Council Directive of 21 May 1991 concerning urban waste water treatment (91/271/EEC)

A. Sensitive areas U.K.

A water body must be identified as a sensitive area if it falls into one of the following groups:

(a)

natural freshwater lakes, other freshwater bodies, estuaries and coastal waters which are found to be eutrophic or which in the near future may become eutrophic if protective action is not taken.

The following elements might be taken into account when considering which nutrient should be reduced by further treatment:

(i)

lakes and streams reaching lakes/reservoirs/closed bays which are found to have a poor water exchange, whereby accumulation may take place. In these areas, the removal of phosphorus should be included unless it can be demonstrated that the removal will have no effect on the level of eutrophication. Where discharges from large agglomerations are made, the removal of nitrogen may also be considered;

(ii)

estuaries, bays and other coastal waters which are found to have a poor water exchange, or which receive large quantities of nutrients. Discharges from small agglomerations are usually of minor importance in those areas, but for large agglomerations, the removal of phosphorus and/or nitrogen should be included unless it can be demonstrated that the removal will have no effect on the level of eutrophication;

(b)

surface freshwaters intended for the abstraction of drinking water which could contain more than the concentration of nitrate laid down under the relevant provisions of Council Directive 75/440/EEC of 16 June 1975 concerning the quality required of surface water intended for the abstraction of drinking water in the Member States(1) if action is not taken;

(c)

areas where further treatment than that prescribed in Article 4 of this Directive is necessary to fulfil Council Directives.

(1)

OJ No L 194, 25.7.1975, p. 26 as amended by Directive 79/869/EEC (OJ No L 271, 29.10.1979, p. 44).