirements set out in Part B of Annex I remain fulfilled.