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

Micro-organisms to be tested | Sampling plans | Limit n | c | m | M Salmonella spp. | 5 | 0 | 0 | Absence in 25 g or 25 ml Escherichia coli or enterococci | 5 | 5 | 0 | 1 000 in 1 g or 1 ml Where: n = number of samples to be tested, c = number of samples where the number of bacteria expressed in colony forming units (CFU) is between m and M, m = threshold value for the number of bacteria expressed in CFU that is considered satisfactory, M = maximum value of the number of bacteria expressed in CFU.

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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.