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Codified version
Directive 2006/44/EC of the European Parliament and of the Council of 6 September 2006 on the quality of fresh waters needing protection or improvement in order to support fish life (Codified version) (Text with EEA relevance) · European Union

2. Dissolved oxygen (mg/l O_(2)) 50 % ≥ 9 100 % ≥ 7 50 % ≥ 9 50 % ≥ 8 100 % ≥ 5 50 % ≥ 7 Winkler's method or specific electrodes (electro-chemical method) Monthly, minimum one sample representative of low oxygen conditions of the day of sampling However, where major daily variations are suspected, a minimum of two day samples in one day shall be taken

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Source: EUR-Lex (Cellar) · retrieved 2026-10-13 · Text as adopted (Official Journal); later amendments are not incorporated in this text.