Rychak , N.L. and Yefremova, A.A. 2025. Ecological quality standards for drinking and surface waters in Ukraine and Poland. Visnyk of V. N. Karazin Kharkiv National University. Series Еcоlogy. 33 (Dec. 2025), 33-48. DOI:https://doi.org/10.26565/1992-4259-2025-33-03.