The European Union (EU) Blue Deal has dealt with the preservation of vulnerable freshwater supplies and recommended water reclamation and reuse applications. The use of biochar is a promising technique for water treatment and reclamation. From this point of view, malt dust, which is an agro-industrial by-product of the brewery industry, was used as the feedstock of biochar for the treatment of the greywater originating from a kitchen sink and a laundry rinse cycle to obtain the reclaimed water quality. This paper mainly aimed to determine the quality of reclaimed water using biochar application. Turbidity, Biological Oxygen Demand (BOD₅), Total Suspended Solid (TSS), and E. coli analyses were performed to determine the effluent quality. According to the EU Wastewater Reclamation and Reuse Legislation, Class-A-quality reclaimed water can be used for the irrigation of all kinds of agricultural crops. Otherwise, Class-B-quality reclaimed water can be used for the irrigation of above-low-ground and high-ground crops such as tomatoes, peppers, or fruit trees. At the end of treatment, the reclaimed water met the requirement of the Class B quality according to EU legislation, considering all parameters. E. coli values met both Class A and Class B qualities for each season. Only TSS in winter met the Class A quality requirements, while the others met in the range of Class B quality. Turbidity and BOD₅ met the Class B quality criteria. In the results of the overall assessment, the effluent met the Class B reclaimed water quality considering the minimum criterion requirement. This study has verified that malt dust-derived biochar is an efficient and low-cost adsorbent to obtain reclaimed water quality. The reclaimed water was used for the green area irrigation of Osmanbey Campus in Turkey.