ntr23-L_2022333EN.01014301-E0023
(23) Council Directive 91/271/EEC of 21 May 1991 concerning urban waste water treatment (OJ L 135, 30.5.1991, p. 40).
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Source: EUR-Lex (Cellar) · retrieved 2026-10-27 · Text as adopted (Official Journal); later amendments are not incorporated in this text.