Water Reuse Regulation (EU) 2020/741 on minimum requirements for water reuse.

https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32020R0741&from=EN

'reclaimed water’ means urban waste water that has been treated in compliance with the requirements set out in Directive 91/271/EEC and which results from further treatment in a reclamation facility in accordance with Section 2 of Annex I to this Regulation (EU) 2020/741 on minimum requirements for water reuse.

also:

reclaimed water which is obtained from waste water that has been collected in collecting systems, that has been treated in urban waste water treatment plants in accordance with Directive 91/271/EEC and that undergoes further treatment, either in the urban waste water treatment plant or in a reclamation facility, in order to meet the parameters set out in Annex I to this Regulation (EU) 2020/741.

This Regulation should not concern biodegradable industrial waste water from plants belonging to the industrial sectors listed in Annex III to Directive 91/271/EEC, unless the waste water from those plants enters a collecting system and is subject to treatment in an urban waste water treatment plant.

From Annex III

1 . Milk-processing
2. Manufacture of fruit and vegetable products
3. Manufacture and bottling of soft drinks
4. Potato-processing
5. Meat industry
6. Breweries
7. Production of alcohol and alcoholic beverages
8 . Manufacture of animal feed from plant products
9. Manufacture of gelatine and of glue from hides, skin and bones
10. Malt-houses
11 . Fish-processing industry