(b)

Council Directive 91/676/EEC of 12 December 1991 concerning the protection of waters against pollution caused by nitrates from agricultural sources · European Union

repeat the monitoring programme outlined in (a) at least every four years, except for those sampling stations where the nitrate concentration in all previous samples has been below 25 mg/l and no new factor likely to increase the nitrage content has appeared, in which case the monitoring programme need be repeated only every eight years;

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Source: EUR-Lex CELLAR · retrieved 2026-08-09 · Text as consolidated on 2026-03-02; changes after this date are not shown.